The heat capacity of calorimeter is 133.76 J/c.
What is calorimeter?
A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and trying to measure the heat of chemical reactions or even other physical changes. Among the most popular kinds are dsc calorimeters, isothermal micro calorimeters, titrimetric calorimeters, and accelerated rate calorimeters. A straightforward calorimeter is just a metal container with a thermometer suspended beyond a combustion chamber. It's one of the measurement tools used in the research of chemistry, biochemistry, and thermodynamics. The two substances A and B are separately added to a calorimeter, and the original and final temperatures are recorded, in order to determine the enthalpy change per mole of substance A in a reaction between those two substances.
We know:
mw Cw Ow = mc Cc delOc + Ccal delc
80g * 4.18/gc * (80-45)C = 80g * 4.18J/g * (45-20) + Ccal *(45-20)
= 11704J = 8360 + Ccal (25)
= 133.76 j/c
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without looking at the periodic table, write the complete electron configuration for the group 2 element in the fourth period.
The electronic configuration of the elements of the second group of the second period is 1s²2s²2 1s2 2p6 3s2 3p64s² or 2,8,8,2
To determine the external electronic configuration of an element, knowing the number is needed. Electrons and usage configuration rules (or electron energy levels).
The number of electrons in a neutral atom is the same as the number of protons.
The number of protons is the atomic number of the element. The
elements are arranged in the periodic table according to their atomic number.
The elements of group 2 are calcium and magnesium
The atomic number, number of protons, and number of electrons of group 2 elements are 40
Now we can distribute the electrons according to the structural rules:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
The outer shell has n = 2, so the outer electron configuration is 4s²
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What mass of NaHCO, is decomposed by 256 kJ?
Answer: 91.5 kJ
Explanation:
Create an energy transformation for playing the piano. EX: Thermal to Electrical
A piano contains both mechanical and acoustic energy. Mechanical energy is created when you press a key; as a result, the strings vibrate when the hammer strikes them, producing sound.
What converts thermal energy to electrical energy?
Using a thermoelectric generator, thermal energy can be transformed into electrical energy.
What is thermal energy?
The term "thermal energy" is used a lot of different ways in physics and engineering. It may be related to a number of different physical concepts.
What is electric energy?
Electrical energy is related to forces on electrically charged particles and the motion of electrically charged particles, frequently electrons in wires.
Hence mechanical and acoustic energy is a correct answer.
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examine the p-block elements of the 2nd period (b through ne). which subshell is being filled while moving across these elements? what is the maximum number of electrons this subshell can hold?
It covers 6 elements, from boron to neon. Boron is in group 13, carbon in group 14, nitrogen in group 15, oxygen in group 16, fluorine in group 17 and neon in group 18. Subshell is being filled while moving across these elements is p subshell with maximum number of electrons this subshell can hold to 6 electrons
Different subshells hold a different maximum number of electrons. Any s subshell can hold up to 2 electrons; p subshell up to 6 electrons; d subshell up to 10; and f subshell up to 14.
The atomic number of boron is 5. Here is the electronic configuration:
B₅ = 1s² 2s² 2p¹
The atomic number of carbon is 6. Here is the electronic configuration:
C₆ = 1s² 2s² 2p²
The atomic number of nitrogen is 7. Here is the electronic configuration:
N₇ = 1s² 2s² 2p³
The atomic number of oxygen is 8. Here is the electronic configuration:
O₈ = 1s² 2s² 2p⁴
The atomic number of fluorine is 9. Here is the electronic configuration:
F₉ = 1s² 2s² 2p⁵
The atomic number of neon is 10. Here is the electronic configuration:
Ne₁₀ = 1s² 2s² 2p⁶
It can be seen that each electron configuration is embedded with a 2p subshell with maximum number of electrons this subshell can hold to 6 electrons.
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if 2.00L of a 0.032M Li2O solution has the water evaporates, what mass of Li2O would remain
Based on the molarity and volume of the solution the mass of Li₂O obtained if 2.00L of a 0.032M Li2O solution has all the water evaporated is 1.92 g.
How many moles of Li₂O are present in 2.00 L of a 0.032M Li₂O solution?The number of moles of Li₂O present in 2.00 L of a 0.032M Li₂O solution is determined using the formula below:
Molarity = number of moles / volume in litersHence;
Number of moles = molarity * volume in liters
Molarity of the Li₂O solution = 0.032 M
Volume of solution = 2.00 L
Number of moles = 0.032 * 2.00
Number of moles of Li₂O = 0.064 moles
Mass of Li₂O = number of moles * molar massMolar mass of Li₂O = 30 g/mol
Mass of Li₂O obtained = 0.064 * 30
Mass of Li₂O obtained = 1.92 g
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the decomposition of hi(g)hi(g) at 298k298k is represented by the equilibrium equation above. when 100.torr100.torr of hi(g)hi(g) is added to a previously evacuated, rigid container and allowed to reach equilibrium, the partial pressure of i2(g)i2(g) is approximately 3.7torr3.7torr. if the initial pressure of hi(g)hi(g) is increased to 200.torr 200.torr and the process is repeated at the same temperature, which of the following correctly predicts the equilibrium partial pressure of i2(g)i2(g), and why?
PI2 ≈ 7.4 torrPI2 ≈ 7.4 torrs because it is directly proportional to the initial pressure of HIHI.
At equilibrium, the forward and reverse reactions occur at the same rate. Once equilibrium is reached, the amounts of each reactant and product remain constant. The equilibrium constant equation is a mathematical relationship that describes how the concentrations of products vary with the concentrations of reactants.
The state of a system whose properties are fixed under unvarying external conditions is called the equilibrium state. Chemical equilibria are dynamic in nature because reactants turn into products and products turn into reactants even after equilibrium is reached. However, the speed of forward and backward reactions is the same. Examples of balance include A book placed on the table. A car that moves at a constant speed. A chemical reaction in which the forward and reverse reaction rates are equal.
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solutions made of the same type of nanoparticle can be very different colors. choose which property determines the color of a nanoparticle solution.
The volume and shape of a nanoparticle determines how it interacts with light. This determines the color of a nanoparticle solution.
The coloration depends on the size and form of the nanoparticles, in addition to the distance between them. Right here, the red nano gold particles are approximately 20 nanometers across, whilst the orange nano gold particles are about 80 nanometers across.
Nanoparticles appear positive colors because they mirror (scatter) and take in unique wavelengths of visible light. Light which seems white is a more or less same combination of the wavelengths of light that can be perceived by means of the human eye, more or less four 100 to 750 nm.
As particle length increases, the wavelength of surface plasmon resonance associated absorption shifts to longer, redder wavelengths. red light is then absorbed, and blue light is pondered, yielding answers with a faded blue or red color.
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a gas sample is collected in a balloon. what happens to the density of the gas sample as the sample is heated?
The density of the gas will decrease as we heat the gas.
Density of a system is defined by mass per unit volume. Density basically describes how compact or concentrated something is. For example, suppose you have two boxes, one is large and one is small. However, they both weigh the same. But we see that the small box has a higher density than the large box. So, density also tells how concentrated or crowded something is.
Considering the above given case, when we take a gas sample in a balloon and then when we start to heat this sample, due to hear we can see that the gas molecules will try to move more far from each other and therefor the density of the system will decrease. This same concept is been used in hot air balloons too. When we heat the balloon the density of the gas will decrease and therefor the balloon floats in the air.
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at standard temperature and pressure, a given sample of water vapor occupies a volume of 2.80 l. how many moles of water vapor are present?
To learn the mole concept and standard temperature.
What is standard temperature?
Therefore, 0 degrees Celsius, which translates to 32 degrees Fahrenheit or 273.15 degrees Kelvin, is considered the standard temperature. This is essentially the temperature at which pure water at sea level will freeze when exposed to air at standard pressure.
What is mole?
A mole is a crucial unit of measurement used by chemists. Similar to how having a dozen eggs means you have twelve eggs, having a mole of something indicates that you have 602,214,076,000,000,000,000,000 of that particular thing. Chemists must measure very small objects, such as atoms, molecules, or other particles, using moles.
Therefore there are 0.125 moles of water vapor present.
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Iconic bonds, fill in the blanks
In Ionic Bond metals lose valence electrons and become positively charged cations, non metals accepts valence electrons and become negatively charged anions .
Ionic bonds are formed in vicinity of atoms like for example NaCl , KCl , CaCl₂.
Ionic bonding is the complete transfer of valence electrons between atoms. Ionic compounds obey octet rule and become more stable and so they are typically neutral.
Ionic Bonds, metals lose valence electrons and become Positively charged cation .
Non metals accepts electrons and becomes negatively charged anion.
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determine whether li or na that has the more negative (more exothermic) electron affinity. li na determine whether s or mg that has the more negative (more exothermic) electron affinity. mg s determine whether c or n that has the more negative (more exothermic) electron affinity. n c determine whether cl or al that has the more negative (more exothermic) electron affinity. g
Lithium and sodium lithium is more negative electron affinity and magnesium and sulfur then sulfur is more negative electron affinity and nitrogen has lower electron affinity and chlorine has more negative electron affinity
Non metal like to gain electron to form anion to have a fully stable octet and they release energy means exothermic and to gain electron to form an anion and thus electron affinity of nonmetal is higher than that of metal
Lithium and sodium that is any lithium is more negative electron affinity and this is because lithium is smaller in size in that of any right due to one share of which strong interaction between nucleus and extra electron uppers and then magnesium and sulfur are both located in the same row in the periodic table and as general rule electron affinities for main group element become more negative moving right across a period and therefore sulfur is expected to have the more negative electron affinity and nitrogen has lower electron affinity than its preceding element carbon and the chlorine atom has more negative electron affinity which means that it will release more energy when it accept more electron
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which 2 layers of the earth are made out of rock
ayou are trying to determine the age of a lava flow using an isotope with a half-life of 1.5 million years. if the sample has gone through four half-lives, what is the age of the rock?
The age of the rock is 6 million years.
What is a half-life of an isotope?
A radionuclide's half-life is the amount of time it takes for half of its radioactive atoms to decay.
Do all isotopes have a half-life?
All isotopes have a half-life if proton decay is real, but those that are stable in a universe without proton decay will simply live a lot longer than the others.
Why are isotopes measured in half-lives?
Due to an isotope sample's exponential rate of decay over time, the half-life is used as a practical measurement. In a fixed amount of time, each atom is given the same chance of decaying, which causes exponential decay.
Age=4 half lives * 1.4MY/half life
Age=6 million years.
Thus, the age of the rock is 6 million years.
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Which of the following were goals of Reconstruction? Check all of the boxes that apply. to reincorporate the South into the Unionto create a segregated society in the Southto establish equality under law for African Americansto assist African Americans in the transition from slavery to freedom
Answer: The goals of Reconstruction were to reincorporate the South into the Union, to establish equality under law for African Americans, and to assist African Americans in the transition from slavery to freedom.
Explanation: The Reconstruction was the period that followed the Civil War and during which the southern states that had adhered to the defeated Confederation were reintegrated into the Union. The devastating southern unionist invasion, attacks on civilian targets and the destruction of infrastructure, together with the economic policy that was implemented in the territory of the defeated after the war, caused the rise of a bitter rancor of many Southerners against the federal government. :D Hope I helped!
which is the strongest gravitational pull on earth,the sun or the moon why
Answer:
The sun
Explanation:
The sun is much heavier, it also pulls all eight planets towards its center and keeps them in their orbits.
Hope this helps
Answer:
The sun, because it is the largest one, and has the greatest gravitational pull. It keeps the earth in orbit around it.
How did Wegener use the shapes of the continents as evidence that the continents had moved?
Answer:
Wegener used fossil evidence to support his continental drift hypothesis. The fossils of these organisms are found on lands that are now far apart.
Explanation:
Grooves and rock deposits left by ancient glaciers are found today on different continents very close to the equator.
The density of WATER is 1gmL. Is the unlabeled clear liquid WATER? Why or why not?
What are the oxidation states of nitrogen in the compounds
NO, NO2, N2O3, N2O4 and N₂O5 respectively
Answer:
NO: +2
NO2: 3
N2O3: +3
N2O4: 4
N2O5: 5
Explanation:
If you forgot to add the primers to your pcr reaction, what would happen and why?.
Your experiment would not work because Taq polymerase needs a tiny bit of DNA to add bases to. Due to the lack of an enzyme that could add new nucleotide bases, your process would not succeed.
What would happen if the primers for your PCR reaction were left out?The primers are absolutely necessary for a PCR reaction to work. The RNA primers must anneal before the heat-resistant DNA polymerases may start replicating DNA. The DNA polymerase cannot work without the primers, and as a result, no product will be produced.
DNA polymerase requires a primer on which it may add the first nucleotide since it can only add a nucleotide onto an already-existing 3'-OH group. This prerequisite allows the researcher to identify a particular area of the template sequence that they want to amplify.
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name a compound that has 4 atoms thats not NH3 or CH4
Answer:
NH4/Ammonium
Explanation:
Uv rays are a type of ""ionizing radiation"" and are energetic enough to damage biological tissue such that they degrade into ions and electrons. What other forms of electromagnetic radiation do you think could be ionizing?.
Other forms of electromagnetic radiation that could cause ionization are X-rays and gamma rays
Ionizing radiation is a form of energy that acts generally by removing electrons from atoms and molecules of materials that include air, water, and living tissue etc. Ionizing radiation can travel unseen and can pass through these materials.
Human activities, such as making medical x- rays, generating electricity from nuclear power plants , testing the nuclear weapons, and producing a wide variety of common products such as smoke detectors which usually contains radioactive materials, can cause additional exposure to ionizing radiation as well.
X-rays and gamma rays have enough energy so that during interaction with atoms, they are capable to remove electrons and cause the atom to become charged or ionized. hence we can call them to be ionizing radiation.
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. Balance the equations and identify the type of reaction. (48 points total: 6 points per question=2
points per reaction type and 4 points for the coefficients)
a. ___Na3N → ___Na + ___N2 Reaction Type:
b. ___H3PO4 + ___KOH → ___K3PO4 + ___H2O Reaction Type:
c. ___N2 + ___H2 → ___NH3 Reaction Type:
d. ___H2O2 → ___ O2 + ___ H2O Reaction Type:
e. ___Zn+ ___HCl → ___ZnCl2 + ___ H2 Reaction Type:
f. ___C2H6 + ___O2 → ___ CO2 + ___H2O Reaction Type:
g. ___CuCl2 + ___ H2S → ___CuS + ___HCl Reaction Type:
h. ___N2 + ___ O2 → ___ N2O5 Reaction Type:
The balanced equation of the reaction and the reaction types are given below as follows:
a. 2 Na₃N → 6 Na + N₂ Reaction Type: decomposition reaction
b. H₃PO₄ + 3 KOH → K₃PO₄ + 3 H₂O Reaction Type: Neutralization reaction
c. N₂ + 3 H₂ → 2 NH₃ Reaction Type: Synthesis
d. 2 H₂O₂ → O₂ + 2 H₂O Reaction Type: Decomposition
e. Zn+ 2 HCl → ZnCl₂ + H₂ Reaction Type: single displacement
f. 2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O Reaction Type: Combustion
g. CuCl₂ + H₂S → CuS + 2 HCl Reaction Type: Double displacement
h. 2 N₂ + 5 O2 → 2 N₂O₅ Reaction Type: Synthesis
What are chemical reactions?Chemical reactions are reactions that result in the formation of new substances as a result of chemical changes that occur in the substances undergoing the reaction.
In a chemical reaction, the substances that undergo chemical changes are called reactants while the new substances that are formed are called products.
A balanced equation of a chemical reaction is one in which the moles of atoms of reactants are equal to the moles of atoms of the products involved in the reaction.
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how does the concentration of an acidic liquid affect the volume of the acidic liquid needed to neutralize an alkaline solution?
Increasing the volume of the solution decreases the concentration of the hydrogen ions which subsequently increases the pH; hence, increasing volume will increase the pH.
What does concentration of acidic liquid affect volume needed for neutralization?Higher is the concentration of H plus ions, more acidic is the solution and lower the concentration of H plus ions, the less acidic is the solution. Basic strength of a solution depends on the concentration of OH minus ions.
When an acid and alkali react together, they produce salt and water. Acid + alkali → salt + water . As you know, water is neutral, so the acid alkali come together to neutralize each other to make pH 7.
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When heated, NaOH decompoe according to the following equation. If all of the water i produced a water vapor, what i the expected ma lo for a 8.87 gram ample of NaOH? Report your anwer with three ignificant figure.
2 NaOH () → Na2O () H2O (g)
Answer:
I'm pretty sure its 2.73 g
Explanation:
which element has the longest name
Rutherfordium is the longest element name on the periodic table.
What is Rutherfordium?
Rutherfordium is a chemical element with the symbol Rf and atomic number 104, named after the British physicist Ernest Rutherford, who was born in New Zealand. It is not present in nature as a synthetic element and can only be created in a laboratory. It is radioactive; the half-life of the most stable known isotope, 267Rf, is 1.3 hours. It is a d-block element and the second of the fourth-row transition elements in the periodic table. It is a group 4 element in period 7. Experiments in chemistry have proven that rutherfordium is the heavier homolog to hafnium in group 4. Rutherfordium's chemical properties are only partially known.
Rutherfordium is the longest element name on the periodic table with 13 alphabets in its name.
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when it combines with the calcium carbonate, the acetic acid and the calcium carbonate come apart and reform in different ways to make new chemicals
when vinegar combines with the calcium carbonate, the acetic acid and the calcium carbonate come apart and reform in different ways to make new chemicals. One of them is the gas carbon dioxide.
The molar mass of CaCO3 is 100.0 g/mole so you need 727300g or 727.3 kg of limestone. Calcite or aragonite are the most common forms of limestone, a sedimentary rock mostly made of calcium carbonate (CaCO3). It could have a significant magnesium carbonate content (dolomite).
Lime, the base calcium oxide, is left behind after heating the limestone (calcium carbonate). The original limestone will be replaced with white lime that is more crumbly in texture. Water and calcium carbonate do not react.
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Can the element gold kick out magnesium from a compound?
Gold cannot replace Magnesium from a compound as gold is placed lowest in the reactivity series of metals. It won't even react with the compound let alone replace it. Gold has great ductile strength and malleability.
Features of Reactivity Series of Metals
The metals at the top of the reactivity series are powerful reducing agents since they are very easily oxidized. These metals tarnish or corrode very easily though.The reducing ability of the metals grows weaker while traversing down the reactivity series.The electro-positivity of the elements also reduces while moving down the reactivity series of metals. All metals that are found above hydrogen in the activity series liberate H2 gas upon reacting with dilute hydrochloric acid(HCl) or dilute sulphuric acid(H2SO4).Metals than on the reactivity series have the ability to displace metals that are placed lower from their salt solutions such as Mg can replace Au but Au cannot replace Mg as Au is kept lowest in the reactivity seriesHigher ranking metals require greater energy for their isolation from ores and other compounds to stay highly reactive.Therefore Gold cannot replace Magnesium from a compound as it is the least reactive metal and therefore, comes lower than Magnesium in the reactivity series
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what is the ph of a solution prepared by diluting 15.00 ml of 0.10 m hcl with enough water to produce a total volume of 100.00 ml?
The pH of a solution prepared by diluting 15.00 ml of 0.10 m HCl with enough water to produce a total volume of 100.00 ml will be 1.823
What is Molarity (M)?
The amount of a substance in a specific volume of solution is known as its molarity (M). It is also defined as the number of moles of a solute per liter of a solution. The molar concentration of a solution is another name for molarity.
It can be expressed as:
M = \frac{n}{v}
where, M = molar concentration
n = moles of solute
v = liters of solution
Given values: total volume = 100.00 ml, given volume = 15.00 ml
Solution: Molarity of acid after dilution = \frac{15 × 0.10}{100} = 0.015M
As one molecule of HCL release one H+ ion, Molarity of H+ ions will be 0.015 M
So, pH = - log (0.015) = 1.823
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Which of the following notations is the correct noble gas configuration for Li?
O A. 1s²2s¹
OB. 1s22s
C. [He]2s¹
D. [Hel1 s22s¹
The right option is C, the correct noble gas notations for Li is [He] 2s¹.
We know that the atomic number of Li is 3 , so it will have 3 electrons in total, in filling electrons the electronic configuration is came as follows:
1s²2s¹ , but we asked for noble gas electronic configuration , so in this type of way of writing a noble gas configuration , we write by using the most nearer electronic configuration of a noble gas.
Let us see each option in each case,
In option A, it is the normal electronic configuration with no noble gas involved so it will be wrong.In option B, it is 1s²2s , which is 2 electrons only, so it will be wrongIn option C, it is using 2s² for He and the rest one electron for Li is written as 2s¹, so it will be the right answer.In option D, if we look at total number of electrons it will be 5 electrons , so this one will also be wrong.So the correct notation will be [He]2s¹ which is option C.
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Question 1-7
In any chemical reaction, the mass of the reactants equals the mass of the products. This result forms the basis of the Law of
Conservation of Mass. Which statement correctly explains why this is a law, rather than a theory?
The law of conservation of matter says that in chemical reaction and the statement is the total mass of the product must equal the total mass of the reactant
The law of conservation of mass states that the mass in an isolated system is neither created nor destroyed by chemical reaction or physical transformation and according to the law of conservation of mass and the mass of the product in a chemical reaction must equal to the reactant that means total mass of the product must equal the total mass of the reactant
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