Chemistry

Question 1

Chemical reactions

Answer 1

Takes place when bonds between atoms break down and new bonds are formed.
Changes that can take place; temperature, colour, formation of gas or solid, odour.
Sometimes to start chemical reaction energy is required

Question 2

Product

Answer 2

New substances produced due to chemical reaction.

Question 3

Reactants

Answer 3

Original substances that create a chemical reaction.

Question 4

Antione-Laurent Lavoisier

Answer 4

His ideas led to the law of conservation of mass and the law of constant proportions.

Question 5

Law of conservation of mass

Answer 5

States that matter can be neither created nor destroyed during a chemical reation.

Question 6

Law of constant proportions

Answer 6

States a compound always contains the same relative amounts of each element.

Question 7

Endothermic reactions

Answer 7

Reactions which absorb energy

Question 8

Exothermic reactions

Answer 8

Reactions which give out energy

Question 9

Dependant variable

Answer 9

Variable that is measured

Goes on the X axis

Question 10

Independent variable

Answer 10

Variable that is changed

Goes on the Y axis

Question 11

Controlled variable

Answer 11

Variable that is kept the same