Year 7 Science · Unit 2 · Lesson 20

Unit 2 Synthesis

Foundation Worksheet

Name

Date

Class

Learning Goals

Recall key vocabulary from across Unit 2 — atoms, compounds, mixtures, isotopes, and chemical change.
Sort Unit 2 concepts into their correct theme groupings.
Connect ideas across the full unit to build a complete picture of matter and change.

Warm Up

Fill the gap

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

atoms compound mixture chemical isotope solute periodic neutrons element

All matter is made of tiny particles called . A substance made of only one type of atom is called an , while a substance made of two or more types of atoms chemically bonded together is a . When substances are physically combined without bonding, the result is a . All known elements are organised in the table, which groups elements by their properties. Atoms of the same element with different numbers of are called s. When sugar dissolves in water, sugar is the .

Your Turn

Sort it!

Write each concept from the pool into the correct theme box. Each concept belongs in exactly one box.

solid, liquid, gas protons & neutrons filtration new substance formed particle model atomic number evaporation gas given off homogeneous mixture groups & periods colour change distillation

Matter & States

Atoms & Periodic Table

Mixtures & Separation

Chemical Change

Show What You Know

1. Carbon-12 and Carbon-14 are both carbon atoms. Explain what makes them isotopes of each other, using the terms atomic number, mass number and neutrons.

Recall 2 marks

2. A student heats copper carbonate and observes a colour change from green to black and a gas being released. Is this a physical or chemical change? Give two pieces of evidence from the observation.

Recall 2 marks

Wrap Up

Write three key ideas from Unit 2 that you want to remember.