Chapter 8 and Chapter 9 Worksheets

Chapter 8 and Chapter 9 Worksheets - CHE 117 Chemistry and...

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CHE 117 – Chemistry and the Modern World Chapter 8 – Worksheet 1. For the equation, 2 NaN3(s) --> 2 Na(s) + 3 N2(g), which statement is false? a. the equation is balanced b. the products are sodium and nitrogen c. the sum of all coefficients is 7 d. the products are all in the same state of matter 2. Which is necessary for a chemical reaction to occur? a. reactant molecules must collide b. collisions must be of a certain energy c. neither a nor b d. both a and b 3. A catalyst speeds up a reaction rate because it a. raises the reaction temperature b. provides an alternate lower energy pathway c. increases the energy of reactants d. removes products from the reaction mixture 4. Which is not a statement of the First Law of Thermodynamics? a. energy can be converted from one form to another b. things are getting more screwed up every day c. there's no such thing as a free lunch d. you can't get something for nothing 5. Which will increase the rate of a reaction? a. increasing temperature b. increasing temperature and concentration c. increasing temperature and surface area d. all of these 6. If you add more CO2(g) to an equilibrium mixture of CaCO3(s), CaO(s) and CO2(g) in a hot closed vessel, which way would you expect the equilibrium to shift ?
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CaCO3(s) <----> CaO(s) + CO2(g) a. to form more reactant b. to form more product c. no change d. indeterminable based in information given 7. What is the molar mass of H2SO4? a. 50 b. 49 c. 98 d. 7 For questions 8 and 9, consider the equation below. Zinc will react with a solution of hydrochloric acid to produce hydrogen gas: Zn(s) + 2 HCl(aq) ---> ZnCl2(s) + H2(g) 8. How many moles of hydrochloric acid react with one mole of zinc? a. 1 b. 2 c. between 1 and 2 depending on how much hydrogen gas is formed d. the same number as the number of moles of hydrogen produced 9. What weight of ZnCl2 will be produced from 1.00 mole of Zn? a. 65.4 g
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Chapter 8 and Chapter 9 Worksheets - CHE 117 Chemistry and...

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