KS3 Chemistry Revision

An endothermic reaction...

• Releases energy to the surrounding area.

• Boils the chemicals.

• Evaporates the chemicals.

• Takes in energy from the surrounding area.

An exothermic reaction...

• Releases energy to the surrounding area.

• Boils the reacting chemicals.

• Evaporates the reacting chemicals.

• Takes in energy from the surrounding area.

___________ reactions feel cold.

• Exothermic

• Endothermic

• Chemical

___________ reactions feel warm.

• Chemical

• Endothermic

• Exothermic

What equipment would you use to determine whether a reaction is endothermic or exothermic?

• Balance (scales)

• Ruler

• Universal Indicator

• Thermometer

A fizzy sweet, when eaten feels cold. Why?

• They are made of ice.

• It is dissolving.

• There is an endothermic reaction.

• There is an exothermic reaction.

The reactivity series describes how ________ common metals are, relative to each other.

Two reactive metals are placed inside a lemon. These are connected to a lightbulb. The lightbulb lights up, why?

• The reaction between metals in the acidic lemon transfers charge between them.

• The metals reacting causes electrons to appear.

• The metals complete the circuit.

• Acidic lemons are batteries.

Using the image. Determine why Gold, Silver and Platinum are metals used for Jewellery.

• They react with skin.

• They are valuable.

• They are unlikely to react with skin.

• They are rare and therefore profitable.

• Displacement Reaction

• Condensation Reaction

• Potato Reaction

• Reactivity Reaction