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30 Cards in this Set
- Front
- Back
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According to the following balanced chemical equation, if you need to generate two moles of H2O how many grams of O2 do you need? |
32 |
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The atomic masses appearing in the periodic table are_____________ masses Absolute Relative Standard deviation Formula |
Relative |
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What is the mass of one mole of H2? 2g 1g 20g 6.022 x 10 to the 23 |
2g |
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Balance the following chemical equation: _____N2 + ______H2=_______NH3 1,3,2 1,2,3 3,2,1 2,6,4 1/2, 3/2, 1 |
1,3,2 |
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How many grams of gallium are here in 145g sample of gallium arenside, GaAs? 74.9g 69.7g 145g 6.02 x 10 to the 23g |
69.7g |
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There are 1000 liters in 1 cubic meter and 1000 grams in 1 kilogram. How many grams of air are there in 0.01 liters of air? (Assume a density of 1.25kg/L.) 0.00125g 0.125g 1.25g 12.5g |
12.5g |
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Given that the bond energy of N2 is 946 k/j mole, the bond energy of O2 is 498 ok/mole and the NO bond energy is 631 ok/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction: N2 + O2 = 2NO 182 kj -182 kj 813 kj -813 kj |
-182kj |
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Seven grams of nitrogen, N2, (N, atomic mass 14 amu) contains__________. 1 mole of nitrogen atoms 0.5 mole of nitrogen atoms 0.25 moles of nitrogen atoms Not enough information is given |
0.5 moles of nitrogen atoms |
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Chlorine is put into the atmosphere by volcanos in the form of hydrogen chloride, HCL, but this form of chlorine does not remain in the atmosphere for very long. Why? ▪️The hydrogen chloride Is destroyed by ultraviolet rays ▪️The hydrogen chloride is washed away by atmospheric moisture ▪️The hydrogen chloride reacts with atmospheric carbon dioxide ▪️The hydrogen chloride degenerates into hydrogen and chlorine |
The hydrogen chloride is washed away by atmospheric moisture |
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What is the number of grams of CO2 produced if you combust 0.50 mole of CH4 according to the following balanced equation: CH4 + 2 O2 = CO2 + 2 H2O 22g 10g 44g 32g |
22g |
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What is the formula mass of a molecule of C6H12O6? 180amu 24amu 29amu 168amu |
180amu |
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Why is heat often added to chemical reactions performed in the laboratory? |
All of the above |
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How does a catalyst increase the rate of a reaction? ▪️it lowers the activation energy ▪️ it neither is created nor consumed in a reaction ▪️ it has nothing to do with he rate of reaction ▪️ it increases the energy difference between the reactants and products |
It lowers the activation energy |
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What is an endothermic reaction? ▪️it is a reaction that requires heat as a reactant ▪️it is a reaction where the products have more energy than the reactants ▪️it is a reaction where there is a net adsorption of energy from a reaction ▪️all of the above |
Al of the above |
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It takes energy to break bonds and you gain energy in the formation of bonds, how can some reactions be exothermic while other are endothermic? ▪️it is the total amount of energy that matters. Sometimes some bonds are stronger than others and so you gain or lose energy when you form them. ▪️it is he total number of bonds that matter. Sometimes you create more bonds than you break and since all bonds have the same amount of energy you gain or lose energy depending on the number of bonds ▪️some reactants have more energetic bonds than others and they will always release energy ▪️ some products have more energy than others and they always require energy to be formed |
It is the total amount of energy that matters. Sometimes some bonds are stronger than others so you gain or lose energy when you form them. |
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Assume air has an average molar mass of 28grsms/mole, and determine how many moles of air molecules are in 1.0 liters of air, which consists of 1.26 grams of air molecules. 28 moles 0.45 mole 0.045 mole 22.4 moles |
0.045 mole |
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How many grams of water can be formed from the reaction between 10 grams of oxygen and 1 gram of hydrogen? ▪️11 grams of water are formed since mass must be conserved ▪️10 grams of water are formed since you can't get a greater mass of water produced than oxygen reacting ▪️9 grams of water are formed because oxygen and hydrogen ready in an 8:1 ratio ▪️no water is formed because there is insufficient hydrogen to react with the oxygen |
9 grams of water are formed because oxygen and hydrogen react in an 8:1 ratio |
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If it takes 3 carbon atoms to equal the mass of one chlorine atom, what mass of chlorine do you need to equal the number of atoms in one kilogram of carbon? 1/3 of a kg 30 kg 1 kg 3 kg |
3 kg |
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What is the number of moles of H2O produced if you combust 0.5 mole of CH4 according to the following balanced equation: CH4 + 2 O2 = CO2 + 2 H2O 2 moles 4 moles 6 moles 8 moles 1 mole |
1 mole |
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How many grams of water, H2O, can be produced by the reaction of 8 grams of oxygen, O2, and 8 grams of hydrogen, H2? 16g 10g 9g 8g |
9g |
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How is Avogadro's number related to the numbers on the periodic table? ▪️the atonic mass listed is the mass of Avogadro's worth of atoms ▪️the masses are all divisible by Avogadro's number, which gives you the weight of one mole ▪️the periodic table tells you the mass of one atom. From that, and Avogadro's number you know the number of moles ▪️the periodic table only gives us atomic numbers, not atomic mass |
The atomic mass listed is the mass of Avogadro's number's worth of atoms |
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Which of the following has the greatest number of particles? 1 mole of Na 22.990g of Na 1 mole of Be 9.012g of Be All are the same |
All are the same |
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How many oxygen molecules are needed to make 10 carbon dioxide molecules according to the flowering chemical equation? 5 1 4 10 |
5 |
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What is the formula mass of a molecule of CO2 44amu 56amu 58.9amu 118amu |
44 amu |
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Bond energies increase in going from C-N (lowest) to C-O to C-F (highest). Explain this trend based upon the atomic sizes of these atoms as deduced from their positions in the periodic table. |
In going from nitrogen to oxygen to fluorine the atoms get smaller. This means that the bonding atoms are closer together, which translates into a greater bond energy. |
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How many grams of water, H2O, can be produced from the reaction of 25.0 grams of hydrogen, H2, and 225 grams of oxygen, O2? 250g 225g 200g 25g |
225g |
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The relative mass of carbon is 3/8 that of an oxygen molecule. How many grams of carbon are needed to have the same number of particles as found in 32 grams of oxygen molecules? 12g 32g 3g 8g |
12g |
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How many bonds (in total) between nitrogen and hydrogen are formed if you ready nitrogen with hydrogen according to the following reaction? 1 4 3 6 8 |
6 |
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According to the following balanced equation, if you want to generate two moles of H2O; how many molecules of O2 do you need?
1 2 1/2 4 6.022 x 10 to the 23 |
6.022 x 10 to the 23 |
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Which has more atoms: 17.031g of ammonia, NH3 (17.032 amu), or 73.922 g of hydrogen chloride, HCL (36.461 amu)?
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They have about the same |
