Scoence Test

Question 1

What is a solid? Give an example

Answer 1

-molecules are closely packed together
-don’t flow or change shape
-stay in one place unless pushed or pulled
-cannot be easily compressed

Ex: metal, plastics

Question 2

What is a liquid? Give an example

Answer 2

-molecules are free to move about
-can change their shape and flow
-can take the shape of a container
-doesn’t change volumes
-cannot be easily compressed

Ex: juice or water

Question 3

What is a gas? Give an example

Answer 3

-atoms bonded to one another
-can change their shape and volume
-can spread out in all different directions
-can cause explosions or major fire when compressed

Ex: oxygen, carbon dioxide, nitrogen

Question 4

What is Brownian motion? Give an example

Answer 4

Small particles bumping into larger particles (random movement).

Ex: when you put grains of pollen in water. The pollen grains (large particles) bump into the water particles ( small particles) which is random movement.

Question 5

What is diffusion? Give an example

Answer 5

When particles of 1 substance spread out and mix with the particles of another substance.

Ex: tea, when you put a tea bag in hot water the tea particles spread out in the water and mix with the water particles.

Question 6

What is suspension?

Answer 6

A mixture of 2 substances that separate if the mixture is not stirred regularly.

Question 7

What is a colloid?

Answer 7

When one substance disappears in another substance, and the 2 substances will not separate easily.

Question 8

What is a solution?

Answer 8

A mixture where the solid dissolves in the liquid. The mixture is then clear or transparent

Question 9

What is a solute?

Answer 9

The substance that is put into liquid in a solution

Question 10

What is a Solvent?

Answer 10

The liquid that is used in a solution

Question 11

What is an Evaporation?

Answer 11

When the liquid in a solution turns into a gas which then escapes into the air

Question 12

What is Chromatography?

Answer 12

It separates substances that are dissolved in a mixture

Question 13

What is distillation?

Answer 13

It removes most of the salts from water. This requires expensive equipment and lots of space

Question 14

What is a water treatment plant?

Answer 14

A factory that makes sure the water has low levels of chemical disinfectant when the water leaves the treatment plants plant