Give two examples each for conduction, convection, and radiation that are not already mentioned in the content or activities in this lesson. already used: light bulb, metal spoon in tea, rubbing hands together, microwave oven, heat in a classroom, campfire, heating soup, hot air balloon, pancake griddle and greenhouse.

find out whether combustion reactions are exothermic or endothermic, and explain why.

find a substance that has a specific heat that is higher than liquid water and explain what it means.

Give two examples each for conduction, convection, and radiation.

Conduction - heating a tin can with the use of a bunsen burner, a cold iron skillet placed on a stovetop which is hot
Convection - boiling of water, hot air balloon
Radiation - UV from the sun, x-rays from an x-ray equipment

Find out whether combustion reactions are exothermic or endothermic, and explain why.
Combustion reactions are exothermic reactions since they always produce or release heat. The reactants would always have more energy than the products which causes the excess heat to be released.

Find a substance that has a specific heat that is higher than liquid water and explain what it means.
The substance which has a higher heat capacity than water would be the hydrogen gas. It has a heat capacity of 13.83 kJ/kg K. Having a higher heat capacity would mean that it requires more heat energy in order to increase the temperature as compared to water.

Ithink the answer is d.