HONORS & CP CHEMISTRY
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HONORS & CP CHEMISTRY
MID TERM EXAM REVIEW
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1. How many atoms of hydrogen are present in 3 moles of acetic acid?
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1. How many atoms of hydrogen are present in 3 moles of acetic acid?
3 mol HAc(4 moles H/1 mol HAc) = 12 mol H atoms12 mol H atoms (6.02 X 1023atoms/1mol)= 7.22 X 1024atoms
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2. What is the molecular formula of butane?
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2. What is the molecular formula of butane?
C4H10
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3. How many moles of carbon are present in 2 moles of butane?
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3. How many moles of carbon is present in 2 moles of butane?
2 mol butane (4 mol C/1 mol butane) = 8 mol C
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4. What is the percent composition of ethanol?
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4. What is the percent composition of ethanol?First find GFM:2C = 24.06H = 6.01O = 16.00
46 g/mol
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4. - continued What is the percent composition of ethanol?
%C = 24.0/46 (100)= 52% %H = 6.0/46 (100) =13%%O = 16.00/46(100) = 35%
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5. Classify the reactions shown below
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5.Classify the reactions shown below
Decomposition
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5. Classify the reactions shown below
Decomposition
Double replacement
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5. Classify the reactions shown below
Decomposition
Double replacement
Synthesis
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5. Classify the reactions shown below
Decomposition
Single replacement
Synthesis
Double replacement
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6. What number should be written in front of Na to balance the
equationNa + Cl2 NaCl ?
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6. What number should be written in front of Na to balance
the equationNa + Cl2 NaCl ?
2
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7. What number should be written in front of Fe in order to
balanceFe + O2 Fe2O3?
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7. What number should be written in front of Fe in order to
balanceFe + O2 Fe2O3?
4
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8.Measure the object with the ruler to the correct number of
significant figures.
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8. Measure the object with the ruler to the correct number of significant figures. 11.65 cm
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9. Classify each as accurate &/ or precise
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9. Classify each as accurate &/ or precise
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10. What symbol expresses uncertainty in a measurement?
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10. What symbol expresses uncertainty in a measurement?
+/-
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11. Name the compound S3O6
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11. Name the compound S3O6
Trisulfur hexoxide
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12. What is the formula for the compound that is formed by magnesium and hydroxide ions?
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12. What is the formula for the compound that is formed by magnesium and hydroxide ions?
Mg(OH)2
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13. What is the formula for the compound that will form between calcium and phosphate ions?
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13. What is the formula for the compound that will form between calcium and phosphate ions?
Ca3(PO4)2
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14. What is the correct formula for barium oxide?
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14. What is the correct formula for barium oxide?
BaO
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15. What is the volume of a mole of gas at STP?
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15. What is the volume of a mole of gas at STP?
22.4 L
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16. In a chemical reaction, the total mass of the products compared to the total mass of the reactants is
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16. In a chemical reaction, the total mass of the products compared to the total mass of the reactants is
always the same
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17. Calculate the number of atoms in 1.40 mol of Ag.
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17. Calculate the number of atoms in 1.40 mol of Ag.
1.40 mol (6.02 X 10 23 atoms)
1 mol
= 8.43 X 10 23 atoms
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18. Calculate the number of liters of gas in 1.47 mols at STP
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18. Calculate the number of liters of gas in 1.47 mols at STP
1.47 mol (22.4 L)
1 mol
= 32.9 L
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19. In the formula Ca3(PO4)2, the total number of oxygen atoms is
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19. In the formula Ca3(PO4)2, the total number of oxygen atoms is
2 X 4 = 8 oxygen atoms
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20. In the formula 3 Mg(NO3)2, the total number of oxygen atoms is
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20. In the formula 3 Mg(NO3)2, the total number of oxygen atoms is
3 (3 X 2) = 18 oxygen atoms
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21. In the formula 3 Mg(NO3)2, the total number of atoms is
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21. In the formula 3 Mg(NO3)2, the total number of atoms is 3 (3 X 2) = 18 oxygen atoms
3 X 2 = 6 N atoms
+ 3 Mg atoms
= 27 total atoms
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22. In the expression 3Mg(NO3)2, the number 2 is known as
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22. In the expression 3Mg(NO3)2, the number 2 is known as the ______.
subscript
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23. In the expression 6 Ca3(PO4)2, the 6 is known as the
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23. In the expression 6 Ca3(PO4)2, the 6 is known as the _____.
coefficient
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24. What is the name of the Law that directs us to balance equations?
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24. What is the name of the Law that directs us to balance equations?
The Law of Conservation of Matter
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25. When oxygen is available, nitrogen dioxide is produced from the burning of nitrogen. Write the word equation for this reaction.
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25. When oxygen is available, nitrogen dioxide is produced from the burning of nitrogen. Write the word equation for this reaction.
nitrogen + oxygen nitrogen dioxide
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26. Give two examples of a chemical change.
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26. Give two examples of a chemical change.
Souring milk, burning anything, cooking, decaying leaves…
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27. Classify each of the following reactions:2 Mg + O2 2MgO
CH4 + O2 CO2 + 2 H2O
AgNO3 + NaCl NaNO3 + AgCl
H2O H2 + O2
AgCl + Cu CuCl + Ag
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27. Classify each of the following reactions:2 Mg + O2 MgO synthesis
CH4 + O2 CO2 + 2 H2O
AgNO3 + NaCl NaNO3 + AgCl
H2O H2 + O2
AgCl + Cu CuCl + Ag
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27. Classify each of the following reactions:2 Mg + O2 MgO synthesis
CH4 + O2 CO2 + 2 H2O combustion
AgNO3 + NaCl NaNO3 + AgCl
H2O H2 + O2
AgCl + Cu CuCl + Ag
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27. Classify each of the following reactions:2 Mg + O2 MgO synthesis
CH4 + O2 CO2 + 2 H2O combustion
AgNO3 + NaCl NaNO3 + AgCl double replacement
H2O H2 + O2
AgCl + Cu CuCl + Ag
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27. Classify each of the following reactions:2 Mg + O2 MgO synthesis
CH4 + O2 CO2 + 2 H2O combustion
AgNO3 + NaCl NaNO3 + AgCl double replacement
H2O H2 + O2 decomposition
AgCl + Cu CuCl + Ag single replacement
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27. Classify each of the following reactions:2 Mg + O2 MgO synthesis
CH4 + O2 CO2 + 2 H2O combustion
AgNO3 + NaCl NaNO3 + AgCl double replacement
H2O H2 + O2
AgCl + Cu CuCl + Ag single replacement
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27. Classify each of the following reactions:2 Mg + O2 MgO synthesis
CH4 + O2 CO2 + 2 H2O combustion
AgNO3 + NaCl NaNO3 + AgCl double replacement
H2O H2 + O2 decomposition
AgCl + Cu CuCl + Ag single replacement
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28. Balance each of the following equations
a. NaCl Na + Cl2
b. S + Cl2 SCl2
c. K + AgCl Ag + KCl
d. Ca(OH)2 + HCl H2O + CaCl2
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28. Balance each of the following equations
a. 2 NaCl 2 Na + Cl2
b. S + Cl2 SCl2
c. K + AgCl Ag + KCl
d. Ca(OH)2 + 2 HCl 2 H2O + CaCl2
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29. Use the experiment shown in the figure to answer the questions
a. A gas was given off, collected in a test tube, and then tested with a burning splint. A “pop/chirp” was heard. What was the gas?
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29. Use the experiment shown in the figure to answer the questions
a. A gas was given off, collected in a test tube, and then tested with a burning splint. A “pop/chirp” was heard. What was the gas?
hydrogen
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29. Use the experiment shown in the figure to answer the questions
b. The substances Mg metal and dilute HNO3, are called --?
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29. Use the experiment shown in the figure to answer the questions
b. The substances Mg metal and dilute HNO3, are called --?
reactants
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29. Use the experiment shown in the figure to answer the questions
c. Write the correct balanced equation for the experiment
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29. Use the experiment shown in the figure to answer the questions
c. Write the correct balanced equation for the experiment
Mg + 2HNO3 H2 + Mg(NO3)2