Unit 7 Instant Ice Quiz

What was the main purpose of the experiment?

• To test different water types

• To measure temperature changes

• To make instant ice

• To observe ice melting

What is the freezing point of water?

• 32°F

• -8°C

• 100°C

• 0°C

What materials were used in the experiment?

• Purified water, ice, and salt

• Tap water, ice, and sugar

• Glass bottles, ice, and salt

• Purified water, sand, and salt

What happens to the freezing point of ice when salt is added?

• The temperature increases

• The temperature decreases

• The temperature remains the same

• The temperature becomes unstable

How long did the successful attempt take?

• 15 minutes

• 20 minutes

• 26 minutes

• 17 minutes

What was the temperature reached during the successful attempt?

• -3°C

• -10°C

• 0°C

• -8°C

What is necessary for water to become supercooled?

• The water must be pure and undisturbed

• The water must be heated

• The water must be impure

• The water must be agitated

What was the result of the first attempt?

• Water did not freeze

• Water was half frozen

• Ice melted immediately

• Instant ice was formed

What did the teacher, Ms. Kwok, explain about the temperature needed for the experiment?

• It must be above 0°C

• It must be at least -8°C

• It must be exactly 0°C

• It must be below -10°C

What was observed during the second attempt?

• Ice was floating

• Water did not freeze

• Water was boiling

• Water crystallized instantly