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Chemical Reactions KS3 Revision Notes and Combustion Examples for Year 8 and 9 (PDF Free)

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rosie ๐Ÿ’ซ๐Ÿงฌ

30/03/2023

Chemistry

Chemical Reactions + Combustion

Chemical Reactions KS3 Revision Notes and Combustion Examples for Year 8 and 9 (PDF Free)

Chemical Reactions: A Comprehensive Guide for Year 8 and 9 Students

This guide provides essential Chemical reactions revision notes for year 8 and 9 students, covering key concepts such as word equations, conservation of mass, balanced symbol equations, combustion, and thermal decomposition. It offers clear explanations and examples to help students understand these fundamental chemical processes.

  • Word equations and balanced symbol equations represent chemical reactions
  • Conservation of mass is a crucial principle in chemical reactions
  • Combustion is the burning of fuel in oxygen, producing water and carbon dioxide
  • Thermal decomposition involves breaking down substances using heat
...

30/03/2023

348

Chemical Reactions
H
ั
โ—
H
methane
109
carbon dioxide
โ€ขWord equations can represent a chemical reaction
The reactants are on the left side o

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Combustion and Thermal Decomposition

This page delves into two important types of chemical reactions: combustion and thermal decomposition, providing crucial Chemical reactions KS3 Worksheet content.

Combustion is the burning of a fuel in oxygen. A fuel is a substance that stores energy in a chemical form.

Definition: Combustion is a chemical reaction where a fuel burns in the presence of oxygen, releasing energy in the form of heat and light.

When a carbon-based fuel undergoes combustion, it produces water and carbon dioxide.

Example: The combustion equation for methane is: methane + oxygen โ†’ carbon dioxide + water

Hydrogen can be used as an alternative fuel, which is more environmentally friendly as it doesn't produce carbon dioxide.

Highlight: The combustion of hydrogen only produces water: hydrogen + oxygen โ†’ water

Thermal decomposition is a reaction where substances are broken down using heat.

Definition: Thermal decomposition is a chemical reaction where a compound breaks down into simpler substances when heated.

An example of thermal decomposition is the breakdown of metal carbonates:

Example: zinc carbonate โ†’ zinc oxide + carbon dioxide

This reaction can be tested by bubbling the produced gas through limewater. If the limewater turns cloudy, it confirms the presence of carbon dioxide.

Vocabulary: Limewater is a solution of calcium hydroxide used to test for the presence of carbon dioxide.

This page provides essential information for understanding combustion and chemical reactions combined science gcse topics, as well as thermal decomposition reaction examples for students.

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Chemical Reactions KS3 Revision Notes and Combustion Examples for Year 8 and 9 (PDF Free)

user profile picture

rosie ๐Ÿ’ซ๐Ÿงฌ

@nxallsc1ence

Chemical Reactions: A Comprehensive Guide for Year 8 and 9 Students

This guide provides essential Chemical reactions revision notes for year 8 and 9students, covering key concepts such as word equations, conservation of mass, balanced symbol equations, combustion, and... Show more

Chemical Reactions
H
ั
โ—
H
methane
109
carbon dioxide
โ€ขWord equations can represent a chemical reaction
The reactants are on the left side o

Sign up to see the contentIt's free!

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Join milions of students

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Combustion and Thermal Decomposition

This page delves into two important types of chemical reactions: combustion and thermal decomposition, providing crucial Chemical reactions KS3 Worksheet content.

Combustion is the burning of a fuel in oxygen. A fuel is a substance that stores energy in a chemical form.

Definition: Combustion is a chemical reaction where a fuel burns in the presence of oxygen, releasing energy in the form of heat and light.

When a carbon-based fuel undergoes combustion, it produces water and carbon dioxide.

Example: The combustion equation for methane is: methane + oxygen โ†’ carbon dioxide + water

Hydrogen can be used as an alternative fuel, which is more environmentally friendly as it doesn't produce carbon dioxide.

Highlight: The combustion of hydrogen only produces water: hydrogen + oxygen โ†’ water

Thermal decomposition is a reaction where substances are broken down using heat.

Definition: Thermal decomposition is a chemical reaction where a compound breaks down into simpler substances when heated.

An example of thermal decomposition is the breakdown of metal carbonates:

Example: zinc carbonate โ†’ zinc oxide + carbon dioxide

This reaction can be tested by bubbling the produced gas through limewater. If the limewater turns cloudy, it confirms the presence of carbon dioxide.

Vocabulary: Limewater is a solution of calcium hydroxide used to test for the presence of carbon dioxide.

This page provides essential information for understanding combustion and chemical reactions combined science gcse topics, as well as thermal decomposition reaction examples for students.

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Chemical Reactions and Conservation of Mass

This page introduces fundamental concepts in chemical reactions, focusing on word equations, conservation of mass, and balanced symbol equations.

Word equations are used to represent chemical reactions, with reactants on the left side of the arrow and products on the right. The arrow signifies the transformation of reactants into new substances.

Definition: A word equation is a way to represent a chemical reaction using the names of substances instead of chemical symbols.

Conservation of mass is a key principle in chemical reactions. It states that the total mass of reactants equals the total mass of products.

Highlight: In a reaction, the amount of each type of atom remains constant, but they are rearranged to form new products.

If it appears that mass has been lost during a reaction, it often means that a gas has been produced and escaped, accounting for the seemingly lost mass.

Balanced symbol equations provide a more detailed representation of chemical reactions. They use symbols from the Periodic Table and show:

  1. Formulae of reactants and products
  2. How atoms are rearranged
  3. Relative amounts of reactants and products

Example: The balanced equation for the formation of water is 2Hโ‚‚ + Oโ‚‚ โ†’ 2Hโ‚‚O

Vocabulary: Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

This page provides essential Chemical reactions KS3 revision material, helping students understand the basics of representing and analyzing chemical reactions.

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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

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Rohan U

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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didnโ€™t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as Iโ€™m sure you too will see developments.

Xander S

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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐Ÿ˜๐Ÿ˜๐Ÿ˜ฒ๐Ÿค‘๐Ÿ’—โœจ๐ŸŽ€๐Ÿ˜ฎ

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