Density revision

Question 1

What is density?

Answer 1

How compact or concentrated something is. How much matter something is made up of.

Question 2

What is the equation triangle for density?

Answer 2

d = m/v

Question 3

What is the equation for mass?

Answer 3

mass = density x volume

Question 4

What is the equation for volume?

Answer 4

volume = mass/density

Question 5

What are the properties of dense material particles?

Answer 5

The particles in a dense material are closer together than in a less dense material. The bonds are more secure.

Question 6

What are the properties of less dense material particles?

Answer 6

The particles in a less dense solid are further apart compared to a dense material. The bonds are not as secure as a dense material.

Question 7

What are the properties of particles in a solid?

Answer 7

They are in a regular arrangement
Vibrate in a fixed position
They are very close together

Question 8

What are the properties of particles in a liquid?

Answer 8

They are randomly arranged
They are close together
Move around each other

Question 9

What are the properties of particles in a gas?

Answer 9

They are randomly arranged
Move quickly in all directions
They are far apart (free to roam)
Not chemically bonded

Question 10

Where do particles have their energy?

Answer 10

Particles have energy in their kinetic energy stores and potential energy stores.

Question 11

What is internal energy store?

Answer 11

Internal energy store of a system is the total energy that the particles have in their kinetic and potential energy stores.

Question 12

What does heat do to particles?

Answer 12

Heat transfers energy in their kinetic energy stores, increasing the internal energy.

Question 13

Why does change of state occur?

Answer 13

Change of state occurs because the energy transferred from the heat is used to weaken and, eventually, break the bonds.

Question 14

What is it called when a solid becomes a liquid?

Answer 14

Melting

Question 15

What is it called when a liquid becomes a solid?

Answer 15

Freezing

Question 16

What is it called when a liquid becomes a gas?

Answer 16

Evaporation/boiling

Question 17

What is it called when a gas becomes a liquid?

Answer 17

Condensation

Question 18

What is it called when a solid becomes a gas?

Answer 18

Sublimation

Question 19

What is Hooke’s Law?

Answer 19

If you double the force of a spring, you double the length of a spring.

Question 20

How do you work out the density of a regular solid?

Answer 20

Weigh the solid and use the equation triangle to figure the density out. Density = mass/volume

The volume of a solid is: length x width x height

Question 21

How do you figure out the density of an irregular solid?

Answer 21

You use displacement. This is when an object is fully immersed in water and pushes the fluid out of the way to take its place.

You measure a certain amount of water and record that number. Then place the object in the water and record where the water is. Subtract the after volume and the before. This becomes the volume. The mass is then divided by the volume to give the density.

Question 22

What is the density of a cube?

Answer 22

Use the method for finding a regular solid. The volume is length x width x height.

Question 23

What is the equation for calculating weight (on any planet/moon)?

Answer 23

Weight (N) = Mass (Kg/g) x Gravitational Field Strength (N/Kg)