Understanding Salt and Ice

The video explains how salt is used to melt ice on sidewalks by lowering the freezing point of water. Normally, water freezes at 0°C (32°F), but adding salt makes it freeze at a lower temperature. This process involves salt mixing with ice, turning it into liquid water, which is safer to walk on. The video suggests an experiment to observe this effect by comparing the melting time of salted and unsalted ice cubes.

What is the normal freezing point of water in Celsius?

• 50°C

• 100°C

• 32°C

• 0°C

How does salt affect the freezing point of water?

• It raises the freezing point

• It lowers the freezing point

• It has no effect

• It makes water boil

What happens when salt is sprinkled on ice?

• The ice evaporates

• The ice melts into liquid water

• The ice becomes harder

• The ice changes color

Why is water safer to walk on than ice?

• Water is colder

• Water is warmer

• Water is less slippery

• Water is more colorful

What simple experiment can you do to observe the effect of salt on ice?

• Boil water with salt

• Mix salt with hot water

• Pour salt on ice cubes and compare melting times

• Freeze salt water