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 (a)   common metals are, relative to each other.

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

• Higher (more reactive)

• Lower (less reactive)

• The same

• Not enough information to confirm.