Year 7 Science · Unit 2 · Lesson 7

Compounds vs Elements vs Mixtures

Foundation Worksheet

Name

Date

Class

Learning Goals

Classify substances as elements, compounds or mixtures
Explain the difference between a compound and a mixture using bonding and ratio
Identify particle diagrams for each type of substance

Warm Up

Sort it!

Write each substance from the pool into the correct category box below.

O₂ NaCl air Cu H₂O soil Fe CO₂ seawater granite

Element

Compound

Mixture

Your Turn

Fill the gap

Choose the correct word from the word bank to complete each sentence. Two words will not be used.

compound element mixture bonded ratio formula atom dissolve

A substance made of only one type of atom is called an . When two or more elements are chemically together in a fixed , the result is a . For example, H₂O is always made of two hydrogen atoms for every one oxygen atom — that fixed pattern is shown by its . Air, on the other hand, is a because its parts are only physically combined and the proportions can change.

Show What You Know

1. A student says, "Water is a mixture because it contains two different elements — hydrogen and oxygen." Explain why this student is wrong.

Recall 2 marks

2. Explain how you could use a particle diagram to tell the difference between a pure element and a compound. Describe what each would look like.

Recall 2 marks

Wrap Up

In one sentence, what was the main idea of this lesson?