Objective

By the end of this lesson, you will be able to understand the chemistry behind snow formation and identify the different stages of the water cycle.

Materials and Prep

• Water
• Ice cubes
• Freezer
• Stove or hot plate
• Large pot
• Thermometer
• Glass jar with lid
• Marker

Prior knowledge required: Basic understanding of the water cycle.

Activities

1. Activity 1: Freezing Water

   Step 1: Fill an ice cube tray with water and place it in the freezer.

   Step 2: Observe the ice cubes forming and discuss the process of freezing.

2. Activity 2: Melting Ice

   Step 1: Take one ice cube and heat it on a stove or hot plate in a pot.

   Step 2: Measure the temperature of the ice as it melts using a thermometer.

   Step 3: Record the temperature changes and discuss the concept of melting.

3. Activity 3: Water Vapor

   Step 1: Pour some water into a glass jar and tightly close the lid.

   Step 2: Place the jar in a warm spot, such as near a window or under a lamp.

   Step 3: Observe the condensation forming on the inside of the jar and discuss the formation of water vapor.

Seventh Grade Talking Points

• "Snow forms when water vapor in the air freezes into ice crystals."
• "The process of freezing involves the removal of heat energy from water, causing it to change from a liquid to a solid state."
• "Melting is the process of adding heat energy to a solid, causing it to change from a solid to a liquid state."
• "Water vapor is the gaseous form of water, and it is formed when liquid water evaporates or boils."
• "Condensation is the process of water vapor cooling down and changing back into liquid water, forming droplets or ice crystals."
• "The water cycle is the continuous movement of water on, above, and below the surface of the Earth."
• "Snow is an important part of the water cycle as it contributes to the storage of water in the form of ice."