Physical + Chemical Properties & changes

Question 1

physical properties include:

Answer 1

Hardness, state, malleability, ductility, melting/boiling point, crystal form, solubility, viscosity, density

Question 2

What is a chemical property?

Answer 2

They describe substances by seeing how they react with other things. They tell us whether something is flammable or if it reacts with an acid or water.

Question 3

Chemical properties include:

Answer 3

Combustibility, reaction with acid, reaction with water.

Question 4

What is a physical change?

Answer 4

In a physical change the substance involved may change state, but not become a new substance (most physical changes are easy to reverse)

Question 5

Physical change clues:

Answer 5

Melting, boiling, freezing, condensation, and sublimation.

Question 6

What is a chemical change?

Answer 6

In a chemical change, the original substance is changed into one or more different substances that have different properties.

Question 7

Chemical change clues:

Answer 7

A new colour appears, heat or light is given off, a solid material (called a precipitate) forms in a liquid, bubbles of gas are formed, the change is difficult to reverse.

Question 8

What are physical properties?

Answer 8

Physical characteristics that are used to describe a substance or an object (we use our sense to describe them)