6.1 + 6.6 energy in reactions

Question 1

What defines an Endothermic and Exothermic reaction?

Answer 1

Endothermic reactions are when energy is absorbed and temperatures decrease making the product cold.

Exothermic reactions are when energy is given off and temperatures are increased making the product hot.

Question 2

Explain photosynthesis

Answer 2

Plants use the energy from sunlight to produce food in the form of a simple sugar called glucose. This reaction is endothermic and creates the products sugar + oxygen

Question 3

Worded equation for photosynthesis reaction

Answer 3

Carbon dioxide + water → sugar + oxygen

Question 4

Explain combustion

Answer 4

Combustion is the burning of a fuel to produce heat and light. It is exothermic because it creates heat. The products that are formed from this equation are water + carbon dioxide

Question 5

Equation for complete combustion

Answer 5

Fuel + oxygen → water + carbon dioxide

Question 6

Equation for incomplete combustion

Answer 6

Fuel + not enough oxygen → carbon monoxide