The amount of the sodium-25 that will remain after half an hour, given that it has a half life of 1.0 minutes is 5.0×10⁻³¹ Kg
How do I determine the amoun remaining after half hour?To obtain the amount that will remain after half hour, we'll begin by obtaining the number of half lives that has passed. Details below:
Half-life (t½) = 1.0 minuteTime (t) = 1/2 hour = 30 minutesNumber of half-lives (n) =?n = t / t½
n = 30 / 1
n = 30
Now, we shall determine the amount that will remain after half hour. This is shown below:
Number of half-lives (n) = 30Original amount (N₀) = 1 KgAmount remaining (N) = ?N = N₀ / 2ⁿ
N = 1 / 2³⁰
N = 5.0×10⁻³¹ Kg
Thus, from the above calculation, we can conclude that the amount that would remain is 5.0×10⁻³¹ Kg
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how many grams of ch3ohch3oh must be added to water to prepare 225 ml of a solution that is 2.5 m ch3ohch3oh ?
18.0121 grams of CH₃OH must be added to water to prepare 225ml of a solution that is 2.5 m CH₃OH.
Molarity of the solution is defined as the number moles of the solute present in one liter of the solution. Molarity is calculated from the equation,
M = No. of moles of solute / Volume of the solution in terms of liter.
Volume of solution given is 225 ml. As molarity is expressed in moles per liter.
Volume of solution = 0.225 L
Calculate the mole of CH₃OH by the expression of molarity,
225ml × 2.5 mole/1000 ml = 0.562 moles of CH₃OH .
Now convert 0.175 moles by multiplying molar mass of the solution. So,
0.562 moles × 32.05g of CH₃OH /1mole CH₃OH = 18.0121 grams
The volume equals to 18.0121 grams of CH₃OH.
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The normal boiling point of Substance A is 129.4 °C. Given that the vapor pressure of Substance A is 481.9 torr at 8.5 °C, calculate the molar enthalpy of vaporization to the nearest kJ/mol
Problem #8: A 5.00 L flask contains 3.00 g of mercury. The system is at room temperature of 25.0 °C. By how many degrees should we increase the temperature of the flask to triple the mercury vapor pressure. The enthalpy of vaporization for mercury is 59.11 kJ/mol?
Solution:
1) Let us use the Clausius-Clapeyron Equation:
with the following values:
P1 = 1 T1 = 298 K
P2 = 3 T2 = x
3) Set up equation with values:
ln (3/1) = (59110 / 8.31447) (1/298 minus 1/x)
1.0968 = 7109.2926 (1/298 minus 1/x)
1.0968 = 23.8567 minus 7109.2926/x)
x = 312.4 K = 39.4 °C
the empirical formula of a compound is ch2. its molecular mass is 70 g/mol. the molecular formula of the compound is
The molecular mass is indicated as being 70 g/mol. The molecule's chemical formula is C5H10
How can I determine the molecular mass?Use the mass listed in the Table Of the elements or Atomic Weight Tables to get the atomic mass for every element. To calculate the molecular mass, multiply the subscript (count of atoms) by the atomic mass of the relevant element then add the weights of all the other elements in the molecule.
How many moles is a gramme?The molarity of an element's atoms is determined by multiplying its standard comparative atomic mass by the molar constant, 1 103 grammes = 1 g/mol.
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In a single displacement reaction between al2s3 and li, what products will form and why?.
Lithium Sulphide ([tex]Li_{2}[/tex]S)and Al (Alumunium) will be formed In a single displacement reaction between al2s3 and li.
What is a single displacement reaction?
A single exchange reaction, also called a single substitution reaction, is a reaction in which one element in a compound is replaced by another. The starting materials are always pure elements such as pure zinc metal or hydrogen gas and aqueous compounds. When an exchange reaction occurs, a new aqueous compound and another pure element are produced as products.
Therefore, Lithium Sulphide ([tex]Li_{2}[/tex]S)and Al (Alumunium) will be formed In a single displacement reaction between al2s3 and li.
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Which substance has the stronger IMF's?
NaCl or CCL
Answer: NaCL
Explanation:
Because NaCl has a stronger IMFs because NaCl is closer to the highest IMF which is water and NaCl is in water.
place the best reagent in the bin for each of these reactions involving cyclohexylmethanol.
The best reagent in the bin for each of these reactions involving cyclohexylmethanol to cyclohexyl methyl bromide is NaBr.
The reagent used in the reaction of the cyclohexylmethanol to cyclohexyl methyl bromide is NaBr. the reaction is given as follows :
cyclohexylmethanol + NaBr ------> cyclohexyl methyl bromide
The reagent is used in the chemical reaction in order to find out the the another substances if it is present. A reagent is a substance is used to perform the laboratory test. the reagent is used to perform the above reaction is NaBr.
Thus, NaBr is the reagent used in cyclohexylmethanol to cyclohexyl methyl bromide.
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Predict the products (if any) that
will be formed by the reaction
below. If no reaction occurs, write
NR after the reaction arrow. Be
sure to include the proper phases
for all species within the reaction.
Al (s) + HCI (aq) >
The products formed by this reaction are aluminium chloride and hydrogen gas is liberated.
Why is it necessary to balance a chemical equation?
Lets take the example of combustion of methange gas:
CH4 + O2 -----> CO2+ H2O
You can see that on the reactant side (left side) of the equation, there is one carbon atom, four hydrogen atoms, and two oxygen atoms if you count the number of atoms (subscripts) of carbon, hydrogen, and oxygen on both sides of the equation.
One carbon atom, two hydrogen atoms, and three oxygen atoms can be found on the product side (right side). As a result, the equation is unbalanced and does not comply with the rule of conservation of mass.
In order to balance the equation, we must adjust the amounts of the reactants and products, as necessary, by inserting coefficients in front of the appropriate formula(s).
CH4 + 2O2 -----> CO2+ 2H2O
When aluminium is reacted with hydrochloric acid, it gives aqueous solution of aluminium chloride and liberation of hydrogen gas is seen.
2Al(s) + 6HCl(aq)--------> 2AlCl3 (aq)+ 3H2(g).
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Assuming that no new water molecules entered the glass while the water was freezing, would you say that frozen water (ice) takes up more space than liquid water, less space, or about the same?
Answer:
Frozen water(ice) indeed takes up a larger volume than water in liquid state.
Explanation:
This is because when water liquid turns into a solid, energy is absorbed hence it gets cooler, the bonds are strengthen and expands to its maximum.
this means that the structure changes when water turns to ice, from the semi random arrange in liquid state to lattice in ice. this expansion between the molecules have alot of space between it, the molecules are less compact.
Since the molecules are less compact, ice is therefore less dense than water, hence it floats on water and not sink.
And this almost means that ice increases in volume by approximately 9% than its initial liquid water.
Very small changes in the solute concentrations in the various fluid compartments cause water to move from one compartment to another, which alters blood composition and blood pressure. How do the following physiological changes affect blood pressure?.
a. Decrease water reabsorption : decrease blood pressure.
b. Decrease peripheral resistance : decrease blood pressure
c. Vasodilation : decrease blood pressure
d. Decrease salt intake : decrease blood pressure
e. Decrease blood volume : decrease blood pressure
f. Vasoconstriction : increase blood pressure
g. Increase peripheral resistance: increase blood pressure
h. Increase salt intake: increase blood pressure
i. Increase blood volume : increase blood pressure
j. Increase water reabsorption: increase blood pressure
Total peripheral resistance: This phrase describes the obstruction to blood flow that the vascular system presents. The contact between the blood and the vessel's walls causes this resistance. It is, in other words, the vessels' resistance to blood flow. The sum of all the gruesome circuit resistances in the body is the total peripheral resistance. Total peripheral resistance rises as a result of mechanisms that cause vasoconstriction, while total peripheral resistance falls as a result of mechanisms that cause vasodilation.
Blood pressure:
This phrase describes the force that the blood exerts when it flows against the vessel walls. The volume and strength of the blasted blood as well as the vessel's size and suppleness all affect this pressure. Continuous blood pressure variations are caused by factors such as activity, temperature, nutrition, and emotional state.
Complete question:
Very small changes in the solute concentrations in the various fluid compartments cause water to move from one compartment to another, which alters blood composition and blood pressure. How do the following physiological changes affect blood pressure?
a. Decrease water reabsorption
b. Decrease peripheral resistance
c. Vasodilation
d. Decrease salt intake
e. Decrease blood volume
f. Vasoconstriction
g. Increase peripheral resistance
h. Increase salt intake
i. Increase blood volume
j. Increase water reabsorption
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judy tests a common household substance and finds that it has a ph of 7. what type of substance is in the scenario?
On the pH scale, the pH range for an acid is 0–7 and the pH range for a base is 7–14. pH 7 refers to a neutral solution. pH-7 pure water is a substance considered neutral.
Is hydrogen an ion of H+?This substance, which consists of a water molecule with a proton (H+) added, is an ion because it has a charge. It is known as the hydronium ion and has the formula H3O+. When an acid dissolves in water, the hydronium ion is always produced. Always interacting with the nearby water molecule to generate H3O+, the acid's H+.
What are the uses of H3O+?For the detection of trace gases in the air, chemical ionization using proton-transfer reactions with hydronium ions (H3O+) is frequently used.
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a metal (fw 340.1 g/mol) crystallizes into a body-centered cubic unit cell and has a radius of 2.87 angstrom. what is the density of this metal in g/cm3?
It is discovered that an unidentified metal crystallizes in a body-centered cubic lattice and has a density of 7.8748 g/cm3. The unit cell's edge measures 0.28664 nm.
If iron crystallizes in a body-centered cubic unit cell with an edge length of 287 pm, what is its density?A body-centered cubic unit cell with an edge length of 287 pm forms during the crystallization of iron metal. 287 p m . Iron has a molar mass of 55.85 gmol (1.85 gmol) and a density of 7.86 gcm (3.86 g c m)
Consequently, the formula for obtaining 7.97 g of iodine is: = 789.4 g x 7.97 g / 761.4 of NI3 = 6291.518 / 761.4 of NI3 = 8.26 g of NI3 Hence Grams.
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What percent of the world's table salt comes from the ocean?
Answer:
3.5%Explanation:
About 3.5% of the weight of seawater is made up of dissolved salts because of the salinity, or salt concentration, of saltwater, which is 35 parts per thousand.
_________________
Hope this helps!
Have a great day!
Answer:
the Caribbean
Explanation:
look below for question
model an atom as an electron in a rigid box of length 0.100 nm, roughly twice the bohr radius. what are the four lowest energy levels of the electron?
The least energetic electrons are those in energy level I, also known as energy level K.Higher level electrons have more energy as you move away from the nucleus, and this energy increase is fixed and discrete.
What are the four main levels of energy?Sharp, Principle, Diffuse, and F are the four you need to be aware of (fine or fundamental).So, s, p, d, & f.Only that many sublevels are contained in the Principal Energy Level (the number).
Where is the place with the least energy?A 1s sublevel, which has a single orbital, is always the sublevel with the lowest energy.In its ground state, the hydrogen atom's lone electron will be located in the 1s orbital.As we move on to atoms containing multiple electrons, those additional electrons are added to the subsequent lowest sublevel, such as 2s, 2p, 3s, and so forth.
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gel electrophoresis separates molecules according to all of the following except question 1 options: a) color b) charge c) size d) shape\
Gel -electrophoresis is used to separate mixture of proteins, and other organic compounds based on their charge, size or shape but not by color.
What is gel electrophoresis?Gel electrophoresis is used to separate combinations of DNA, RNA, or proteins based on their molecular sizes. In gel electrophoresis, the molecules that need to be separated are forced through a gel that has tiny pores by an electrical field.
The speed at which the molecules move through the pores in the gel is inversely proportional to their size. This indicates that a smaller molecule will move through the gel further than a larger the molecule.
However, gel electrophoresis does not involve a separation based on the color of the compounds. Thus, option a is correct.
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HELP!!! >_<
Instructions: Write and balance molecular equations for the following reactions between aqueous solutions. You will need to decide on the formulas and phases of the products in each of the cases.
Question: An aqueous solution of barium nitrate is mixed with an aqueous solution of potassium phosphate.
Balanced chemical equation:
[tex]3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ----- > 6 KNO3 (aq) + Ba3(PO4)2(s)[/tex]
What is double-displacement reaction?
In an aqueous solution, a double-displacement reaction takes place when the positive and negative ions of two ionic compounds exchange positions to form two completely different compounds.
Chemical formula for :
Barium nitrate---> Ba(NO3)2 (aq)
Pottasium Phosphate = K3PO4 (aq)
Reaction between these two is a type of double displacement type reaction in which ions are exchanged , forming
Pottasium Nitrate -----> KNO3 (aq)
Barium Phosphate -----> Ba3(PO4)2 (s)
(aq) means the phase is aqueous and (s) means phase is solid or the compound precipitated out .
Now, writing the molecular formula using the above data , we get:
[tex]Ba(NO3)2 (aq) + K3PO4 (aq) ------ > KNO3 (aq) + Ba3(PO4)2 (s)[/tex]
A equation is called balanced when number of chemical species are same on both sides of the equation .
Here, in product side there are 3 Ba and 2 (PO4) and only 1 Ba and 1 PO4 in reactant side to balance this let's multiply
2 with K3PO4 on reactant side and ,
3 with Ba(NO3)2 on reactant side
The equation thus becomes:
[tex]3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ------ > KNO3 (aq) + Ba3(PO4)2 (s)[/tex]
Now,
There are 6 K atoms on reactant side to balance this let's multiply 6 with KNO3 in product side by doing so we also balanced NO3.
Consequently, the balanced chemical equation is
3 Ba(NO3)2 (aq) + 2 K3PO4 (aq) ----- > 6 KNO3 (aq) + Ba3(PO4)2(s)
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Photosynthesis would occur in which of the following organisms?
frogs
tree trunks
honeybees
grass
Answer:
grass
Explanation:
only the grass would actively have photosynthesis occur. frogs and honeybees do not use photosynthesis to produce "food". tree trunks are not the part of the organism that performs photosynthesis.
Answer: Grass!
Explanation: Grass produces food for itself through a process called photosynthesis, Just like trees. Leaves soak up light Thats what the word photo means In "Photosynthesis" And then the light soaked up from the leaves and a chemical occurs called chlorophyll
a 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 300.0 ml hbr.
Formula to determine Ph after Titration: pOH = -log(OH).
The pH of the solution after the addition of 300.0 ml of HBr is 1.6.
What is a Titration?Titration is a popular laboratory technique for quantitative chemical analysis to calculate the concentration of an identified analyte (also known as titrimetry and volumetric analysis) (a substance to be analyzed). A standard solution with a known concentration and volume is created as the reagent, also known as the titrant or titrator. To ascertain the concentration of the analyte, the titrant reacts with a solution of the analyte (also known as the titrant). The titration volume is the amount of titrant that interacted with the analyte.
Now;
Conc of Ca, pH of the solution before the addition of any HBr. :
pOH = -log(OH)
[OH-] = 2*[Ca(OH)2] = 2*(0.1) = 0.2 M
pOH = -log(0.2) = 0.698
pH = 14-0.698
pH = 13.3
pH of the solution after the addition of 300.0 mL HBr:
mmol of OH- = 2*MV = 2*100*0.1 = 20 mmol of OH-
mmol of H+ = MV = 0.1*V = 0.1*300= 30 mmol of HBr
left ion = 30-20 = 10 mmol of OH-
V = 100+300 = 400 mL
[H+] = 10/400 = 0.025 M
pH= -log(0.025 ) = 1.6
Formula to determine Ph after Titration: pOH = -log(OH).
The pH of the solution after the addition of 300.0 ml of HBr is 1.6.
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If you are given two moles of a substance, which of the following would be correct?
You have the same number of particles as in 12 grams of carbon-12.
You have one-third the number of particles that are in 12 grams of carbon-12.
You have two times the number of particles that are in 12 grams of carbon-12.
You have one half the number of particles that are in 12 grams of carbong-12.
Answer:
C. You have two times the number of particles that are in 12 grams of carbon-12.
Explanation:
Avogadro's number, 6.022 ×10^23, equals the number of particles in 12 grams of carbon-12.
This mean 1 mole of a substance will equals to the number of particles that are in 12 grams of carbon-12.
Therefore, 2 moles of a substance will equals to two times the number of particles that are in 12 grams of carbon-12.
Assertion (A): Slaking of lime is an exothermic and combination reaction. Reason (R): Quick lime reacts with water to produce slaked lime.
Assertion (A) : Slaking of lime is an exothermic and combination reaction. Reason (R ) : Quick lime reacts with water to produce slaked lime. Thus the correct answer is option A Both (A) and (R) are true and (R) is correct explanation of the assertion.
Why is the Assertion correct?Slaking of lime, which is the process of adding water to quicklime to produce slaked lime, is an exothermic and combination reaction.
Quicklime, also known as calcium oxide, is a highly reactive substance that reacts with water to produce slaked lime, which is calcium hydroxide.
Therefore, The reaction is exothermic because it releases heat, and it is a combination reaction because it involves the combination of two substances to form a new compound. The reason given in (R) correctly explains the assertion in (A).
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See full question below
Assertion (A) : Slaking of lime is an exothermic and combination reaction.
Reason (R ) : Quick lime reacts with water to produce slaked lime.
A
Both (A) and (R) are true and (R) is correct explanation of the assertion.
B
Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
C
(A) is true but (R) is false.
D
(A) is false but (R) is true.
rank the following ionic compounds based on increasing lattice energy. mgo, cacl2, nacl, nabr
The highest lattice energy among the given compounds is for MgO. The increasing order of lattice energy for these compounds is NaBr <NaCl< CaCl₂ < MgO.
What is lattice energy?Lattice energy of a compound is the energy required to convert one mole of the compound into its constituent ions in gaseous states. Lattice energy increases with decrease in size and increase in charge.
Thus, compound containing smaller ions with higher charges are having greater lattice energy. Both Mg and oxygen are smaller in size and have charges of +2 and -2 respectively. Na and Ca are bigger than Mg.
Ca2+ is smaller and greater in charge than Na+. Among NaCl and NaBr, Cl is smaller compared to Br thus NaCl has higher lattice energy.
Therefore, the increasing order of lattice energy is NaBr <NaCl< CaCl₂ < MgO.
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what is the percent yield if 200 g of a product is produced during a reaction that has the potential of producing 250 g?
The answer for the percentage yield is 80%.
What is percentage yield?
Recovery is the ratio of actual recovery to theoretical recovery. It is calculated by dividing the experimental yield by the theoretical yield and multiplying by 100%. If the actual and theoretical yields are equal, the yield rate is 100%. Yields are usually less than 100% because actual yields are often lower than theoretical. This may be due to incomplete or competing reactions and sample loss during recovery. Recoveries can exceed 100%. This means that more samples were recovered from the reaction than expected. This can occur when other reactions that form the product occur. Another potential source of error is overage caused by incomplete removal of moisture or other contaminants from the sample. Yield is always positive.
Therefore, The answer for the percentage yield is 80%.
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Which changes always happen during a fission reaction?(1 point)
What happens during a fission reaction is that matter is converted to energy.
What is fission?We define the term fission as the kind of reaction that involves the breaking of the nucleus of an atom and then there would be a release of energy. There are various kinds of nuclear reactions that we have but the most common types of nuclear reactions are the fission and the fusion reaction.
In the fusion reaction we have the combination of two or more lighter nucleus so as to produce a heavier nucleus while in the case of the fission reaction the nucleus would have to be broken up so that energy can be released in the process.
Thus, we see that the total mass on the left hand side may not be the same as the total mass on the left hand side because some of the mas is converted to energy.
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Missing parts;
Which change occurs during a nuclear fission reaction?
(1) Covalent bonds are converted to ionic bonds.
(2) Isotopes are converted to isomers.
(3) Temperature is converted to mass.
(4) Matter is converted to energy
Select all that apply. The discoveries of niels bohr were: quantum energy emissions charge on the electron orbits of electrons static electricity.
Orbits of electrons, -quantum energy emissions and -relationship between outer shell and chemical properties.
What is electron?electron is a subatomic particle with a charge of sub-atomic electricity found in all atom and is the primary carrier of electricity in solid.
Neil Bohr was the first who explained that electrons moves around the nucleus in the separate orbits or shells in an atom. The properties of an element is determined by the number of electrons in outer shell. He also discovered that electrons can only be in a particular orbits of fixed energy and when electrons allowed to jump from one orbit to another, they absorbed or emitted electromagnetic radiation.
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Complete Question
Select all that apply. The discoveries of Niels Bohr were:
- orbits of electrons
-charge on the electron
- quantum energy emissions
- static electricity
- relationship between outer shell and chemical properties
What are the values of δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25°c?.
Answer: nose
Explanation:sorry
When red, green, and blue light are combined in equal proportions the result is? Yellow light Green light Black light White light O Ultraviolet radiation
Answer: white light
Explanation:
because complementary colors... but dont expect the same thing to work with paint. obviously
Oxygen can be produced in the chemistry lab at a low temperature if mixed with manganese dioxide, which acts as a catalyst in the reaction. The chemical equation for the production of oxygen using potassium chlorate is:.
The process of 2KClO3 → 2KCl + 3O2 exhibits both oxidation-reduction and breakdown.
When a specie is broken down into its component parts, it is said to be decomposing. KClO3 was converted into KCl and O2 during this process. Because of this, the reaction is categorized as one of breakdown.
It is also an oxidation-reduction reaction since the oxidation number of the chlorine atom was decreased from +5 to -1 while the oxidation number of the oxygen atom was enhanced from -2 to zero.
So, It's important to keep in mind that a reaction can only be a combustion if oxygen is one of the reactants.
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Calculate the kinetic energy of the cart at the point shown below. It has a mass of 0.5 kg, is 2.0 m high, and is moving at a velocity of 1.5 m/s. Round your answer to the hundredths place (two the decimal places).
Answer:
this is ez 123
Explanation:
Which of these is a renewable resource found in Nevada?
A.
gravel deposits
B.
petroleum products
C.
zinc metal
D.
geothermal energy
Answer:
D.geothermal energy
Explanation:
The State of Nevada has abundant solar, wind, and biomass energy sources, but has more potential for geothermal energy production than any other state.
How many protons, neutrons, and electrons does Iron (Fe) have if it has a +4 charge?
The number of protons, neutrons, and electrons that iron (Fe) have if it has a +4 charge are 26, 29 and 22 respectively.
How to calculate proton, electron and neutron numbers?Atomic number of an element is the number of protons in the atom of that element. The number of protons of a neutral atom i.e. charge 0 is equal to the number of electrons.
Iron is a metallic chemical element having atomic number 26 and symbol Fe. Since the atomic number is 26, the number of protons is 26.
If the charge of the iron is +4, this means that the number of protons will be 26 while the number of electrons will be 22. The number of protons will be 55 - 26 = 29.
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