Understanding Water Behavior and Molecules

In Lesson 1.1, students explore the behavior of water and food coloring to understand particle motion and attraction. They conduct experiments with water drops on wax paper and observe food coloring dispersal in water. The lesson introduces molecular models to explain these phenomena, emphasizing that particles are in constant motion and attracted to each other. Students also engage in activities to draw and model these concepts, aligning with NGSS performance expectations.

What is the primary goal of observing water behavior on wax paper and adding food coloring to water?

• To understand the color of water

• To learn about the temperature of water

• To observe the behavior of tiny particles in matter

• To see how fast water evaporates

Why is it difficult to separate a large water drop into smaller ones on wax paper?

• Because water is sticky

• Because water molecules are attracted to each other

• Because the water is too cold

• Because wax paper is slippery

What happens to the food coloring when added to room temperature water?

• It sinks to the bottom

• It stays at the top

• It spreads throughout the water

• It evaporates quickly

What concept helps explain the spreading of food coloring in water?

• Water is a solid at room temperature

• Food coloring is heavier than water

• Water molecules are in constant motion

• Water molecules are stationary

How do students represent water molecules in their drawings?

• As stars

• As squares

• As triangles

• As little spheres

What is the purpose of using motion lines in student drawings?

• To depict the temperature of molecules

• To represent that molecules are in motion

• To indicate the color of molecules

• To show the size of molecules

What does the lesson lay the foundation for in future chapters?

• Understanding the color of substances

• Predicting and describing changes in particle motion and state

• Learning about the history of water

• Studying the taste of different liquids

Which scientific practice is emphasized in Lesson 1.1?

• Developing a model to predict or describe phenomena

• Measuring the weight of water

• Calculating the speed of light

• Drawing pictures of animals

What is the cause of the water drop staying together on wax paper?

• Water molecules are frozen

• Water molecules are too large

• Water molecules are repelled by each other

• Water molecules are attracted to each other

What is the effect of water molecules being in motion?

• They stay in one place

• They cause food coloring to spread

• They become solid

• They change color