science

Question 1

Chemical reaction

Answer 1

a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Question 2

Reactants

Answer 2

a substance that takes part in and undergoes change during a reaction.

Question 3

Products

Answer 3

a substance produced during a natural, chemical, or manufacturing process.

Question 4

Exothermic

Answer 4

(of a reaction or process) accompanied by the release of heat.

Question 5

Endothermic

Answer 5

(of a reaction or process) accompanied by or requiring the absorption of heat.

Question 6

Combustion

Answer 6

rapid chemical combination of a substance with oxygen, involving the production of heat and light.

Question 7

Corrosion

Answer 7

the process of corroding metal, stone, or other materials.

Question 8

Cellular respiration

Answer 8

process by which organisms combine oxygen with foodstuff molecules

Question 9

Closed systems

Answer 9

a principle stating that mass cannot be created or destroyed.

Question 10

Catalyst

Answer 10

a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

Question 11

Enzyme

Answer 11

a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.