Ice On A String

Dr. Boyd demonstrates how to pick up ice with a string using salt. The video explains the materials needed, the scientific principle of salt lowering the freezing point of water, and provides a step-by-step guide to the experiment. The process involves placing a wet string on ice, adding salt, and waiting for the string to freeze to the ice. The video concludes by showing that the experiment fails without salt, highlighting its crucial role.

What is the primary effect of adding salt to water in the context of this experiment?

• It changes the color of the water.

• It makes the water evaporate faster.

• It increases the freezing point of water.

• It decreases the freezing point of water.

Which of the following is NOT a material needed for the ice and string experiment?

• A metal rod

• A piece of string

• Table salt

• Cold water

What is the first step in the experiment to pick up ice with a string?

• Freeze the water.

• Add ice to the container.

• Dip the string in water.

• Pour salt on the ice cube.

Why does the string stick to the ice cube after adding salt?

• The string absorbs the salt.

• The ice melts and refreezes around the string.

• The salt changes the color of the string.

• The salt makes the string sticky.

What happens when the experiment is conducted without salt?

• The string does not stick to the ice.

• The ice cube is picked up successfully.

• The ice cube melts completely.

• The string changes color.