Chem checkpoint 7 review 24-25

Which of the following describes the particles in an ideal gas? (Select TWO correct answers.)

• The particles do not have attractive forces on each other.

• The particles have attractive forces on each other.

• The particles move in a random motion.

• The particles move in an orderly pattern.

• The particles decrease the energy of the system when they collide.

Which graph in the picture shows how pressure and volume are related to each other?

• Graph A

• Graph B

• Graph C

• Graph D

The pressure of a sample of dry air is 2.25 atm, while the temperature remains constant. The original volume of the sample is 43 L. Which of the following is closest to the final volume of the sample if the final pressure reached 3 atm?

• 3.0 L

• 32 L

• 57 L

• 610 L

A sealed container holds a mixture of three gases: A, B and C. The total pressure inside the container is 850 mmHg. The partial pressure of A is 200 mmHg, and the partial pressure of C is 400 mmHg. What is the partial pressure of B in the container?

• 250 mmHg

• 850 mmHg

• 100 mmHg

• 400 mmHg

Which reaction graph shows the change in energy of an EXOTHERMIC reaction?

• A

• B

• C

• D

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-4

Students added a ammonium nitrate to a flask filled with water. They noticed that a reaction occurs and the water temperature decreases quickly. Which of these statements are true about this reaction?

• This reaction is an example of an exothermic reaction.

• Before the reaction, the water has to be warmer than the compound.

• When the compound and water mixes, a decomposition reaction takes place.

• This reaction is an example of an endothermic reaction.

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-4

Which of the processes below is an example of an ENDOTHERMIC REACTION?

• burning of a candle

• reaction of a strong acid with water

• melting ice

• fireworks

Tags

NGSS.HS-PS1-4

If 305 grams of water is heated from 5.0 °C to 85.0 °C, what is the amount of energy in J that is released? (C_p= 4.18 J/g°C)

• 25,400 J

• 33,400 J

• 102,000 J

• 127,000 J

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

The specific heat of iron is 0.385 J/g °C. How much thermal energy is required to increase the temperature of a 20g sample of copper from 30°C to 60°C?

• 154 J

• 231 J

• 308 J

• 385 J

Tags

NGSS.HS-PS3-4

The graph shows the behavior a gas. Determine whether the relationship illustrated on the graph is direct or inverse.

• The relationship is direct.

• The relationship is inverse.