Cooling curves, solutions and solubility curves

Question 1

Gas to liquid

Answer 1

Condensation

Question 2

Solid to liquid

Answer 2

Melting

Question 3

Liquid to gas (at boiling point)

Answer 3

Boiling

Question 4

Liquid to gas (below boiling point)

Answer 4

Evaporation

Question 5

Solid to gas

Answer 5

Sublimation

Question 6

Why do liquids and gases take the shape of their container?

Answer 6

Because their particles can move more freely so can move over each other to fit into the container

Question 7

Why can’t solids and liquids be squashed easily?

Answer 7

Because they have stronger forces so is harder for them to break apart and be swished and their particles are quite close totgeht so would be harder to squash

Question 8

Why doesn’t temperature rise even when it’s being heated/ boiled?

Answer 8

Because the energy supplied by the heating is used to overcome the forces holding the liquid/ substance totgehe so the temperature doesn’t rise until it has compeltely boiled.

Question 9

Impurities ( eg: salt) in a substance will ? The melting point

Answer 9

Decrease/ lower

Question 10

Impurities in a substance will ? its boiling point

Answer 10

Increase

Question 11

Why will putting salt on icy roads melt the ice?

Answer 11

Because it lowers the melting and freezing point, so the ice is more likely to melt even in cold climates

Question 12

Why does food cook slightly when boiled in salty water compared to pure water

Answer 12

Because salt makes the boiling point higher, so the water will boil at a higher temperature making the food cook a bit quicker.

Question 13

What is evaporation?

Answer 13

When particles on the surface of a liquid have enough energy to escape

Question 14

What temp does evaporation happen at

Answer 14

Any temp as long as it’s a liquid

Question 15

What is boiling

Answer 15

When all the particles in a substance/ liquid have enough energy to escape and turn into a gas

Question 16

What temp is boiling at?

Answer 16

For water 100 degrees, but it depends on how strong the forces between the particles are

Question 17

What is boiling

Answer 17

When a liquid is heated the vapour pressure in the liquid rises to be equal to atmospheric pressure, and then the bubbles have enough vapour pressure to prevent them from collapsing into the surrounding water, the particles then rise up to the surface and expatiate/ escape