Honors Chemistry
Practice Test Unit 4
Name _________________________
Class ________ Date _________
Write a balanced chemical equation for questions 1-5. Include state of matter for each reactant and product.
1. Double replacement reaction of aqueous chromium (III) acetate and aqueous silver nitrate.
2. Decomposition reaction of solid aluminum carbonate.
3. Synthesis reaction of sodium metal and nitrogen gas.
4. Single replacement reaction of solid barium metal and aqueous aluminum nitride.
5. Combustion reaction of octane (C8H18).
Balance and then classify each of the following reactions as single or double replacement, decomposition, synthesis,
combustion.
6. ___CuO + ___H2 ® ___Cu + ___H2O
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7. ___NaClO3  ___NaCl + ___O2
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8. ___C4H8 + ___O2  ___CO2 + ___H2O
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9. ___Al + ___Br2 ® ___AlBr3
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10. ___Fe(OH)2  ___FeO + ___H2O
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11. ___Ga + ___O2  ___Ga2O3
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12. A compound in the lab is found to contain 7.2 x1024 atoms of oxygen, 56.0 g of nitrogen, and 4.0 moles of
hydrogen. What is it’s empirical formula?
13. Cisplatin has the following composition: 65.02g platinum, 9.34g nitrogen, 2.02g hydrogen, and 23.63g chlorine.
Calculate the %composition for cisplatin.
14. A chemist analyzing a compound finds that it contains .8007 g of carbon, .9333 g of nitrogen, .2016 g of
hydrogen and 2.133 g of oxygen. Determine the empirical formula.
15. A compound used as an additive for gasoline to help prevent engine knock shows the following %composition:
71.65% Cl, 24.27% C and 4.07% H. The molecular mass is 98.96 g. Determine the molecular formula.
Consider the following unbalanced reaction for questions 16-19:
___NH3 + ___O2  ___NO + ___H2O
16. How many moles of nitrogen monoxide can be produced from .75 moles of oxygen?
17. How many molecules of water can be produced from 20.0 g of NH3?
18. How many grams of water are produced from 50.0 g of NH3?
19. How many molecules of oxygen are required to react with 2.5 x1024 molecules of ammonia?
20. Aqueous solutions of barium nitrate and ammonium carbonate react in a double replacement reaction.
a) Predict the products and write a balanced chemical reaction including states of matter.
b) How many mole of ammonium nitrate will be produced from 110.0 g of ammonium carbonate?
c) How many moles of barium carbonate would be produced from 6 moles of ammonium carbonate?
d) How many grams of barium nitrate are needed to react with 220.0 g of ammonium carbonate?
21. Caproic acid, responsible for the odor of dirty socks, is composed of C, H, and O atoms. Combustion of a 0.225 g
sample of this compound produces 0.512 g CO2 and 0.209 g H2O.
a) What is the empirical formula of caproic acid?
b) Caproic acid has a molar mass of 116 g/mol. What is its molecular formula?