Grade 1: Solids, Liquids, and Gases (Mini-Unit)

Lessons at a Glance


Lesson 1: Properties of Materials

Big Idea: Objects have many properties that we can observe directly and with tools.

Children work with various objects to identify and compare properties such as size, weight, shape, color, flexibility, and texture. They discuss which properties they measured with tools, and which properties they observed with only their senses. They are introduced to the idea that objects can be described in terms of their properties and also in terms of the materials they are made of.

 

Lesson 2: What Are Things Made Of?

Big Idea: Materials have properties that make them useful. Objects are made of many materials.

In this lesson children identify the different materials that make up familiar objects. They discuss the properties of different materials, and think about why people choose different materials to make things.

 

Lesson 3: Solids, Liquids, and Gases in Our World

Big Idea: We classify objects as solid, liquid, or gas based on their properties.

Children classify substances in the classroom as solid,liquid, or gas. Then they take a walk outside to look for more solids, liquids, and gases and practice classifying them.

 

Lesson 4: Comparing Liquids

Big Idea: We classify objects as solid, liquid, or gas based on their properties.

Children compare different liquids to identify properties the liquids share or don’t share. They also pour water between different containers, observing the changing shape of this liquid.

 

Lesson 5: Changing the Properties of Solids

Big Idea: We classify objects as solid, liquid, or gas based on their properties.

Children work with objects that are all classified as solids, but that differ in many ways. The children try to change one property of each object by trying to change its shape. Next, the class thinks of things they could do to the solids to change other properties. Finally, they discuss which property makes each dissimilar object a solid.

 

Lesson 6: Water Can Be Liquid, Solid, or Gas

Big Idea: Water can change from a liquid to a solid, and back to a liquid. Water “disappears” from an open cup, becoming a gas.

Children experience the changing states of water. In Session 1, they place water in resealable bags and predict how the water will change after they put it in the freezer. They also predict what will happen to the water levels of a covered cup of water and an uncovered cup of water over several days. In Session 2, they observe their frozen water changing from a solid to a liquid, and discuss other materials they know that can change between solid and liquid. Finally, in Session 3, they revisit the covered and uncovered cups of water to discover what happened.