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Gen Chem I Exam 2 review sum08

Gen Chem I Exam 2 review sum08 - 1 General Chemistry I Exam...

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1 General Chemistry I Exam 2 Review ____ 1. Balancing a chemical equation so that it obeys the law of conservation of matter requires: a. Adjusting the coefficients in front of the formulas so there are the same number and type of atom on both sides of the equation. d. Changing the formulas of the products and reactants. b. Making sure the reactants and products are in the same phase. e. Keeping the same number of molecules on both sides of the equation. c. Keeping the total charge the same on both sides of the equation. ____ 2. Balance the following equation with the smallest whole number coefficients . What is the coefficient for O 2 in the balanced equation? C 4 H 9 SO + O 2 CO 2 + SO 2 + H 2 O a. 54 d. 32 b. 29 e. 27 c. 23 ____ 3. Balance the following equation with the smallest whole number coefficients . What is the coefficient for H 2 O in the balanced equation? LiBF 4 + H 2 O H 3 BO 3 + HF + LiF a. 3 d. 6 b. 2 e. 8 c. 5 ____ 4. When heated lead nitrate decomposes according to the following equation. What is the coefficient for NO 2 when the this equation is balanced with the smallest whole number coefficients ? Pb(NO 3 ) 2 PbO + O 2 + NO 2 ____ 5. Balance the following equation with the smallest whole number coefficients . Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". Cr + H 2 SO 4 Cr 2 (SO 4 ) 3 + H 2 ____ 6. Balance the following equation with the smallest whole number coefficients . Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". CuSO 4 + NH 3 + H 2 O (NH 4 ) 2 SO 4 + Cu(NH 3 ) 4 (OH) 2
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2 ____ 7. Ammonium nitrate fertilizer is sometimes used as an explosive. How many moles of water can be formed from the decomposition of 13.2 moles of ammonium nitrate? a. 6.60 d. 13.2 b. 14.0 e. 18.0 c. 26.4 ____ 8. Propane (C 3 H 8 ) burns in oxygen to form CO 2 and H 2 O according to the following equation. How many grams of O 2 are required to burn 3.01 × 10 23 propane molecules? C 3 H 8 + O 2 CO 2 + H 2 O ____ 9. How many grams of magnesium are required to produce 5.000 kg of Si? SiCl 4 + Mg Si + MgCl 2 ____ 10. What mass of phosphoric acid, H 3 PO 4 , would actually react with 7.17 grams of LiOH? LiOH + H 3 PO 4 Li 3 PO 4 + H 2 O
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