Understanding Chemical Equations

Question 1

System and surrounding

Answer 1

Energy can be transfered from one substance to another

Question 2

What are reactants

Answer 2

Reactants are pure substance that go through chemical changes

Question 3

What are products

Answer 3

Productust are pure subtances formed by chemical changes.

the properties of the products are always different from the properties of the reactants

Question 4

Law of Conservation of Energy

Answer 4

The Law of Conservation of Energy
states that in a physical or chemical
change, energy may be converted
from one form to another, but the total
amount of energy remains constant

Question 5

Law of Conservation of Mass

Answer 5

The Law of Conservation of Mass
states that in any chemical reaction,
the mass of the products created is
always equal to the mass of the
reactants
* Matter cannot be created nor
destroyed

Question 6

a chemical change
has probably taken place.

Answer 6

-Heat is produced (exothermic) or
absorbed (endothermic)

-Gas bubbles form in a liquid

-The starting material is used up

-Grains of solid precipitate form in a liquid
and a new colour appears

-A change in odour

-A starting colour disappears