pre evaluation session 2

What is thermochemistry?

• The study of pressure changes accompanied by chemical reactions

• The study of sound changes accompanied by chemical reactions

• The study of light changes accompanied by chemical reactions

• The study of heat changes accompanied by chemical reactions

What is the Law of Conservation of Energy?

• Energy can only be destroyed

• Energy can neither be created nor destroyed

• Energy can be created and destroyed

• Energy can only be created

What is an isolated system?

• It doesn't exchange either energy or matter with its surroundings

• It exchanges both energy and matter with its surroundings

• It freely exchanges matter and energy with its surroundings

• It exchanges energy but not matter with the surroundings

What is temperature?

• Measurement of the density of matter molecules

• Measurement of the volume of matter molecules

• Measurement of the pressure of matter molecules

• Measurement of the average kinetic energy of matter molecules

What is heat?

• A form of light energy

• A form of sound energy

• A form of kinetic energy

• A form of energy transferred between two bodies of different temperatures

What is the unit used to measure specific heat?

• Joule/g.C

• Kelvin

• Calorie

• Pascal

Why do farmers sprinkle water over fruit trees in very cold countries?

• To increase the specific heat of the fruits

• To decrease the specific heat of the fruits

• To protect the fruits from freezing

• To increase the temperature of the fruits

What is an exothermic reaction?

• A reaction accompanied by decrease in heat

• A reaction accompanied by evolution of heat

• A reaction accompanied by absorption of heat

• A reaction accompanied by no change in heat

What is the purpose of a calorimeter?

• To determine the change in temperature of the isolated system

• To measure the temperature of the heat exchange liquid

• To measure the heat of combustion of some substances

• To prevent any exchange of energy or matter between the system and the surroundings

What is the bomb calorimeter used for?

• To prevent any exchange of energy or matter between the system and the surroundings

• To measure the heat of combustion of some substances

• To determine the change in temperature of the isolated system

• To measure the temperature of the heat exchange liquid