SCIENCE (CHEMICAL REACTIONS)

Question 1

Difference between exothermic and endothermic reactions using examples

Answer 1

Exothermic-
1) Respiration in living organisms (releases energy)
2) Combustion of wood (releases heat and light)

Endothermic
1) Photosynthesis (absorbs energy from sunlight)
2) Melting of ice (absorbs heat to change from solid to liquid)

Question 2

Where is the reactants on the equation?

Answer 2

Before the arrow

Question 3

Where is the products on the equation?

Answer 3

After the arrow

Question 4

Structure of a chemical equation

Answer 4

R+R—->P+P
(Catalyst on arrow sometimes)

Question 5

Example of a chemical equation

Answer 5

carbon dioxide + water —-> glucose + oxygen