The advantage to performing the reaction in methyl ethyl ketone - a solvent with a high boiling point is to carry the reaction in the forward direction by refluxing the set.
What is boiling point?Boiling point is defined as the bulk phenomenon. It is the temperature at which the pressure of atmosphere is equal to the pressure of the vapour or vapour pressure.
Since, high boiling point solvent are used during the procedure to reflux the set which help in carrying out the reaction in the forward direction. If we had used low boiling point solvent instead of high all of the solvent evaporated and refluxing of the mixture of reaction to get product for maximum production could not have been possible.
Thus, we concluded that the advantage to performing the reaction in methyl ethyl ketone - a solvent with a high boiling point is to carry the reaction in the forward direction by refluxing the set.
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What is the heat capacity of 185g of liquid water?
The heat capacity of 185g of liquid water is 4.421 J/g°C
Heat capacity is defined as the amount of heat energy required to raise the temperature of a given quantity of matter by one degree Celsius
Here given data is
Mass = 185g
We have to calculate the heat capacity = ?
So the formula is
q = m×c×ΔT
c = ?
q = 4.184 J
m = 185g
ΔT = 100°C
c = m× ΔT/q
c = 185g ×100°C/ 4.184 J
c = 4.421 J/g°C
Heat capacity of 185g of liquid water is 4.421 J/g°C
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the greater the lattice energy, the greater the charges on the participatory ions and the smaller their radii. the greater the lattice energy, the greater the charges on the participatory ions and the smaller their radii. true false
True, the greater the lattice energy, the greater the charges on the participatory ions and the smaller their radii.
Lattice energy is the term used to describe the energy created when two gaseous ions with opposing charges are drawn to one another and eventually form an ionic bond.
Due to the tight bonding of ionic bonds, lattice energy is always positive and typically has a brittle crystalline structure.
They are not easily deformed due to the presence of a strong electrical link, and because of the arrangement of ions, they melt at a very high temperature.
As lattice energy rises, ionic bond strength rises as well. Additionally, the size or radius of the ions as well as the charge of the ions affect the lattice energy.
The radius of the Ion: The lattice energy decreases as the ion radius rises. The lattice energy reduces as the halide size grows down the group. This is due to the fact that when ions become larger, their nuclei become farther apart. As a result, there is less attraction between them, which ultimately results in less lattice energy being produced.Charge of ions: Due to the ions' stronger attraction to one another, lattice energy rises as ion charge increases. In comparison to +1 or -1 ions, +2 or -2 ions will therefore release more lattice energy.Learn more about the lattice energy here:
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Compare and contrast metallic and ionic bonds, including the element groups they are made of, the behavior of electrons, and their typical properties.
The Compare and contrast of metallic and ionic bonds is given below.
Ionic and metallic bonds take occur between positive and negative ions, whereas ionic bonds take place between positive ions and electrons. This is the main distinction between the two types of bonds.
Ions, which are made up of a positive and a negative ion, are created when two atoms exchange electrons. Atoms sharing electrons to form a molecule result in covalent bonds. Metal atoms shed their outermost electron to produce positively charged ions, which then form metallic bonds.
Metal ions are attracted to delocalized or free e, forming metallic connections as a result. whereas ionic bonds are created by electron transfer from one atom to another.
What is the similarity between metallic and ionic bonds?Similar to ionic bonds, where the removal of electrons results in the formation of ions, metallic bonds include the removal of electrons to create a sea of electrons.
Later, these electrons are used or shared by each and every atom, and in covalent bonds, two atoms share one electron. Consequently, metallic bonds resemble both ionic and covalent bonds.
Ionic and metallic solids differ significantly in that metallic solids contain metal atoms and free electrons while ionic solids mostly comprise cations and anions.
Additionally, metallic solids feature metallic bonds rather than the electrostatic attraction forces between cations and anions that exist in ionic solids.
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The specific heat of liquid ethanol, c2h5oh(l), is 2. 46 j/g·°c and the heat of vaporization is 39. 3 kj/mol. The boiling point of ethanol is 78. 3 °c. What amount of enthalpy is required to heat 50. 0 g of liquid ethanol from 23. 0 °c to ethanol vapor at 78. 3 °c?.
The enthalpy required to heat 50 g of liquid ethanol from 23 °C to ethanol vapor at 78.3 °C is 50. kJ.
We want to heat 50 g of liquid ethanol from 23 °C to ethanol vapor at 78.3 °C. We can divide this process in 2 parts:
Heating of liquid ethanol from 23 °C to 78.3 °C (boiling point).
Vaporization of ethanol at 78.3 °C.
1. Heating of liquid ethanol from 23 °C to 78.3 °C
The amount of heat required for this part (Q₁),
Q₁ = c × m × ΔT
Q₁ = (2.46 J/g °C) × 50 g × (78.3 °C - 23 °C) × (1 kJ/1000 J) = 6.8 kJ
where,
c = specific heat of liquid ethanol.
m = mass of ethanol.
ΔT = change in the temperature.
2. Vaporization of ethanol at 78.3 °C.
The amount of heat required for this part (Q₂),
Q₂ = (m/M) × ΔH°vap
Q₂ = [50 g/(46.07g/mol] × (39.3 kJ/mol) = 43 kJ
where,
m = mass of ethanol.
M = molar mass of ethanol.
ΔH°vap = enthalpy of vaporization of ethanol.
The total amount of heat required (Q) = the sum of the heat required in each step.
Q = Q₁ + Q₂ = 6.8 kJ + 43 kJ = 50. kJ
Let the process is carried out at constant pressure and the enthalpy required for the process = 50. kJ.
The enthalpy required to heat 50 g of liquid ethanol from 23 °C to ethanol vapor at 78.3 °C is 50. kJ.
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Arrange the following solutions by increasing chloride ion molarity.
a. 1 M NaCl
b. 1 M FeCl3
c. 5 M NaCl
d. 1 M CaCl2
e. 2 M FeCl3
f. 2 M CaCl2
Arrangement of the solution By increasing order of molarity, is
option (a) < option (d) < option (b) < option (f) < option (c) < option (e)
Molarity is the amount of a substance in a certain volume of a solution. It is expressed as mole of the solute per liter of the solution. It is also known as molar concentration of the solution.
1M NaCl has, (1M Nacl/1L) . (1 molcl/1 mol) =1M.so the molarity of the Nacl is 1M.
1M FeCl3 have, ( 1M FeCl3 /1L ). (3 mol Cl /1 mol) = 3M. So. the molarity of the 1M Fecl3 is 3M.
5 m Nacl has, (5m Nacl/1l) . (1 mol cl/1 mole) =5M it has the molariry of 5M.
1M Cacl2 has, (1M Cacl2/1L) . (2mol cl/1 mole) = 2 mol. so it has the molarity of 2M.
2M Fecl3 has, (2M Fecl3 /1L) . (3mol cl/1 mole) = 6M. it has the molarity of 6M.
2M Cacl2 has, (2M Cacl2/1L) . (2mol cl /1 mole)=4M.The molar concentration of this is 4M.
hence, the solutions are arranged in increasing order.
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If metals and non-metals make bonds and non-metals and non-metals make bonds, can metals and metals do the same? how?
ASAP PLEASE
Answer:
Yes
Explanation:
Metals can bond with each other, both on a macroscopic level and on a molecular level. The former is found in any piece of metal, which is held together by metallic bonding. This can be more than one metal in the case of alloys, which are an intimate mixture of two or more different metals.
A solution was found to have a 15. 6 % transmittance at 500 nm, its wavelength of maximum absorption, using a cell with a path length of 5. 00 cm. Calculate the absorbance of the solution in a 1. 00 cm cell at 500 nm.
The correct answer is 0.161.
Solution:
Percentage transmission (%T) of the sample = 15.6
Therefore, Absorbance (A) 2 – log (%T) = 2 – log (15.6) = 0.8069
Use Beer’s law:
A = ε*c*l where ε = molar absorptivity of the solution, c = concentration of the solution, and l = path length of the solution.
Given A = 0.8069 and l = 5.00 cm, we must have
0.8069 = ε*c*(5.00 cm)
ε*c = 0.16138 cm-1
For the next part, assume that ε*c remains constant and we have
A’ = ε*c*l’ where l = 1.00 cm.
Plug in values and write
A’ = (0.16138 cm-1)*(1.00 cm) = 0.16138
Absorption measures the amount of light of a particular wavelength that a particular substance blocks from passing. The two main factors that affect absorption are substance concentration and optical path length. The net Absorption Rate is calculated using the formula of the total vacant area at the beginning of the period plus square feet.
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13.67 a mizture of methane and 200% of the theoretical air, initially at 77 f, 1 atm, reacts completely in an insulated vessel. determine the temperature in f of the combustion products if the reaction occurs a) at constant volume, b) at constant pressure in a piston-cylinder assembly
The temperature at constant volume is 0.311, The temperature at constant pressure is 5.133.
What is mixture?
A mixture in chemistry is a compound composed of two or more chemical components that are not chemically linked. A mixture is a physical combination of two or more substances that retain their identities and are blended as solutions, suspensions, or colloids.
GIVEN :
Air = 200%
p = 77f, 1 atm
PV=nRT
1*200/100 = 12(77)T
= 0.3311
1*80/100 = 12(77)T
= 5.133
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Does an increase in the number of electrons around the nucleus of an atom always increase the size of the atom?
Answer: The radius of atoms increases as you move down a particular group in the periodic table of elements because an atom grows larger as the number of electronic shells increases.
Explanation:
https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/Atomic_and_Molecular_Properties/Atomic_Radii
if 2 molecules of ch4 react with 5 molecules of o2 , determine the number of molecules of co2 that could form from each starting material.
The moles of CO₂ that can be formed from each reactant are:
2 moles of methane = 2 moles of CO₂5 moles of O₂ = 2.5 moles of CO₂What is the equation of the combustion of methane?
The equation of the combustion of methane is given below as follows:
CH₄ (g) + 2 O₂ (g) ---> CO₂ (g) + 2 H₂O (g)
From the equation of the reaction, 1 mole of methane reacts with 2 moles of oxygen to produce 1 mole of carbon dioxide ad 2 moles of water.
Given that there are 2 molecules of CH₄ reacting with 5 molecules of O₂. the moles of CO₂ that can be formed from each reactant are determined from the mole ratio of the reactants and products as given in the equation of the reaction.
2 moles of methane will produce 2 moles of CO₂
5 moles of O₂ will produce 5 * 1/2 moles of CO₂ = 2.5 moles of CO₂
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ethylene glycol, the substance used in automobile antifreeze, is composed of 38.7% c, 9.7% h, and 51.6% o by mass. its molar mass is 62.1 g/mol. determine both the empirical and molecular formula of ethylene glycol.
Like all automotive antifreeze compounds, they are 38.7% carbon. So carbon is 38.7 9.7% hydrogen, 9.7 hydrogen and 51.6% oxygen. all right. Ah 1500 6% oxygen. yes. all right. Next, we need to empirically find molecular phone lines emitted from the ground.
Well, first of all, yes there are more. We have the atomic weight of carbon. 1201 Oxygen 16. The process divides each percentage by the fractional mass by 50%. So divided by 3 good points to find 38.7. This is 9.7 divided by 1, which is 9.7, and 51.6 divided by 16, which is 5157 divided by 16. I want to believe all right. The next step is to share each. youngest age. The minimum he is 3.225. If you're sharing now, we're sharing 3.225 times 3.225 is one 9.7 x 3.225. Approximately 3 and 3.225 divided by 3.225. So we have an empirical formula where carbon is 1, hydrogen is 3, and oxygen is 1. See below for 3. A small amount of Italian black hole was given. First find the molecular formula. The empirical mass is 2, 3, 16, which is 12 plus 1. So 15 plus 7 30 from g Berman. This is the molecular formula of the molecule. Therefore, we can find the sector of the mass of the molecular formula divided by the mass of the empirical formula. Remember that we are using this subdivision. Thus, for molecular and larger LAMAs.
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12 g of magnesium ribbon was heated in a crucible. At the end of the reaction 20 g of magnesium oxide had been produced. What mass of oxygen had reacted with the magnesium?.
The mass of oxygen reacted with magnesium is 8 grams.
The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms that are present in a compound. This is generally used for compounds which do not contain discrete molecules, and ions as their constituent units.
The combustion reaction of magnesium is as follows
2Mg + 02 + heat → 2MgO
Molar mass of MgO = 24.32 g/mol
Mole of Mg in 12g = 12 ÷ 24.32 = 0.4934 mol
From the balanced reaction we can see that the mole ratio of Mg to O2 is 2:1.
Therefore for 0.4934 mol of Mg, mole of 02 required will be = 1/2 × 0.4934 = 0.2467 mol.
Molar mass of O2 = 32g/mol
Hence the mass of O2 required = 0.2467 × 32 = 7.89g
By the conservation of mass; Mg + Oxygen = MgO
Mass of Mg = 12g
Mass of MgO = 20G
Therefore the mass of oxygen reacted with Mg will be = (20-12) = 8 grams
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Predict the products of the reactions, then balance the equation and identify the type of reaction.
(48 points: 8 points each= 2 points for reaction type, 4 points for products, 2 points for coefficients)
a. ___C3H8 + ___O2 → Reaction Type:
b. ___Ca + ___ Mg(NO3)2 → Reaction Type:
c. ___KOH + ___ HBr → Reaction Type:
d. ___Na + ___ O2 → Reaction Type:
e. ___ MgO → Reaction Type:
f. ___ K + ___Cl2 → Reaction Type:
The balanced equation of the reaction and the reaction types are given below as follows:
a. C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O Reaction Type: Combustion
b. Ca + Mg(NO₃)₂ → Mg + Ca(NO₃)₂ Reaction Type: Single replacement
d. 4 Na + O₂ → 2 Na₂O Reaction Type: Oxidation or combination
e. 2 MgO → 2 Mg + O₂ Reaction Type: Decomposition
f. 2 K + Cl₂ → 2 KClReaction Type: Synthesis
What are chemical reactions?Chemical reactions are reactions in which chemical changes occur in one or more substances resulting in the formation of new substances.
Chemical changes that occur during chemical reactions are not easily reversible.
There are several types of chemical reactions and they include the following:
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Why are the products of an exothermic reaction likely to be warmer than the reactants?.
The products of an exothermic reaction likely to be warmer than the reactants because in this reaction energy produced is released as heat.
An exothermic reaction is a reaction in which energy is released in the form of light or heat. So, in an exothermic reaction, energy is transferred into the surroundings rather than taking energy from the surroundings as in the case of endothermic reaction.
We can also say that the exothermic reactions are the ones that actually release heat after the chemical reactions. For example matching a light using a matchstick is one example of this type of reaction where the release of energy is in the form of both heat and light.
So, in these kinds of reaction the products of these reactions are more likely to me warmer than the reactants.
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WILL GIVE BRAINLIEST!! (Just learned how)
The measured bond energies (kJ/mol) of several compounds was determined to be A = 350, B = 500, C = 180, and D = 1,450. Which compound will most likely conduct electricity when dissolved in water?
A. compound A
B. compound C
C. compound B
D. compound D
Answer:
D) Compound D
Explanation:
The bond energy is the highest amount the listed bond energies and this is one of the characteristics of ionic compound because usually its involves the formation of anions and cations with the former being negative and the latter being positive.
The bond is usually strong because it is involves attraction between actions and anions. It requires transfer of electron between metals and nonmetals. The metals are usually the cations (lose electron) and nonmetals are usually the anions ( they gain electron) so when they are dissolve in water they dissociate into negative and positive ions and carries electrical charges while in solid form they are insulators example is NaCl
Answer:
Compound D
Explanation:
10. challenge question 2: a few small drops of water are left in a buret that is then used to titrate a base into an acid solution to determine the concentration of the acid. will this small amount of water have any effect on the determined value for the concentration of the acid? if so, how is it affected?
Yes, this small amount of water will have effect on the determined value for the concentration of the acid.
How small amount of water affect concentration of acid?Even small amount of water causes an error because the drops of water add to the volume of base, diluting it slightly. This means it will take more base solution to neutralize the acid. This makes it seem as if the acidic solution was of stronger concentration than it actually was.
Method of quantitative analysis for determining the concentration of an acid or base by neutralizing it exactly with a standard solution of base or acid having known concentration is known as an acid–base titration
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A student makes a model of a cell. He uses a plastic bag to represent the cell membrane. He fills it with a clear gel to represent the cytoplasm. He puts in other materials to represent parts of the cell within the cell membrane. His teacher tells him that the plastic bag is not a good representation of the cell membrane. She suggests that the student find a material that better shows how a cell membrane works. The student makes another model using a woven cloth bag to represent the cell membrane. The teacher tells him that he made a good choice. Why is the woven cloth a good choice for improving the student’s cell model?
The woven cloth is a good choice for modeling a cell membrane because cell membranes are semipermeable, which means some particles can cross the cell membrane while others cannot. Unlike the plastic bag, the woven cloth is semipermeable: for the woven cloth, small particles/liquids can pass through it while larger objects cannot. However, nothing is able to pass through the plastic bag, so the plastic bag is not semipermeable (it's impermeable).
help me please write the correct formula
The formulas of each of the compounds are;
1) AlN
2) [tex]NH_{4} ^+[/tex]
3) [tex]C_{3} H_{8}[/tex]
What is a chemical formula?The term chemical formula has to do with the representation of a compound. We know that the way that a compound is represented would help us to be able to identify the compound.
We have various compounds that have been shown in the image and we are asked to find the correct formula of the compound. We now look at the number of atoms that we have in each of the diagrams and by means of the number of atoms, we would look to see how we can be able to find the chemical formula of the compound.
By the octet rule, aluminum can combine with nitrogen to form aluminum nitride. The combination of nitrogen with four hydrogen atoms would only lead to the formation of a charged ammonium specie. A structure that contains three carbon atoms and eight hydrogen atoms can only be propane as shown.
Thus, when we see the arrangement of the atoms we now have to look at the possible compound that could be found from the arrangement shown and then write down the formula of the compound as shown.
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Describe the temperature, moisture and air pressure associated with a Maritime Tropical air mass.
Answer:
it is damp moist and other things
Explanation:
draw the lewis structure for pcl6, then answer the following questions: 1. how many valence electrons does this compound have? 2. how many bonded electrons does this compound have? 3. how many lone pairs of electrons does this compound have? 4. how many single bonds does this compound have? 5. how many double bonds does this compound have? 6. what is the electron group arrangement {aka electron pair geometry} (enter one of the following: linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral)? 7. what is the molecular geometry {aka shape} (enter one of the following: linear, trigonal planar, tetrahedral, trigonal pyramidal, bent, trigonal bipyramidal, seesaw, t-shaped, octahedral, square pyramidal, square planar)?
The Pcl6 has 48 bonded electrons and 18 lone pairs.
The Lewis structure of Pcl6 is as follows: -
Phosphorous is bonded with 6 chlorine atoms with 18 lone pairs.
Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule. [1][2][3] A Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds.
In Lewis structure, atoms are bonded with single bonds. If total number of electrons are 't' and number of bonds are 'n', then t-2n number of electrons are to be placed. Once the central atom is placed, they need to complete the octet rule.
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Rank the following species by radius, from largest to smallest:
cl−, k , ca2, ar, s2−.
The rank of the species by radius from largest to smallest: [tex]S^{2-} > Cl^{-} > Ar > K^{+} > Ca^{2+}[/tex]
All Ions are isoelectronic, which means the elements can have the same number of electrons but, their radii would be different because they have different nuclear charges. Atomic radii can be predicted easily. The atomic radii in the periodic table increase from top to bottom coming from left to right.
The cation with a greater positive charge will have a small radius due to the great attraction of electrons. The Anion with a greater negative charge will have a large radius due to the less attraction of electrons. Therefore, the ion will expand in size due to the net repulsion of the electrons.
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g in quasi-chemical theory of solutions, the enthalpy of mixing of the system can be expressed calculate the fraction of b (xb) in the system
In quasi-chemical theory of solutions, the enthalpy of mixing of the system can be expressed, the fraction of B (Xb) in the system will be 0.0729
ΔH = XaXb (7500 Xa + 18200 Xb)
Bond energies are as:
eaa = -6.5 × 10⁻²⁰
ebb = -5.3 × 10⁻²⁰ J/mol
eab = -5.4 × 10⁻²⁰ J /mol
The charge in internal energy will be
Δe = eab - 1/2 (eaa + ebb)
Δe = -5.4 × 10⁻²⁰ J /mol - 1/2 (-6.5 × 10⁻²⁰ - (-5.3 × 10⁻²⁰ J/mol)
Δe = 6.4 × 10⁻²⁰
enthalpy of mixing will be
ΔH mix = N₀.Z.XaXbΔe
ΔH mix = 6.0221 × 10²³ × 4 × Xa.Xb × 6.4 × 10⁻²⁰ (2)
We have
ΔH = XaXb (7500 Xa + 18200 Xb) (1)
(1) = (2)
154.165 × 10³ = 7500 Xa + 18200 Xb
As Xa = 1 - Xb
put in above eq.
154.165 × 10³ = 7500 (1 - Xb) + 18200 Xb
146665 = 10700 Xb
Xb = 0.0729
So fraction of B(Xb) = 0.0729
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Chlorine will combine with a non metal element carbon to form this molecular compound explain how these bonds are formed?
Answer: When carbon(C) combines with chlorine(Cl), carbon forms single covalent bond with each chlorine atom. The valence shell configuration of uncombined C atom is 2s2 2px1 2py1 .
During combination hybridisation takes place, an electron shifts from 2s to empty 2pz . These four orbitals merge to form four hybrid orbitals. Each hybrid orbital has 1 electron which pairs up with a valence electron of Cl atom to form a covalent bond. Thus the four hybrid orbitals form four single covalent bonds with four chlorine atoms. This completes each atom's octet and gives them noble gas configuration.
When two atoms of different elements combine they always have electronegativity(EN) difference due to which the shared pair of electrons is more closer to more electronegative atom. This gives the bonds some ionic character. So no bond between two atoms of different elements can be purely covalent.
Explanation:
A WHAT has to do with the direction of a force. Please Help
A. vector
B. scalar
C. speed
D. velocity
E. newton
indicate the relationship between the two structures in the pair. are they chair conformations of the same molecule? if so, are they conformational diastereomers, conformational enantiomers, or identical? if they are not conformations of the same molecule, what is their stereochemical relationship? two chair structures. both chairs are the same, but the substituents are in different locations. the carbons are arbitratily assigned numbers and move clockwise around the chair. starting from the top right, compound 1 has an axial methyl group pointing up at c 1, an axial methyl group pointing down at c2, an equatorial methyl group in c3 and an equatorial methyl group at c 4. in compound 2, there is an axial methyl group pointing up at c 1, an axial methyl group pointing down at c 6, an equatorial methyl group at c5 and an equatorial methyl group at c4. which statement is true? they are chair con
They are identical conformation of the same molecule.The groups which are pointed up are represented with wedge bonds and the groups which
are pointed down are represented with dash bonds.
One type of wire bonding called wedge bonds uses ultrasonic force and power to forge bonds. In the semiconductor industry, it is a well-liked and frequently applied technique. a mark that represents the location of a bond or group in relation to the paper or screen's surface. When a wedge is solid, it means that this bond or group is projecting outwards toward the observer. This bond or group is moving farther away from the viewer when the wedge is broken (hashed). A clamped piece of wire is coupled under a bonding tool (referred to as a wedge) and a bond pad during wedge bonding. A first wedge bond is created by applying pressure and ultrasonic energy for a predetermined amount of time.
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what is the energy, in j, of light that must be absorbed by a hydrogen atom to transition an electron from n
the energy, in j, of light that must be absorbed by a hydrogen atom to transition an electron from n is 2.179 x 10^-18J.
What is the most important thing that people should know about hydrogen?
The most important thing that people should know about hydrogen is that it is the most abundant element in the universe.
Some characteristics of hydrogen are:
Hydrogen is also the lightest element, and it is highly reactive.Hydrogen is found in most organic compounds and is essential for life. Hydrogen can also be used as a fuel, which can be used to power vehicles. Hydrogen is highly flammable, and has the potential to create powerful explosions.
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the concentration of a solution expressed in moles of solute per 1 l of solution is called either the or the concentration, and is given the symbol m.
The concentration of a solution expressed in moles of solute per 1L of solution is called either the molarity or the molar concentration.
A solution is a homogenous mixture of one or more solutes dissolved in solvent. An example of solution is salt and water.
The most common way to express solution concentration is molarity(M) which is defined as the amount of solute in moles divided by the volume of solution in liters.
Molar concentration is a measure of the concentration of a chemical species.
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Question 1 (1 point)
A new element has been discovered at Archer High School. The element symbol is Zz
and it has 2 naturally occurring isotopes.
The first isotope has a mass of 85.96 amu and a percent abundance of 87.20%.
The second isotope has a mass of 86.78 amu.
What is the average atomic mass of element Zz? Round to the hundredth's place
(0.01 or 2 decimal places).
Your Answer:
Answer
units
Answer:
86.06 amu is the average atomic mass of element Zz.
Explanation:
We may find the average atomic mass of Zz with a simple thought experiment. Let's imagine that we were given 100.0 grams of Zz. We know that 87.20% of that 100.0 grams is an isotope having 85.96 AMU (atomic mass units). That means the other 12.80% must be the isotope with 86.78 AMU.
Since we picked 100.0 grams, it is easy to see that we would have:
87.2 grams of 85.96 AMU, and
12.8 grams of 86.78 AMU
-----------
100.0 grams total
The contribution of each isotope can be calculated by taking it's percent abundance times it's AMU andf then adding the total results:
AMU % Contribution to total AMU
85.96 87.2 74.96
86.78 12.8 11.11
-------- --------- -----------
100.0 86.06 amu
The sum of the two weighted averaged amu numbers is the average atomic mass of element Zz. [Element Zz has a good futire as a sleep aid.]
When performing today’s experiment you leave the lid off your setup for the calibration. You remember that you left it off and decide to add it when determining the heat lost by the metal. When performing your calculations, you determine that your heat capacity values are off. Would your values be too high or too low?.
Thus we can see that if we leave the lid off our setup for the calibration which would allow some heat to escape to the atmosphere. This will yield a lower specific heat value
What is calibration ?
One of the fundamental methods required to ensure instrument accuracy is calibration. Calibration is the process of arranging an instrument to produce a result within an acceptable range for a sample. A major part of instrumentation design is eliminating or limiting causes that produce faulty measurements.
For today's tests, we leave the lid off our setup for calibration, allowing some heat to escape to the atmosphere. This results in a lower specific heat value.
For example, if the real value of Q before we remove the lid is 100 J, our calibration setup is 100 J.
And the metal mass is 10 g.
And the temperature has risen by 5 degrees Celsius.
Q = mcdT
Now, compute the value of C:
100 J = 10 g*C* 5C
C= 2 J / g-c
Now that the lid has been opened, some of the heat has escaped into the atmosphere,
and we have Q = 90 J.
Then;
Q = mcdT
Now, compute the value of C:
90 J = 10 g*C* 5C
C= 1.8J / g-c
Thus we can see that if we leave the lid off our setup for the calibration which would allow some heat to escape to the atmosphere. This will yield a lower specific heat value
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Which of the following is true ?
a.None of these
b.Phosphorus has 3 electrons in its outermost shell
c.Arsenic has 4 electrons in its outermost shell
d.Boron has 5 electrons in its outermost shell
e.Silicon has 5 electrons in its outermost shell
A. None of these is a true statement because
Phosphorus has 5 electrons in its outermost shell
Arsenic has 5 electrons in its outermost shell
Boron has 6 electrons in its outermost shell
Silicon has 4 electrons in its outermost shell
A mineral called phosphorus is found in many foods naturally and can also be taken as a supplement. It is a crucial component of cell membranes, bones, and teeth. It maintains a normal range of blood pH and aids in the activation of enzymes.
Many countries' groundwater naturally contains large amounts of arsenic.
Inorganic arsenic is extremely poisonous.
The greatest threat to public health from arsenic comes from contaminated water used for drinking, food preparation, and irrigation of food crops.
The only non-metallic element in group 13 of the periodic table is boron. Boron lacks electrons and has an empty p-orbital. Amorphous boron, a dark powder that is inert to oxygen, water, acids, and alkalis, is the most prevalent form of boron.
Chemical element silicon has the chemical symbol Si and atomic number 14. It is a tetravalent metalloid and semiconductor that has a blue-grey metallic sheen and is a hard, brittle crystalline solid. It belongs to the periodic table's group 14.
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