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Reactions of Metals

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The reactivity series of metals - Reactions of metals - AQA - GCSE Chemistry (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise reactions of metals with this BBC Bitesize GCSE Chemistry (AQA) study guide.

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Acids, Alkalis & Salts

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Acidic and alkaline solutions - Acids, alkalis and salts - AQA - GCSE Chemistry (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise acids, alkalis and salts with this BBC Bitesize GCSE Chemistry (AQA) study guide.

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Titrations

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Apparatus

The apparatus needed includes:

a burette to add small, measured volumes of one reactant to the other reactant

Method

This is an outline method for carrying out a titration in which an acid is added to an alkali. The method is the same for sulfuric acid, hydrochloric acid and nitric acid.

1. Use the pipette and pipette filler to add a measured volume of sodium hydroxide solution to a clean conical flask.

2. Add a few drops of indicator and put the conical flask on a white tile.

3. Fill the burette with hydrochloric acid and note the starting volume.

4. Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.

Results

Record the results in a suitable table. The one here also shows a rough reading.

Readings should be recorded to two decimal places, ending in 0 or 5 (where the liquid level is between two graduations on the burette). The titre is the volume added (the difference between the end and start readings).

Analysis

At least two concordant titres should be ticked (✔) in the table above. These are titres within 0.20 cm 3 (or sometimes 0.10 cm 3 ) of each other.

Worked example

Calculate the mean titre from the table above. Ignore the rough run, and run 2 (because they are not concordant):

Mean titre =

= 24.65 cm 3

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Making salts from acids and alkalis - Titrations - AQA - GCSE Chemistry (Single Science) Revision - AQA - BBC Bitesize

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The apparatus needed includes: a burette to add small, measured volumes of one reactant to the other reactant This is an outline method for carrying out a titration in which an acid is added to an alkali. The method is the same for sulfuric acid, hydrochloric acid and nitric acid.

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Electrolysis

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Electrolysis of molten salts - Electrolysis - AQA - GCSE Chemistry (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise electrolysis with this BBC Bitesize GCSE Chemistry (AQA) study guide.

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Sample Exam Questions

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Chemical changes - Multiple choice questions - Sample exam questions - AQA - GCSE Chemistry (Single Science) Revision - AQA - BBC Bitesize

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Get ready for your exams with this BBC Bitesize GCSE Chemistry chemical changes (AQA) exam preparation guide.

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Reactions of Metals

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The reactivity series of metals - Reactions of metals - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

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Learn about and revise reactions of metals with this BBC Bitesize GCSE Combined Science (AQA) study guide

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Acids, Alkalis & Salts

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Acidic and alkaline solutions - Acids, alkalis and salts - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise acids, alkalis and salts with this BBC Bitesize GCSE Combined Science (AQA) study guide

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Electrolysis

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Electrolysis of molten salts - Electrolysis - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

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Learn about and revise electrolysis with this BBC Bitesize GCSE Combined Science (AQA) study guide.

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Sample Exam Questions

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Multiple choice questions appear throughout both exam papers, and at both foundation tier and higher tier. Multiple choice questions are usually asked as questions, often starting with 'what is...' or 'why...'.

You have three or four options to choose from in a multiple choice question. You must choose the number of options asked for in the question by placing ticks in boxes. Most multiple choice questions require just one tick, but a few ask for two ticks. You will not get a mark if you leave all the boxes blank, or if you put a tick in more than the required number of boxes.

Multiple choice questions often have two answers that could, at first glance, be correct. It is important to check all the answers before deciding which box to tick. It is also important to check that your chosen statement answers the question - some questions might include an option that is a correct statement, but that does not answer the question.

These questions have been written by Bitesize consultants as suggestions to the types of questions that may appear in an exam paper.

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Chemical changes - Multiple choice questions - Sample exam questions - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Multiple choice questions appear throughout both exam papers, and at both foundation tier and higher tier. Multiple choice questions are usually asked as questions, often starting with 'what is...' or 'why...'. You have three or four options to choose from in a multiple choice question.