Chemistry GCSE: C5 Energy changes Flashcards Preview

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Flashcards in Chemistry GCSE: C5 Energy changes Deck (10)
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1

In an endothermic reaction:

1. Do the reactants or products store more energy?

2. Is energy taken from or given to the surroudings?

3. Does the tremperatre of the surroundings increase or decrease?

In an endothermic reaction:

1. The products store more energy than the reactants.

2. Energy is taken from the surroundings.

3. The temperature of the surroundings decreases: The surroundings get colder.

 

Endo (takes in), theramic (thermal energy).

2

In an exothermic reaction:

1. Do the reactants or products store more energy?

2. Is energy taken from or given to the sorroudings?

3. Does the tremperatre of the surroundings increase or decrease?

In an exothermic reaction:

1. The reactants store more energy than the products.

2. Energy is given to the surroundings.

3. The temperature of the surroundings increases: The surroundings get warmer.

 

Exo (gives out), theramic (thermal energy).

3

Give three examples of exothermic reactins

1. Combustion (burning).

2. Neutralisation reactions (acids +alkalis).

3. Oxidation reactions (e.g magnesium + oxygen ⇒ magnesium oxide

4

A sports injury pack gets cooler without going in the freezer.

What type of reaction is this?

Endothermic: Energy taken in and surrounding get cooler.

5

Hand warmers get warmer without heating them.

What type of reaction is this?

Exothermic: Energy given out, heating up the surroundings.

6

Rhys buys a self heating can of hot chocolate.

 

What type of reaction does the can use?

Exothermic: Energy given out to the surrounding, heating up the hot chocolate.

7

Describe the equipment you would use to measure the temperature change caused by an exothermic or endothermic reaction.

  • A polystyrene cup with a lid
  • In a glass beaker
  • Surrounded by cotton wool
  • With a thermometer in the cup

8

Triple:

What are the parts of a basic electrochemical cell?

Two different electrodes in contact with an electrolyte (an aqueous or molten ionic compound).

9

Triple:

How do electrochemical cells produce electricity?

Reactions between the electrodes and electrolyte set up a charge difference which makes current flow when a wire is connected to the electrodes.

10

Triple:

What piece of equipment is used to measure the voltage of a cell?

 

A voltmeter.