Physical Science · NGSS 2-PS1-1

States of Matter

Physical Science Grade K-2 NGSS 2-PS1-1

Learning objective

Students classify everyday objects as solids, liquids, or gases and observe how heating and cooling change their state.

Specific learning objectives

Define solid, liquid, and gas.
Sort objects into the three states.
Predict what happens when matter is heated or cooled.
Explain that matter takes up space and has mass.

Big ideas in this unit

Solids hold their shape; liquids take the shape of their container; gases fill any space.
Heating can melt or boil; cooling can freeze or condense.
Matter takes up space and has mass.

Below you will find eight printable worksheets on States of Matter. Each printable opens on its own page with directions, ten student questions, and a one-click reveal teacher answer key.

All States of Matter printables

8 formats

01 Vocabulary Match
Match key terms to their definitions → 02 Fill in the Blank
Complete sentences using a word bank → 03 Short Answer
Explain concepts in one to three sentences → 04 Diagram Labeling
Label the parts of a science diagram → 05 Reading Passage
Read a short nonfiction passage and answer comprehension questions → 06 Sort and Classify
Sort cards or items into the correct category → 07 Investigation Lab
Plan and record a simple hands-on investigation → 08 Quick Quiz
Demonstrate understanding with a 10-question quiz →

How to teach States of Matter

Most teachers introduce States of Matter with a short demonstration or a picture-book read-aloud, then move into vocabulary work so students share a common language for the rest of the unit. The Vocabulary Match and Diagram Labeling printables on this page are designed for that opening day. From there, the Reading Passage and Short Answer printables give students a chance to think with their pencils — drawing, writing, and explaining what they noticed.

By the middle of the unit, students are ready for the Investigation Lab sheet. It scaffolds a hands-on activity using simple classroom materials and includes a structured place to record observations. Wrap the unit with the Quick Quiz, which mirrors the language and diagrams students have already practiced, so the assessment feels familiar rather than punishing.

Each printable is independent — pick what works for your class today rather than feeling boxed into a sequence.