Science - States of matter

Question 1

What are the 3 states of matter

Answer 1

Solid, Liquid and Gas

Question 2

Tell me the properties of a Solid

Answer 2

keep their shape, cannot flow, difficult to compress

Question 3

Tell me the properties of a Liquid

Answer 3

keep their volume, take shape of container, difficult to compress

Question 4

Tell me the properties of a Gas

Answer 4

change shape, spread out in all directions, easy to compress

Question 5

What is diffusion

Answer 5

When gases or liquids mix without anything moving them, because particles move
around all the time

Question 6

What is expansion

Answer 6

When materials expand (take bigger volume) when heated, because the particles vibrate more violently

Question 7

What is contracting

Answer 7

When materials contract (take smaller volume) when cooled, because particles move
slower

P.S. The exception is water: water expands when frozen

Question 8

What is Density

Answer 8

Density is the mass divided by the volume
When a material contracts, its density increases
When a material expands, its density decreases

Question 9

Why do materials contract

Answer 9

Materials contract because particles move Slower

Question 10

What does diffusion cause

Answer 10

Diffusion causes fluids to mix constantly

Question 11

Are gases easy to compress

Answer 11

Gases are easy to compress

Question 12

Are Solids easy to compress

Answer 12

No (You Can’t)

Question 13

Are Liquids easy to compress

Answer 13

No (You can’t)

Question 14

How do you calculate density

Answer 14

By dividing the mass of an object with its volume

Question 15

What do we use to measure mass

Answer 15

We use an electronic balance to measure mass.

Question 16

What are particles held together by

Answer 16

Particles are held together by forces, called bonds

Question 17

Why is energy needed when solid changes to liquid

Answer 17

• When solid changes to liquid, energy is needed to break these bonds

Question 18

what type of change is melting, freezing and evaporating?

Answer 18

• Melting, freezing, condensing etc. are physical changes

Question 19

Why do solids expand when heated?

Answer 19

• Solids expand when heated – the particles vibrate more

Question 20

How much is atmospheric pressure? (In pascal)

Answer 20

100,000 pascal

Question 21

Why do we not feel the pressure of the air particles hitting our body?

Answer 21

• We do not feel the pressure, because the fluid inside our bodies exert pressure from inside.

Question 22

The higher you go, the LOWER or HIGHER the pressure?

Answer 22

Lower

Question 23

The Lower you go, the LOWER or HIGHER the pressure?

Answer 23

Higher

Question 24

What are gases and liquids also known as?

Answer 24

Fluids

Question 25

How do objects float

Answer 25

• When the two forces, upthrust and weight balance, the object floats

Question 26

What is the density of water

Answer 26

• The density of water is 1g/cm3

Question 27

What are the 2 factors effecting upthrust

Answer 27

• The factors affecting upthrust are density and depth of the liquid

Question 28

Why do hot air balloons fly

Answer 28

• Hot air balloons fly because the overall density of the whole balloon is less than the air around it (balloon is very big)

Question 29

Where does convection take place

Answer 29

• Convection takes place in fluids (liquids and gases).

Question 30

Why do particles turn less dense when heated

Answer 30

• When part of a fluid is heated, the particles spread further apart and the fluid becomes less dense.

Question 31

What are other names for drag

Answer 31

• Water resistance and air resistance are called drag

Question 32

What is drag caused by

Answer 32

• Drag is caused by moving objects that are pushing particles out of the way

Question 33

What objects have higher drag and what objects dont?

Answer 33

• Smooth objects have less drag while rough objects have more drag

Question 34

What are streamlined objects shaped to have

Answer 34

• Streamlined objects are shaped to reduce drag. They have a smaller front area.

Question 35

What does a smooth object moving at a steady speed have

Answer 35

• An object moving at a steady speed, has balanced forces

Question 36

What will the force from the engine balance

Answer 36

• The force from the engine will balance drag and friction

Question 37

What causes more drag

Answer 37

• The faster the object moves, the more the drag