states whatever

Question 1

Which of the 3 states of matter can be compressed?

Answer 1

gas

Question 2

why can gas be compressed?

Answer 2

Particles are far apart: they have lots of space between them

Question 3

Which of the 3 states have a fixed volume?

Answer 3

solids and liquids

Question 4

Why do substances in these states have a fixed volume?

Answer 4

Partices are held together by bonds

Question 5

Why do solids keep their shape?

Answer 5

The bonds between the particles are very strong

Question 6

Name a physical change

Answer 6

melting, freezing,

Question 7

What does the density of a substance tell you?

Answer 7

mass per unit of volume

Question 8

What are the units of these two quantities?

Answer 8

mass in kg
volume in m^3

Question 9

what’s the unit for density?

Answer 9

kg/m^3
g/cm^3

Question 10

What is the equation for calculating density?

Answer 10

mass / volume

Question 11

What usually happens to the density of a substance when it melts?

Answer 11

density decreases

Question 12

why does the density decrease?

Answer 12

The particles are closer together in a solid compared to a liquid

Question 13

What happens to the mass of a substance when it melts?

Answer 13

stay the same

Question 14

why is evaporating a physical change?

Answer 14

no new substances are made

Question 15

How is thermal energy stored in substances?

Answer 15

The kinetic energy of its particles

Question 16

What 3 factors affect the amount of thermal energy stored in a substance?

Answer 16

mass temp material

Question 17

What does specific heat capacity mean?

Answer 17

Energy required to change the temperature of 1 kg of a certain material by 1 °C

Question 18

What does specific latent heat mean?

Answer 18

Energy needed to change the state of 1 kg of a material

Question 19

What causes gas pressure?

Answer 19

The force from particles colliding with the walls of the container