Mother

What type of reaction releases heat?

• Endothermic

• Photochemical

• Exothermic

• Catalytic

What happens to a test tube during an exothermic reaction?

• It turns cold

• It explodes

• It gets hot

• It changes coler

What is the sign of ΔH for an endothermic reaction?

• Negative

• Positive

• Zero

• Cannot be determined

What does temperature measure?

• Speed of light

• Degree of hotness or coldness

• Mass of a substance

• Number of particles

What does specific heat capacity refer to?

• Heat needed to raise 1g by 1°C

• Heat needed to boil a substance

• Heat released in combustion

• Mass of a substance

What is the correct unit for specific heat capacity?

• JK⁻¹g⁻¹

• KJmol⁻¹

• Jg⁻¹

• Kmol⁻¹

What does the quantity of heat depend on?

• Pressure and speed

• Mass and nature of the substance

• Volume and temperature

• Shape of the container

What is calorimetry?

• Measurement of speed

• Study of electricity

• Calculation of heat changes

• Measurement of pressure

According to VSEPR theory, how do valence electrons arrange themselves?

• As close as possible

• As far as possible

• Randomly

• In circular orbits

What is activation energy?

• Energy required to melt a substance

• Energy needed for reactants to react

• Energy released in reactions

• Heat stored in products