Instead, the atoms rearrange themselves to form new chemicals. This is known as a chemical change. The other kind of change in chemistry is a physical change, which is when a substance changes ...

Copper can be purified using electrolysis. Sample exam questions - chemical changes - Edexcel Understanding how to approach exam questions helps to boost exam performance. Question types will ...

Since there is a flame in this experiment, be sure that a teacher, parent, or other adult works with you. Wear goggles when doing this experiment as well as when cleaning up. Tealight candles are used ...