Chemistry Gas Laws

Front

Convert 50°C to Kelvin.

Back

323

Answer explanation

To convert Celsius to Kelvin, use the formula K = C + 273.15. For 50 C, K = 50 + 273.15 = 323.15. Thus, the correct answer is 323.

Front

How to convert temperature from Kelvin to Celsius?

Back

Subtract 273

Answer explanation

To convert Kelvin to Celsius, you subtract 273 from the Kelvin temperature. This is because 0 degrees Celsius is equivalent to 273.15 Kelvin, so for practical purposes, we use 273 for conversion.

Front

What is standard temperature?

Back

0^oC

Answer explanation

Standard temperature is defined as 0°C, which is equivalent to 273.15 K. Therefore, the correct answer is 0°C, as it represents the freezing point of water.

Front

To convert temperature from Celsius to Kelvin, add ______ to the Celsius measurement.

Back

273

Answer explanation

To convert Celsius to Kelvin, you add 273. This is because 0 degrees Celsius is equivalent to 273.15 Kelvin, and for simplicity, we use 273 in calculations.

Front

Equation to calculate temperature when a gas balloon expands from 852 mL at 298 K to 945 mL.

Back

V1/T1 = V2/T2

Answer explanation

The correct equation to use is V1/T1 = V2/T2, which relates the volume and temperature of a gas at two different states, assuming pressure remains constant. This allows us to find the new temperature at 945 mL.

Front

Melissa had a 135 mL sample of argon in a balloon. She changed the pressure from 75.0 kPa to 121 kPa. What is the new volume of the balloon?

Back

83.7 mL

Answer explanation

Using Boyle's Law (P1V1 = P2V2), we can rearrange to find V2: V2 = P1V1/P2. Substituting P1 = 75.0 kPa, V1 = 135 mL, and P2 = 121 kPa gives V2 = (75.0 kPa * 135 mL) / 121 kPa = 83.7 mL.

Front

Which unit should be used to measure the pressure of a gas in a container?

Back

atm

Answer explanation

Pressure is measured in units such as atmospheres (atm). The other options (L, K, mol) measure volume, temperature, and amount of substance, respectively, and are not units of pressure.

Front

Terry and Sam are conducting an experiment with a sample of gas (5.0 mol) at 1.0 atm. They expand the gas at constant temperature from 10.0 L to 15.0 L. The final pressure is ___ atm.

Back

0.67 atm

Answer explanation

Using Boyle's Law (P1V1 = P2V2), where P1 = 1.0 atm, V1 = 10.0 L, and V2 = 15.0 L, we find P2 = (P1V1)/V2 = (1.0 atm * 10.0 L) / 15.0 L = 0.67 atm. Thus, the final pressure is 0.67 atm.

Front

Temperature in Celsius: 100°C. Convert to Kelvin (K = Celsius + 273).

Back

373K

Answer explanation

To convert Celsius to Kelvin, add 273. For 100 Celsius: 100 + 273 = 373 K. Therefore, the correct answer is 373K.

Front

What is the boiling point of chlorine expressed in degrees Celsius if it boils at 239 K?

Back

-34 degrees Celsius

Answer explanation

To convert from Kelvin to Celsius, subtract 273.15. For chlorine, 239 K - 273.15 = -34.15 °C, which rounds to -34 °C. Thus, the boiling point of chlorine in degrees Celsius is -34 degrees Celsius.