Evidence that matter is made of particles too small to see

Question 1

True or false? Particles in liquids and gases are always moving.

• A. True
• B. False

Question 2

Particles: which statement is true?

• A. Gas particles are packed tightly together.
• B. Smells reach your nose as gas particles.
• C. Particles stop moving in liquids.
• D. The smell of baking only travels if a fan blows it.

Question 3

Someone opens a bottle of perfume at the front of the class. Soon people at the back can smell it. What explains this?

• A. The bottle grew bigger.
• B. Smells travel only through walls.
• C. Tiny perfume particles spread out through the air.
• D. The smell is a kind of light.

Question 4

True or false? Particles in liquids and gases are always moving.

• A. True
• B. False

Question 5

Particles: which statement is true?

• A. You can squash air in a syringe because its particles are far apart.
• B. Gas particles are packed tightly together.
• C. Particles stop moving in liquids.
• D. The smell of baking only travels if a fan blows it.

Question 6

Sugar is stirred into water and seems to disappear, but the water tastes sweet. What does this show?

• A. The sugar sank and vanished.
• B. The water turned into sugar.
• C. The sugar broke into particles too small to see, spread through the water.
• D. The sugar was destroyed.

Question 7

True or false? You can see single particles of water with a magnifying glass.

• A. True
• B. False

Question 8

Particles: which statement is true?

• A. The smell of baking only travels if a fan blows it.
• B. Gas particles are packed tightly together.
• C. Smells reach your nose as gas particles.
• D. Particles stop moving in liquids.

Question 9

Someone opens a bottle of perfume at the front of the class. Soon people at the back can smell it. What explains this?

• A. Tiny perfume particles spread out through the air.
• B. The bottle grew bigger.
• C. The smell is a kind of light.
• D. Smells travel only through walls.

Question 10

True or false? Air is made of particles even though we cannot see them.

• A. True
• B. False

Question 11

Particles: which statement is true?

• A. A puddle dries up because water particles escape into the air.
• B. Gas particles are packed tightly together.
• C. Particles stop moving in liquids.
• D. The smell of baking only travels if a fan blows it.

Question 12

Someone opens a bottle of perfume at the front of the class. Soon people at the back can smell it. What explains this?

• A. Smells travel only through walls.
• B. Tiny perfume particles spread out through the air.
• C. The bottle grew bigger.
• D. The smell is a kind of light.

Question 13

True or false? All matter is made of particles too small to see.

• A. True
• B. False

Question 14

Particles: which statement is true?

• A. Particles stop moving in liquids.
• B. Gas particles are packed tightly together.
• C. The smell of baking only travels if a fan blows it.
• D. Smells reach your nose as gas particles.

Question 15

A drop of food colouring is put in a still glass of water. After an hour, all the water is coloured. Why?

• A. The water absorbed light.
• B. The particles of colouring and water keep moving and mixing.
• C. Someone stirred it secretly.
• D. The colouring grew.

Question 16

True or false? A balloon stays inflated because air has no mass.

• A. True
• B. False