Effects of Temperature on Water

The video explains why water turns into ice, detailing its chemical composition and the three states of matter: solid, liquid, and gas. It discusses the freezing point of water and how substances like salt can lower it. The video also highlights the unique properties of ice, such as its lower density compared to water, allowing it to float and insulate aquatic life. Additionally, it addresses the impact of climate change on Arctic sea ice and the molecular behavior of water as it freezes.

What are the two elements that make up water?

• Hydrogen and Nitrogen

• Oxygen and Carbon

• Carbon and Nitrogen

• Hydrogen and Oxygen

What happens to water molecules when water freezes?

• They break apart

• They slow down and settle into place

• They speed up

• They evaporate

At what temperature does water freeze in Celsius?

• 0°C

• 32°C

• 100°C

• -2°C

Why does ice float on water?

• Ice is warmer

• Ice is denser than water

• Ice is lighter than water

• Ice has more volume

How does ice on lakes and ponds help aquatic life in winter?

• It freezes the water

• It evaporates the water

• It warms the water

• It insulates the water

What effect does adding salt have on the freezing point of water?

• Raises the freezing point

• Lowers the freezing point

• Has no effect

• Makes water boil

Why do cities use salt on roads during winter?

• To melt ice and snow

• To raise the freezing point

• To cool the roads

• To make roads slippery

What is the freezing point of saltwater in the ocean?

• 0°C

• -2°C

• 32°C

• 28.4°C

Why is sea ice important for Arctic wildlife?

• It provides food

• It offers a hunting ground

• It raises temperatures

• It melts quickly

What impact have warmer Arctic winters had on sea ice?

• Made sea ice thicker

• No change

• Increased sea ice

• Reduced sea ice