THERMOCHEM.

1 British thermal unit or 1 BTU is equal to how much calories?

• 252.164 calories

• 1055.06 calories

• 4.184 calories

• 122.11 calories

Which of the following is an example of endothermic reaction?

• Photosynthesis

• Combustion

• Burning

• Freezing

Which of the following situation is an exothermic reaction?

• Boiling of water in a casserole and let it evaporate

• Rain from water vapor in clouds

• Melting a butter for cooking

• Baking a wheat bread

A gas in a system has a constant pressure. The surroundings around the system lose 50 joules (J) of heat

and does 500 joules of work onto the system. What is the internal energy of the system in calories?

• 550 calories

• 131.45 calories

• 450 calories

• 121.45 calories

The following are the units used for enthalpy, which one is not?

• Joules (J)

• All answers are correct

• Calories (cal)

• British thermal unit (BTU)

It is the apparatus used to measure the heat involved in a system.

• Ohmmeter

• Barometer

• Calorimeter

• Thermometer

He is a British chemist who first introduced the difference between the latent heat and temperature in 1756

• Pierre-Simon Laplace

• William John Macquorn Rankine

• Joseph Black

• Rudolf Clausius

The first complete statement of the law was proposed by the German physicist named Rudolf Clausius

and a Scottish physicist named ___________ in 1850.

• Rudolf Clausius

• Joseph Black

• William John Macquorn Rankine

• Pierre-Simon Laplace

Which of the following chemical equation represents the exothermic reaction?

• A + B → C + heat

• A + C → B

• No correct answer

• A + B + heat → C

Which of the following chemical equation represents the endothermic reaction?

• A + C → B

• A + B → C + heat

• A + B + heat → C

• No correct answer