QUESTIONS

ANSWER BOX

1.

Name the three states of matter.

solid, liquid, gas

2.

Which state of matter has a fixed shape?

solid

3.

Which state of matter has most space between the particles?

gas

4.

Which is more dense, cold air or warm air?

cold air

5.

Smells can spread around a room because gas particles through the air.

diffuse

6.

Describe the movement of particles in a solid.

they vibrate

7.

Describe the movement of particles in a gas.

they move around very quickly

8.

What do we call it when a solid turns into a liquid?

melting

9.

What do we call it when a liquid turns into a solid?

freezing

10.

Which of these changes needs you to supply energy?

boiling, melting

boiling, freezing, melting

11.

What does 'condense' mean?

when a gas turns to liquid

12.

What is the opposite of 'condense'?

evaporate (boil)

13.

What do we call a liquid which dissolves a substance?

a solvent

14.

What is the solute in a solution of sugar?

sugar

15.

What can you say about the mass of substances before and after;

a) a chemical change? and,

a) they are the same

b) a physical change?

b) they are the same

16.

Complete this equation;

acid + base -->  +

salt + water

17.

Complete the word equation;

Sulphuric acid + copper oxide --- > +

 copper sulphate + water

18.

Which gas is given off when a metal reacts with an acid?

hydrogen

19.

What do we call a reaction that gives out energy?

exothermic

20.

What are the three main elements in fertiliser?

nitrogen, phosphorus,potassium

21.

What is the chemical formula for carbon dioxide?

C02

22.

What is another word for combustion?

burning (oxidation)

23.

Which type of change, chemical or physical, is no new substance made?

physical

24.

The test for carbon dioxide is when it turns a liquid milky. Which liquid?

lime water

25.

Which gas causes a pop when lit with a splint?

hydrogen