Name:____________________________________ Date ...
Name:____________________________________ Date:_____________________ Per:_____
REVIEW: 2nd Nine Weeks
9 weeks testing schedule:
Dec. 14 (Wed.) Periods: 3A & 4A
Dec. 15 (Thurs.) Periods: 1B, 2B, 3B, 4B
Dec. 16 (Fri() Periods: 1A & 2A
Part I: Molar Mass and Conversions Directions: On a separate sheet of paper, show all work, round to the nearest hundredth, include correct units after each answer, and box all answers.
Molar Mass
1. The ________ __________ of an elements is the mass of one mole of that element.
2. Calculate the molar mass of sodium hydroxide, NaOH. Round to the nearest hundredth and include the correct unit.
3. Calculate the molar mass for Oxygen (O2). Round to the nearest hundredth and include the correct unit.
4. Calculate the molar mass of aluminum nitrate, Al(NO3)3. Round to the nearest hundredth and include the correct unit.
5. Calculate the molar mass of carbon monoxide, CO. Round to the nearest hundredth and include the correct unit.
Conversions
6. Determine the mass in grams of 2.75 x 103 moles of Br2 .
7. How many moles of CO2 are in 410.00g ?
8. Calculate the number of molecules in 4.00 moles of H2O.
9. How many moles are there in a sample containing 3.407 x 1024 atoms of Nitrogen?
10. How many grams are in 8.20 x 1035 atoms of Iron (Fe)?
Part II: Law of Conservation of Mass and Balancing Equations
Law of Conservation of Mass:
11. Does the following equation obey the law of conservation of mass? Why or Why Not?
2 Al + 3 O2 → 2 Al(NO3)3
If it does not, fix it so that it does obey the law of conservation of mass.
12. According to the law of conservation of mass, the mass of the reactants must equal the total mass of the ________________________________.
13. If the mass of sodium chloride reacted is 191 grams and calcium hydroxide 74 grams and 80 grams of sodium hydroxide is produced, what mass of calcium chloride is produced? ________________ 2 NaCl + Ca(OH)2 → CaCl2 + 2 NaOH
14. Explain what was done in the “Law of Conservation of Mass Lab” in order to show that mass was conserved in a reaction that produced a gas, such as carbon dioxide, in the product._______________________________________________________________________________________________________________________________________________
15. Which chemical equation supports the law of conservation of mass? _______________________
A. 2H2O(l) (H2 (g) + O2 (g) C. CH4 (g) + 2O2 (g) (CO2 (g) + 2H2O(g)
B. Zn(s) + HCl(aq) ( ZnCl2 (aq) + H2 (g) D. Al4C3(s) + H2O(l) ( CH4(g) + Al(OH) 3(s)
Balancing Equations
16. What are the coefficents that balance the following equation:
______ AlCl3 + ______ Ba(NO3)2 → ______ BaCl2 + ______ Al(NO3)3
17. Which additional product balances this equation?
2 C5H10 + 15 O 2 → ______+ 10 H2O
A. 5 CO B. 10 H2O2 C. 10 CO2 D. 3 OH
18. What is the coefficient for Al when the following equation is balanced?
______ Al (s) + ______ Br2 (l) → ______ AlBr3 (s)
19. Balance: ____ Mg (s) + ___ AgNO3 (aq) → ___ Mg(NO3)2 (aq) + ___ Ag (s)
20. Balance: ______ K2O (s) + ______ H2O (l) → ______ KOH (s)
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