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Chemistry 1 practice test 8

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AB CHEMISTRY 1 | PRACTICE TEST SET #7
I. MULTIPLE CHOICES: Shade the letter of the correct answer.
A B C D
1. The per cent by mass of each element present in a compound.
a. per cent composition b. per cent yield
c. balancing d. per cent per atom
2. The simplest or most reduced ratio of atoms in a compound.
a. chemical formula b. molecular formula
c. empirical formula d. geometric formula
3. Tells how many atoms of each element are in a compound
a. chemical formula b. molecular formula
c. empirical formula d. geometric formula
4. Happens between two substances which are able to form chemical bonds to create
one or more entirely new materials.
a. chemical forming b. chemical composition
c. chemical radiation d. chemical reaction
5. Solid which is formed when two liquids are combined and then react? It may either
sink to the bottom or remain suspended within the solution.
a. gas production b. precipitate
c. color d. temperature changes
6. One of the identifying factors of a chemical reaction
a. gas production b. precipitate
c. color d. temperature changes
7. Can be formed when two liquids are combined, or when a solid is added to a
liquid. Generally visible as bubbles rising to the surface of the reaction mixture
a. gas production b. precipitate
c. color d. temperature changes
8. Reactions that gives off heat
a. chemical radiation b. endothermic reaction
c. chemical reaction d. exothermic reaction
9. Reactions that gives absorbs heat
a. chemical radiation b. endothermic reaction
c. chemical reaction d. exothermic reaction
10. Substance that takes part in and undergoes change during a reaction.
a. product b. chemicals
c. reactants d. compound
11. Substance that is formed as the result of a chemical reaction.
a. product b. chemicals
c. reactants d. compound
12. Elements or less complex compounds come together to form a single or more
complex compound.
a. synthesis reaction b. single replacement reaction
c. decomposition reaction d. double replacement reaction
13. Compound breaks apart into either elements or less complex compounds.
a. synthesis reaction b. single replacement reaction
c. decomposition reaction d. double replacement reaction
14. One element that starts out by itself replaces another element in a compound by
kicking it out.
a. synthesis reaction b. single replacement reaction
c. decomposition reaction d. double replacement reaction

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II. LIMITING AND EXCESS REACTANT
For Question 1-4
Consider the following reaction: 3Si + 2N
2
→ Si
3
N
4
1. When 17.61 moles of Si reacts with 22.12 moles of N2, how many moles of Si
3
N
4
are formed?
a. 5.89 moles of Si
3
N
4
c. 5.87 moles of Si
3
N
4
b.
5. 88 moles of Si
3
N
4
d. 5.90 moles of Si
3
N
4
2. What is the limiting reactant?
a. Silicon b. Nitrogen c. Si
3
N
4
d. no limiting reactant
3. What is the excess reactant?
a. Silicon b. Nitrogen c. Si
3
N
4
d. no excess reactant
4. How many moles of excess reactant are left over?
a. 10.40 moles b. 10.39 moles c.10.41 moles d. 10.38 moles
For Question 5-8
Consider the following reaction: 4Li + O
2
→ 2Li
2
O
5. What is the limiting reactant?
a. oxygen b. lithium c. lithium oxide d. no limiting reactant
6. What is the excess reactant?
a. oxygen b. lithium c. lithium oxide d. no excess reactant
7. How many moles of excess reactant are left over?
a. 6.56 moles b. 6.57 moles c. 6.59 moles d. 6.55 moles
8. When 15.41 moles of Li reacts with 10.41 moles of O
2
, how many moles of Li
2
O are formed?
a. 7.72 moles of Li
2
O c. 7.74 moles of Li
2
O
b. 7.73 moles of Li
2
O d. 7.71 moles of Li
2
O
For Question 9-12
Consider the following reaction: CaO + H
2
O → Ca (OH)
2
9. When 7.56 moles of H
2
O reacts with 13.11 moles of CaO, how many moles Ca(OH)
2
of are
formed?
15. Ions in a compound switch places with ions in another compound to form new
compounds.
a combustion reaction b. single replacement reaction
c. decomposition reaction d. double replacement reaction
16. A compound containing carbon and hydrogen (and sometimes oxygen) combines
with oxygen gas to produce carbon dioxide and water.
a combustion reaction b. single replacement reaction
c. decomposition reaction d. double replacement reaction
17. What type of chemical reaction is CH
4
+ O
2
CO
2
+ H
2
O
a double replacement b. single replacement
c. combustion reaction d. double replacement
18. Which of the following is the balanced equation when nitrogen gas reacts with
hydrogen gas?
a. N
2
+ 2H
2
NH
3
b. N
2
+ 3H
2
2NH
3
c. N
2
+ H
2
NH
3
d. N
2
+ 4H
2
NH
3

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AB CHEMISTRY 1 | PRACTICE TEST SET #7 I. MULTIPLE CHOICES: Shade the letter of the correct answer. 1. The per cent by mass of each element present in a compound. a. per cent composition b. per cent yield A B C D c. balancing d. per cent per atom 2. The simplest or most reduced ratio of atoms in a compound. a. chemical formula b. molecular formula c. empirical formula d. geometric formula 3. Tells how many atoms of each element are in a compound a. chemical formula b. molecular formula c. empirical formula d. geometric formula 4. Happens between two substances which are able to form chemical bonds to create one or more entirely new materials. a. chemical forming b. chemical composition c. chemical radiation d. chemical reaction 5. Solid which is formed when two liquids are combined and then react? It may either sink to the bottom or remain suspended within the solution. a. gas production b. precipitate c. color d. temperature changes 6. One of the identifying factors of a chemical reaction a. gas production b. precipitate c. color d. temperature changes 7. Can be formed when two liquids are combined, or when a solid is added to a liquid. Generally visible as bubbles rising to the surface of the reaction mixture a. gas production b. precipitate c. color d. temperature changes 8. Reactions that gives off heat a. chemical radiation b. endothermic reaction c. chemical reaction d. exothermic reaction 9. Reactions that gives absorbs heat a. chemical radiation b. endothermic react ...
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