Density

Question 1

3 things on solids

Answer 1

• particles are very close together
• particles arrangement in regular pattern
• particles vibrate but don’t move from place to place

Question 2

3 things on liquids

Answer 2

• particles close together
• particles aren’t arranged in a regular pattern
• particles can move around eachother

Question 3

3 things on gas

Answer 3

• particles are very far apart
• particles aren’t arranged in any pattern
• particles are moving very rapidly

Question 4

What is the attraction force of gas

Answer 4

No significant attractive force

Question 5

What does the density of a material tell us

Answer 5

The mass for a given volume

Question 6

Explain the density of a solid

Answer 6

Particles are packed closely together,solids have a lot of masses for their volume

Very high density

Question 7

Explain density of liquid

Answer 7

Because particles are close together, liquids have a lot of mass for their volume

High density

Question 8

Explain the density of a gas

Answer 8

Particles are very far apart so gases only have a small mass for their volume

Low density

Question 9

Density and floatation?

Answer 9

An object will float on a fluid if it’s density is less than the liquid

Question 10

Relationship with states of matter

Answer 10

Solids have a higher density than liquids and liquid have a higher density than gases

However exceptions exist

Question 11

How do you find the density of a regular object

Answer 11

Measure its mass and volume then use the formula

Question 12

How do you find density of an irregular object

Answer 12

• by using water displacement
• place the object in water
• the volume of displaced water equals the objects volume

Question 13

Changing density (temp)

Answer 13

• the density of substances decreases as temperature increases because substance expands, increasing the volume
• the density increases when the substance is cooler , as the molecules come closer together

Question 14

Applications in buoyancy (ships)

Answer 14

Ships are made with a design that ensures their overall density is less than that of water, allowing them to float

Question 15

Applications in material science

Answer 15

Materials with low density (like foam) are used for insulation because they trap air , which reduces heat transfer