physical vs chemical reactions

Question 1

Difference between chemical and physical change

Answer 1

in a chemical change is irreversible whislt physical change is reversible

Question 2

chemical reaciton

Answer 2

chemical process where 2 molecules combine to form a new substance.

Question 3

physical change

Answer 3

a process where matter changes forms

Question 4

law of conservation mass

Answer 4

chemical reaction mass is neither created nor destroyed.

Question 5

Although matter may change from one substance to another, what always remains the same

Answer 5

the number of atoms stays the same before and after the change takes place

Question 5

Since the overall mass of the

matter does not change…

Answer 5

The mass of the reactants must equal the mass

of the product

Question 6

Open system

Answer 6

exchanges matter and energy with it’s surroundings

Question 7

example of open systems

Answer 7

when burning Wood loses
gases like carbon dioxide and
water vapour to the environment.

Question 8

Closed systems

Answer 8

where no matter can enter/leave the system, only heat energy is
transferred

Question 9

Reactants

Answer 9

substances you start with before the chemical

reaction.

Question 10

products

Answer 10

the substances formed by the chemical reaction.

Question 11

Chemical equations

Answer 11

used to represent a chemical reaction.