Free Printable AP Chemistry Unit 4

1.

If a student were to mix two solutions, one containing AgNO3, and another containing KBr, name one possible sign that a reaction has taken place

a)

The resulting solution is highly conductive

b)

The resulting solution has changed color

c)

The resulting solution's temperature does not change

d)

The resulting solution's mass is close to the sum of the two separate solutions

2.

During a lab experiment, a student observed that the water in a beaker had all vaporized. The student has just witnessed a (a) change

3.

By just looking at the following chemical reaction, with no prior knowlege of any of the compounds' properties, what is the most obvious sign a reaction has taken place? $AgNO_{3\left(aq\right)}+KBr_{\left(aq\right)}\rightarrow AgBr_{\left(s\right)}+KNO_{3\left(aq\right)}$

a)

Temperature change

b)

Gas formation

c)

Formation of a precipitate

d)

No reaction has occurred

4.

Which of the following represents a correct net ionic equation?

a)

$NaNO_{3\left(aq\right)}+NH_4Cl_{\left(aq\right)}\rightarrow NaCl_{\left(aq\right)}+NH_4NO_{3\left(aq\right)}$

b)

$6Fe^{2+}\rightarrow6Fe^{3+}+6e^-$

c)

$HCl_{\left(aq\right)}+NaOH_{\left(aq\right)}\rightarrow NaCl_{\left(aq\right)}+H_2O_{\left(l\right)}$

d)

$Ag_{\left(aq\right)}^++Cl_{\left(aq\right)}^-\rightarrow AgCl_{\left(s\right)}$

5.

Which of the following is the net ionic equation for a reaction between lead(II) nitrate and sodium iodide?

a)

$Pb\left(NO_3\right)_{2\left(aq\right)}+2NaI_{\left(aq\right)}\rightarrow PbI_{2\left(s\right)}+2NaNO_{3\left(aq\right)}$

b)

$Pb_{\left(aq\right)}^{2+}+I_{2\left(aq\right)}^-\rightarrow PbI_{2\left(s\right)}$

c)

$Pb_{\left(aq\right)}^{2+}+2I_{\left(aq\right)}^-\rightarrow PbI_{2\left(s\right)}$

d)

$2Na_{\left(aq\right)}^++2NO_{3\left(aq\right)}^-\rightarrow2NaNO_{3\left(aq\right)}$

6.

$2Ag_{\left(aq\right)}^++CrO_{4\left(aq\right)}^{2-}\rightarrow Ag_2CrO_{4\left(s\right)}$

is an example of a(n) __________

a)

Total Ionic Equation

b)

Net Ionic Equation

c)

Molecular Equation

d)

Acid-Base Equation

7.

Which of the following represents a decomposition rection?

a)

b)

$O_2+2H_2\rightarrow2H_2O$

c)

d)

$2H_2O\rightarrow2H_2+O_2$

8.

If the red circles represent sodium, and the green represents chlorine, which of the two elements in the drawing is the limiting reactant for this reaction?
$2Na^{ }+Cl_2^{ }\rightarrow2NaCl$

a)

Sodium

b)

Chlorine

c)

Sulfur

d)

Hydrogen

9.

A beaker was half filled with pure ethanol and placed over a burner. As the temperature of the ethanol reached 78°C, bubbling could be seen in the beaker. The gaseous contents of the bubbles were analyzed. The presence of which of the following substances would show that the bubbling was due to a physical change?

a)

Carbon dioxide

b)

Chlorine

c)

Water

d)

Ethanol

10.

If samples of $BaCl_2$ and $Na_2SO_4$ are combined in solution and a precipitate forms, which of the following is evidence of ionic bonds having been formed in the precipitate?

a)

High melting point

b)

The solution does not conduct electicity

c)

Low melting point

d)

The solution is orange in color

11.

(a) forces are responsible for chemical changes in a substance

12.

$C_3H_{8\left(g\right)}+5O_{2\left(g\right)}\rightarrow3CO_{2\left(g\right)}+4H_2O_{\left(g\right)}$
According to the equation above, what amount of $C_3H_8$ would be required to produce 100g of $CO_2$ ?

a)

33.4g

b)

35.4g

c)

37.4g

d)

39.4g

13.

How much $PbBr_2$ would be produced if 230mL of 0.2M $LiBr$ was mixed with excess $Pb\left(NO_3\right)_2$ ?

a)

5.4g

b)

6.4g

c)

7.4g

d)

8.4g

14.

$2AgNO_{3\left(aq\right)}+MgCl_{2\left(aq\right)}\rightarrow2AgCl_{\left(s\right)}+Mg\left(NO_3\right)_{2\left(aq\right)}$ According to the equation above, when 200mL of 0.1M $AgNO_3$ is mixed with with 100mL of 0.2M $MgCl_2$ , a certain amount of $AgCl$ is produced. Which of the following would produce double this amount?

a)

200L 0.2M $AgNO_3$ and 100L 0.4M $MgCl_2$

b)

200L 0.1M $AgNO_3$ and 100L 0.2M $MgCl_2$

c)

400mL 0.2M $AgNO_3$ and 200mL 0.4M $MgCl_2$

d)

400mL 0.1M $AgNO_3$ and 200mL 0.2M $MgCl_2$

15.

The (a) is the substance of unknown concentration in a titration

16.

A 0.5M solution of $HCl$ is titrated with 2.0M $NaOH$ . What is the volume of $HCl$ if 10mL $NaOH$ is needed to reach the equivalence point?

a)

10mL

b)

20mL

c)

40mL

d)

80mL

17.

The substance of known concentration and volume in a titration is known as the (a)

18.

Which of the following is a redox reaction?

a)

$H_2SO_{4\left(aq\right)}+2NaOH_{\left(aq\right)}\rightarrow Na_2SO_{4\left(aq\right)}+2H_2O_{\left(l\right)}$

b)

$CH_{4\left(g\right)}+2O_{2\left(g\right)}\rightarrow CO_{2\left(g\right)}+2H_2O_{\left(g\right)}$

c)

$2AgNO_{3\left(aq\right)}+MgCl_{2\left(aq\right)}\rightarrow Mg\left(NO_3\right)_{2\left(aq\right)}+2AgCl_{\left(s\right)}$

d)

$HClO_{4\left(aq\right)}+LiOH_{\left(aq\right)}\rightarrow LiClO_{4\left(aq\right)}+H_2O_{\left(l\right)}$

19.

Which of the following is an acid-base reaction?

a)

$H_2SO_{4\left(aq\right)}+2NaOH_{\left(aq\right)}\rightarrow Na_2SO_{4\left(aq\right)}+2H_2O_{\left(l\right)}$

b)

$CH_{4\left(g\right)}+2O_{2\left(g\right)}\rightarrow CO_{2\left(g\right)}+2H_2O_{\left(g\right)}$

c)

$2AgNO_{3\left(aq\right)}+MgCl_{2\left(aq\right)}\rightarrow Mg\left(NO_3\right)_{2\left(aq\right)}+2AgCl_{\left(s\right)}$

d)

$HClO_{4\left(aq\right)}+LiOH_{\left(aq\right)}\rightarrow LiClO_{4\left(aq\right)}+H_2O_{\left(l\right)}$

20.

Which of the following is a precipitation reaction?

a)

$H_2SO_{4\left(aq\right)}+2NaOH_{\left(aq\right)}\rightarrow Na_2SO_{4\left(aq\right)}+2H_2O_{\left(l\right)}$

b)

$CH_{4\left(g\right)}+2O_{2\left(g\right)}\rightarrow CO_{2\left(g\right)}+2H_2O_{\left(g\right)}$

c)

$2AgNO_{3\left(aq\right)}+MgCl_{2\left(aq\right)}\rightarrow Mg\left(NO_3\right)_{2\left(aq\right)}+2AgCl_{\left(s\right)}$

d)

$HClO_{4\left(aq\right)}+LiOH_{\left(aq\right)}\rightarrow LiClO_{4\left(aq\right)}+H_2O_{\left(l\right)}$

21.

Which of the following is considered amphoteric?

a)

$H_2O$

b)

$H_2CO_3$

c)

$CO_3^{2-}$

d)

$HCO_3^-$

22.

Which of the following is a conjugate acid-base pair?

a)

$H_3O^+$ and $OH^-$

b)

$H_2SO_4$ and $H_2SO_3$

c)

$H_2O$ and $H_3O^+$

d)

$H_2PO_3^-$ and $PO_3^{3-}$

23.

A Brønsted Lowry acid is a proton (a)

24.

$CH_4+2O_2\rightarrow CO_2+2H_2O$
Which of the following occurs in the above reaction?

a)

Carbon is oxidized

b)

Oxygen is oxidized

c)

Carbon is reduced

d)

Oxygen is reduced

25.

$Fe_2O_3+3CO\rightarrow2Fe+3CO_2$
Which of the following is correct about the equation above?

a)

The oxidation number of Fe does not change

b)

The oxidation number of Fe changes from +2 to 0

c)

The oxidation number of Fe changes from +3 to 0

d)

This is not a redox reaction

AP Chemistry Unit 4

Total questions: 25

Worksheet time: 6hrs 15mins

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