Semester 2 Interim

Moles

100

Molar Mass of Ca(NO₃)₂

164.09 g/mol

200

What is the percent composition of nitrogen in 

Ca(NO₃)₂ ?

17.07%

300

Find the Empirical Formula 

(52.2% C, 13.0% H, 34.8% O)

C₂H₆O

400

How many moles of Cl₂ are present in 14.2 g of Cl₂?

0.200 moles

500

How many atoms of NaCl can be produced from 0.45 moles of NaCl?

2.71 x 10²³ atoms 

Stoichiometry

100

Students place a strip of magnesium metal into a beaker containing aqueous copper(II) sulfate, which is bright blue. After the reaction finishes, they observe:

• Some magnesium metal is still left at the bottom of the beaker.
• The blue color disappears, leaving a clear solution.
• Reddish‑brown copper metal forms on the remaining magnesium strip.

Which reactant is the limiting reactant?

Copper II Sulfate, because the solution is no longer blue (meaning the blue from the copper is used up! 

200

2 Na + Cl₂ → 2 NaCl

How many moles of NaCl are in 3.0 moles of Na?

3 moles of NaCl

300

In a lab, you obtained 9.0 g of NaCl. Before the lab, you calculated that you would get 12.0 g. What is the % yield?

[ Actual / Theoretical x 100 ]

75%

400

2 Na + Cl₂ → 2 NaCl

How many moles of Sodium Chloride are in 14.2 g of Cl₂?

0.4 moles of NaCl

500

2 Na + Cl₂ → 2 NaCl

How many grams of Sodium Chloride are in 0.45 moles of Na?

26.3 grams

Solution Formation

100

Hexane (C₆H₁₄) and water do not form a solution. Which statement explains this phenomenon?

Hexane is nonpolar, and water is polar.

200

A student wants to determine how different factors affect the rate of dissolving a solid in water.

In Trial 1, the Particle size was small and dissolved in 10 seconds.

In Trial 2, the Particle size was medium and dissolved in 20 seconds.

In Trial 3, the Particle size was Large and dissolved in 30 seconds.

What procedures can be performed on trials 2 and 3 so that the rate of dissolving is the same as that of trial 1?

Increase the temperature 

or 

Crush the Particle 

300

After reviewing Document B, which of the following compounds could the model possibly be:

A. KCl

or 

B. CH₃

A. KCl

400

After reviewing Document B,

True or False: The substance in the image could conduct electricity.

True

500

Use the information to answer the following question.

The solubility of a substance at varying temperatures is listed:

- 1.1 g solute per 100 g solution at 20°C

- 0.8 g of solute per 100 g solution at 30°C

- 0.4 g of solute per 100 g solution at 40°C

Based on the data, what state of matter is this solute?

Gas

Colligative Prop

100

When CaI₂ is dissolved in water, how many moles of particles does it put into solution?

3

200

The freezing point of a solution is ____ the freezing point of the pure solvent.

lower than

300

At the same concentration, which of the following will elevate (increase) the boiling point the most?

A. CH₃OH

B. C₆H₁₂O₆

C. KNO₃

D. SrCl₂

D. SrCl₂

400

Rank the following solutes from least to greatest effect on freezing point:

A. KI

B. CH₃OH

C. Li₃PO₄

D. CaCl₂

CH₃OH, KI, CaCl₂, Li₃PO₄

B, A, D, C

500

After reviewing Document B,

Which would have a larger effect on boiling point: the compound in the image or molecules of sugar (C₆H₁₂O₆)? 

The molecule in the image

Curves/Molarity

100

What is the molarity of a solution that contains 40 grams of NaOH in 0.50 liter of solution?

2.0 M

200

Refer to Document A:

What mass of KCl will dissolve into 100 g of H₂O at 80 °C?

50 Grams

300

Which solution is the most concentrated?

A. 1 mole of solute dissolved in 1 liter of solution

B. 2 moles of solute dissolved in 3 liters of solution

C. 4 moles of solute dissolved in 8 liters of solution

D. 6 moles of solute dissolved in 4 liters of solution

D. 6 moles of solute dissolved in 4 liters of solution

400

Refer to Document A:

What type of solution is NaNO₃ with 70 g at 30 °C?

Unsaturated

500

Refer to Document A:

A 70g solution containing NH4Cl is made at 90 °C. It is then cooled to 70 °C. How much NH4Cl will precipitate out? 

10 grams