ch10 chemical reactions
DESCRIPTION
Chemical reactions, physical science, ch 10,TRANSCRIPT
ch10Student: ___________________________________________________________________________ 1. The empirical formula gives the actual number of atoms of each kind in a compound. True False
2. In a chemical equation, the reactants are found on the left side of the arrow. True False
3. When balancing a chemical equation, you need to change subscripts to make the number of atoms of an element the same on both sides of the equation. True False
4. When compounds containing carbon and hydrogen are burned in air, the products are usually carbon dioxide and water. True False
5. Substances that lose electrons in reactions are called oxidizing agents. True False
6. In combination reactions, elements react to form compounds. True False
7. When balancing a chemical equation, the number of H atoms in 2 CH4 is eight. True False
8. A decomposition reaction always breaks down a compound into the elements that make up the compound. True False
9. Chemists effectively count atoms by weighing matter. True False
10. The sum of the coefficients must be the same on both sides of a chemical equation. True False
Consider the chemical equation: CH4 + 2O2 CO2 + 2H2O
11. What is the number of atoms on each side of the equation? A. 5 B. 6 C. 7 D. 9
12. What is the formula weight of methane, CH4? A. 13 u B. 16 u C. 52 u D. None of the above.
13. What is the total mass of products in the methane reaction shown before question 11? A. 80 u B. 64 u C. 62 u D. 48 u
14. What is the empirical formula of C4H8? A. CH B. CH2 C. C4H8 D. C2H4
15. The reaction 2 Mg + O2 2 MgO is an example of A. oxidation. B. combination. C. combustion. D. All of the above.
16. When the equation __Li + __O2 __Li2O is correctly balanced, what is the sum of the coefficients? A. 3 B. 5 C. 7 D. 12
17. The reaction: 2 NaI + Cl2 2 NaCl + I2 is an example of A. decomposition. B. combination. C. replacement. D. ion exchange.
18. The reaction: potassium chlorate A. decomposition. B. combination. C. replacement. D. ion exchange.
potassium chloride and oxygen gas is an example of
19. A chemical reaction is balanced by changing (the) A. subscripts. B. superscripts. C. coefficients. D. Any of the above as needed.
20. What is the number of oxygen atoms in Al2(SO4)3? A. 3 B. 4 C. 7 D. 12
21. The equation 2 C2H5OH + __O2 4 CO2 + 6 H2O is balanced by making the coefficient of oxygen A. 14. B. 12. C. 7. D. 6.
22. An oxidizing agent is a substance that A. reacts with oxygen. B. removes electrons from another substance. C. supplies electrons to another substance. D. frees a metal from its ore.
23. What is the formula weight of aluminum hydroxide, Al(OH)3? A. 44 u B. 45 u C. 75 u D. 78 u
24. What is the mass percent of sodium in washing soda, Na2CO3? A. 43.4% B. 32.5% C. 21.7% D. 62.1%
25. What is the total number of atoms in calcium phosphate, Ca3(PO4)2? A. 8 B. 9 C. 11 D. 13
26. What is the mass of 0.50 mole of baking soda, NaHCO3? A. 26 g B. 42 g C. 84 g D. 168 g
27. How many molecules are in a 8.0-g sample of oxygen gas, O2? A. 6.0 1023 B. 3.0 1023 C. 1.5 1023 D. 12.0 1023
28. Which of the following is a sign of an ion exchange reaction? A. a precipitate is formed B. a compound is broken down into simpler substances C. a reactant is oxidized D. a metal ion is reduced
29. The reaction between water solutions of sodium chloride and silver nitrate produces a precipitate: NaCl(aq) + AgNO3(aq) NaNO3(aq) + AgCl(s). This is an example of A. decomposition. B. combination. C. replacement. D. ion exchange.
30. Because of our belief in the law of conservation of mass, it seems reasonable that A. in combustion reactions, part of the mass of the reactants must be converted into fire. B. the mass of a newly formed compound cannot be changed. C. molecules cannot be broken down, for the mass would be reduced. D. the number of atoms of reactants must equal the number of atoms of products.
ch10 Key
1. The empirical formula gives the actual number of atoms of each kind in a compound. FALSE
Blooms Level: 2. Understand Section: 10.01 Tillery - Chapter 10 #1 Topic: Chemical Formulas
2. In a chemical equation, the reactants are found on the left side of the arrow. TRUE
Blooms Level: 2. Understand Section: 10.02 Tillery - Chapter 10 #2 Topic: Chemical Equations
3. When balancing a chemical equation, you need to change subscripts to make the number of atoms of an element the same on both sides of the equation. FALSE
Blooms Level: 3. Apply Section: 10.02 Tillery - Chapter 10 #3 Topic: Chemical Equations
4. When compounds containing carbon and hydrogen are burned in air, the products are usually carbon dioxide and water. TRUE
Blooms Level: 4. Analyze Section: 10.03 Tillery - Chapter 10 #4 Topic: Chemical Reactions
5. Substances that lose electrons in reactions are called oxidizing agents. FALSE
Blooms Level: 2. Understand Section: 10.03 Tillery - Chapter 10 #5 Topic: Chemical Reactions
6. In combination reactions, elements react to form compounds. FALSE
Blooms Level: 2. Understand Section: 10.03 Tillery - Chapter 10 #6 Topic: Chemical Reactions
7. When balancing a chemical equation, the number of H atoms in 2 CH4 is eight. TRUE
Blooms Level: 3. Apply Section: 10.02 Tillery - Chapter 10 #7 Topic: Chemical Equations
8. A decomposition reaction always breaks down a compound into the elements that make up the compound. FALSE
Blooms Level: 4. Analyze Section: 10.03 Tillery - Chapter 10 #8 Topic: Chemical Reactions
9. Chemists effectively count atoms by weighing matter. TRUE
Blooms Level: 3. Apply Section: 10.04 Tillery - Chapter 10 #9 Topic: Chemical Equations
10. The sum of the coefficients must be the same on both sides of a chemical equation. FALSE
Blooms Level: 4. Analyze Section: 10.02 Tillery - Chapter 10 #10 Topic: Chemical Equations
Consider the chemical equation: CH4 + 2O2 CO2 + 2H2O
Tillery - Chapter 10
11. What is the number of atoms on each side of the equation? A. 5 B. 6 C. 7 D. 9
Blooms Level: 3. Apply Section: 10.02 Tillery - Chapter 10 #11 Topic: Chemical Equations
12. What is the formula weight of methane, CH4? A. 13 u B. 16 u C. 52 u D. None of the above.
Blooms Level: 4. Analyze Section: 10.01 Tillery - Chapter 10 #12 Topic: Chemical Formulas
13. What is the total mass of products in the methane reaction shown before question 11? A. 80 u B. 64 u C. 62 u D. 48 u
Blooms Level: 4. Analyze Section: 10.04 Tillery - Chapter 10 #13 Topic: Chemical Equations
14. What is the empirical formula of C4H8? A. CH B. CH2 C. C4H8 D. C2H4
Blooms Level: 3. Apply Section: 10.01 Tillery - Chapter 10 #14 Topic: Chemical Formulas
15. The reaction 2 Mg + O2 2 MgO is an example of A. oxidation. B. combination. C. combustion. D. All of the above.
Blooms Level: 4. Analyze Section: 10.03 Tillery - Chapter 10 #15 Topic: Chemical Reactions
16. When the equation __Li + __O2 __Li2O is correctly balanced, what is the sum of the coefficients? A. 3 B. 5 C. 7 D. 12
Blooms Level: 4. Analyze Section: 10.02 Tillery - Chapter 10 #16 Topic: Chemical Equations
17. The reaction: 2 NaI + Cl2 2 NaCl + I2 is an example of A. decomposition. B. combination. C. replacement. D. ion exchange.
Blooms Level: 4. Analyze Section: 10.03 Tillery - Chapter 10 #17 Topic: Chemical Reactions
18. The reaction: potassium chlorate A. decomposition. B. combination. C. replacement. D. ion exchange.
potassium chloride and oxygen gas is an example of
Blooms Level: 4. Analyze Section: 10.03 Tillery - Chapter 10 #18 Topic: Chemical Reactions
19. A chemical reaction is balanced by changing (the) A. subscripts. B. superscripts. C. coefficients. D. Any of the above as needed.
Blooms Level: 2. Understand Section: 10.02 Tillery - Chapter 10 #19 Topic: Chemical Equations
20. What is the number of oxygen atoms in Al2(SO4)3? A. 3 B. 4 C. 7 D. 12
Blooms Level: 3. Apply Section: 10.01 Tillery - Chapter 10 #20 Topic: Chemical Formulas
21. The equation 2 C2H5OH + __O2 4 CO2 + 6 H2O is balanced by making the coefficient of oxygen A. 14. B. 12. C. 7. D. 6.
Blooms Level: 4. Analyze Section: 10.02 Tillery - Chapter 10 #21 Topic: Chemical Equations
22. An oxidizing agent is a substance that A. reacts with oxygen. B. removes electrons from another substance. C. supplies electrons to another substance. D. frees a metal from its ore.
Blooms Level: 2. Understand Section: 10.03 Tillery - Chapter 10 #22 Topic: Chemical Reactions
23. What is the formula weight of aluminum hydroxide, Al(OH)3? A. 44 u B. 45 u C. 75 u D. 78 u
Blooms Level: 3. Apply Section: 10.01 Tillery - Chapter 10 #23 Topic: Chemical Formulas
24. What is the mass percent of sodium in washing soda, Na2CO3? A. 43.4% B. 32.5% C. 21.7% D. 62.1%
Blooms Level: 3. Apply Section: 10.01 Tillery - Chapter 10 #24 Topic: Chemical Formulas
25. What is the total number of atoms in calcium phosphate, Ca3(PO4)2? A. 8 B. 9 C. 11 D. 13
Blooms Level: 4. Analyze Section: 10.01 Tillery - Chapter 10 #25 Topic: Chemical Formulas
26. What is the mass of 0.50 mole of baking soda, NaHCO3? A. 26 g B. 42 g C. 84 g D. 168 g
Blooms Level: 4. Analyze Section: 10.04 Tillery - Chapter 10 #26 Topic: Chemical Equations
27. How many molecules are in a 8.0-g sample of oxygen gas, O2? A. 6.0 1023 B. 3.0 1023 C. 1.5 1023 D. 12.0 1023
Blooms Level: 4. Analyze Section: 10.04 Tillery - Chapter 10 #27 Topic: Chemical Equations
28. Which of the following is a sign of an ion exchange reaction? A. a precipitate is formed B. a compound is broken down into simpler substances C. a reactant is oxidized D. a metal ion is reduced
Blooms Level: 3. Apply Section: 10.03 Tillery - Chapter 10 #28 Topic: Chemical Reactions
29. The reaction between water solutions of sodium chloride and silver nitrate produces a precipitate: NaCl(aq) + AgNO3(aq) NaNO3(aq) + AgCl(s). This is an example of A. decomposition. B. combination. C. replacement. D. ion exchange.
Blooms Level: 4. Analyze Section: 10.03 Tillery - Chapter 10 #29 Topic: Chemical Reactions
30. Because of our belief in the law of conservation of mass, it seems reasonable that A. in combustion reactions, part of the mass of the reactants must be converted into fire. B. the mass of a newly formed compound cannot be changed. C. molecules cannot be broken down, for the mass would be reduced. D. the number of atoms of reactants must equal the number of atoms of products.
Blooms Level: 4. Analyze Section: 10.04 Tillery - Chapter 10 #30 Topic: Chemical Equations
ch10 SummaryCategory Blooms Level: 2. Understa nd Blooms Level: 3. Apply Blooms Level: 4. Analyze Section: 10.01 Section: 10.02 Section: 10.03 Section: 10.04 Tillery - Chapter 10 Topic: Chemical Equations Topic: Chemical Formulas Topic: Chemical Reactions # of Questio ns 6 9 15 7 8 10 5 31 13 7 10