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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Decomposition

Double replacement

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Decomposition

Double replacement

Synthesis

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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


H2O H2 + O2

AgCl + Cu CuCl + Ag

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CH4 + O2 CO2 + 2 H2O combustion


H2O H2 + O2

AgCl + Cu CuCl + Ag

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AgNO3 + NaCl NaNO3 + AgCl double replacement

H2O H2 + O2

AgCl + Cu CuCl + Ag

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H2O H2 + O2 decomposition

AgCl + Cu CuCl + Ag single replacement

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H2O H2 + O2


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H2O H2 + O2 decomposition


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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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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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b. The substances Mg metal and dilute HNO3, are called --?

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b. The substances Mg metal and dilute HNO3, are called --?

reactants

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c. Write the correct balanced equation for the experiment

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c. Write the correct balanced equation for the experiment

Mg + 2HNO3 H2 + Mg(NO3)2

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