Chemistry Quizzes


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1. Hydrogen produced in the following reaction is collected over water at 23oC and 742 Torr:

2Al + 6HCl –> 2AlCl3 + 3H2

What volume (mL) of the gas will be collected in the reaction of 1.50 g Al with excess HCl?

2. Sample of O2 gas has a volume of 50.0 L at a pressure of 750. mmHg. What is the final volume, in liters, of the gas at 2.0 atm?

3. What is the mass, in grams, of 475 mL of nitrogen gas at STP?

4. A 25.0 mL bubble is released from a diver’s air tank at a pressure of 4.00 atm and a pressure of 11oC. What is the volume, in mL, of the bubble when it reaches the ocean surface, where the pressure is 1.00 atm and the temperature is 18oC?

5. You vaporize a liquid substance at 100 oC and 755 mmHg. The volume of 0.548 g of vapor is 237 mL. What is the molecular mass of the substance?

6. Given the following chemical equation:

4NH3 + 5O2 –> 4NO + 6H2O

What volume (mL) of oxygen at 35 oC and 2.15 atm is needed to produce 100.0 g of NO?


Chapter 7-Quiz

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1. Calculate the wavelength (in nm) of a light with a frequency of 4.62 x 1014 Hz.

2. An electron in a hydrogen atom makes a transition from n = 6 to n = 5.

a. Calculate the wavelength.

b. Was energy released or absorbed? Explain.

3. Determine the energy (in J) of a light with a wavelength of 245 nm.