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AQA Combined Chemistry Paper 2 Revision Tips PDF | GCSE Chemistry Revision in One Day

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AQA Combined Chemistry Paper 2 Revision Tips PDF | GCSE Chemistry Revision in One Day
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This document covers key topics in GCSE Chemistry, focusing on rates of reaction, reversible reactions, and dynamic equilibrium. It provides essential information for students preparing for their AQA combined chemistry paper 2, offering valuable chemistry revision techniques and insights into factors affecting chemical reactions.

18/06/2023

1090

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Reversible Reactions and Dynamic Equilibrium

This page introduces the concept of reversible reactions and dynamic equilibrium in chemistry.

Definition: A reversible reaction is one where the products can react to reform the original reactants.

Key points:

  • Reversible reactions occur in closed systems where no reactants or products can escape.
  • These reactions reach a state of dynamic equilibrium when forward and backward reactions occur at the same rate.
  • The position of equilibrium depends on temperature, pressure, and concentration.

Example: The reaction between hydrated copper sulfate and anhydrous copper sulfate is reversible.

Le Chatelier's Principle is introduced, which states that if conditions of a reversible reaction are changed, the system will try to counteract the change.

Highlight: Understanding reversible reactions and equilibrium is crucial for GCSE Chemistry past papers and exams.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Concentration and Rate of Reaction: Gas Volume Measurement

This page describes an experimental method to measure the rate of reaction by monitoring gas volume.

Procedure:

  1. Add 50cm³ of 1.0M sulfuric acid to a conical flask.
  2. Add 3cm magnesium ribbon to the flask.
  3. Seal with a bung attached to a gas syringe.
  4. Record gas volume every 10 seconds.

Highlight: This experiment demonstrates how concentration affects the rate of reaction, a key topic in GCSE Chemistry.

Example: Repeating the experiment with different acid concentrations shows how concentration influences reaction rate.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Concentration and Rate of Reaction: Disappearing Cross Practical

This page outlines another practical method to investigate the effect of concentration on reaction rate.

Procedure:

  1. Add 50cm³ of sodium thiosulfate to a conical flask placed on a printed black cross.
  2. Add 5cm³ of 1.0M hydrochloric acid.
  3. Start a stopwatch and observe the solution becoming cloudy.
  4. Stop the stopwatch when the cross is no longer visible.

Highlight: This experiment is an excellent way to visually demonstrate how concentration affects the rate of reaction in chemistry.

Vocabulary: The cloudiness is caused by the production of sulfur in the reaction.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Hydrocarbons and Crude Oil

This page covers hydrocarbons, their properties, and processes related to crude oil.

Key points:

  • Hydrocarbons are compounds containing only carbon and hydrogen.
  • Properties like boiling point and viscosity depend on the size and structure of hydrocarbon molecules.
  • Cracking is a process used to break down long-chain hydrocarbons into shorter, more useful molecules.

Definition: Fractional distillation is a method used to separate crude oil into fractions based on boiling points.

Example: Steam cracking and catalytic cracking are two methods used to produce shorter chain hydrocarbons and alkenes.

Highlight: Understanding hydrocarbon chemistry is essential for AQA GCSE Chemistry revision.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Testing for Gases

This page provides methods for identifying common gases in chemistry experiments.

Gas tests:

  1. Carbon dioxide: Bubbles through limewater, turning it cloudy.
  2. Hydrogen: Burns with a 'pop' sound when a lit splint is held near it.
  3. Oxygen: Relights a glowing splint.
  4. Chlorine: Bleaches damp litmus paper white.

Highlight: These gas tests are frequently featured in GCSE Chemistry past papers and practical exams.

Example: To test for carbon dioxide, bubble the gas through limewater. If it turns cloudy, carbon dioxide is present.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Determining Purity of Substances

This page discusses methods for determining the purity of substances using melting and boiling points.

Key points:

  • Pure substances have specific melting and boiling points.
  • Impurities lower the melting point and raise the boiling point of a substance.
  • Comparing observed melting/boiling points with known values can indicate purity.

Highlight: Understanding how to determine substance purity is crucial for GCSE Chemistry revision.

Example: If a sample boils over a range of temperatures rather than at a specific point, it likely contains impurities.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

Rate of Reaction and Collision Theory

This page discusses the factors affecting the rate of chemical reactions, emphasizing the importance of collision theory.

Definition: Collision theory states that for a reaction to occur, particles must collide with sufficient energy and correct orientation.

Factors influencing reaction rates include:

  1. Pressure of reacting gases
  2. Concentration of reactants
  3. Temperature
  4. Surface area of reactants
  5. Catalysts

Highlight: Increasing temperature, concentration, pressure, or surface area generally increases the rate of reaction by promoting more frequent and energetic collisions.

The rate of reaction can be measured by the slope of a graph showing the quantity of reactant used or product formed over time.

Vocabulary: Activation energy is the minimum energy required for a successful collision between reactant particles.

Example: Powdering a solid reactant increases its surface area, leading to a higher rate of reaction.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

View

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AQA Combined Chemistry Paper 2 Revision Tips PDF | GCSE Chemistry Revision in One Day

user profile picture

Manveer

@manveerssss

·

1 Follower

Follow

This document covers key topics in GCSE Chemistry, focusing on rates of reaction, reversible reactions, and dynamic equilibrium. It provides essential information for students preparing for their AQA combined chemistry paper 2, offering valuable chemistry revision techniques and insights into factors affecting chemical reactions.

18/06/2023

1090

 

10/11

 

Chemistry

17

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Reversible Reactions and Dynamic Equilibrium

This page introduces the concept of reversible reactions and dynamic equilibrium in chemistry.

Definition: A reversible reaction is one where the products can react to reform the original reactants.

Key points:

  • Reversible reactions occur in closed systems where no reactants or products can escape.
  • These reactions reach a state of dynamic equilibrium when forward and backward reactions occur at the same rate.
  • The position of equilibrium depends on temperature, pressure, and concentration.

Example: The reaction between hydrated copper sulfate and anhydrous copper sulfate is reversible.

Le Chatelier's Principle is introduced, which states that if conditions of a reversible reaction are changed, the system will try to counteract the change.

Highlight: Understanding reversible reactions and equilibrium is crucial for GCSE Chemistry past papers and exams.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Concentration and Rate of Reaction: Gas Volume Measurement

This page describes an experimental method to measure the rate of reaction by monitoring gas volume.

Procedure:

  1. Add 50cm³ of 1.0M sulfuric acid to a conical flask.
  2. Add 3cm magnesium ribbon to the flask.
  3. Seal with a bung attached to a gas syringe.
  4. Record gas volume every 10 seconds.

Highlight: This experiment demonstrates how concentration affects the rate of reaction, a key topic in GCSE Chemistry.

Example: Repeating the experiment with different acid concentrations shows how concentration influences reaction rate.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Concentration and Rate of Reaction: Disappearing Cross Practical

This page outlines another practical method to investigate the effect of concentration on reaction rate.

Procedure:

  1. Add 50cm³ of sodium thiosulfate to a conical flask placed on a printed black cross.
  2. Add 5cm³ of 1.0M hydrochloric acid.
  3. Start a stopwatch and observe the solution becoming cloudy.
  4. Stop the stopwatch when the cross is no longer visible.

Highlight: This experiment is an excellent way to visually demonstrate how concentration affects the rate of reaction in chemistry.

Vocabulary: The cloudiness is caused by the production of sulfur in the reaction.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Hydrocarbons and Crude Oil

This page covers hydrocarbons, their properties, and processes related to crude oil.

Key points:

  • Hydrocarbons are compounds containing only carbon and hydrogen.
  • Properties like boiling point and viscosity depend on the size and structure of hydrocarbon molecules.
  • Cracking is a process used to break down long-chain hydrocarbons into shorter, more useful molecules.

Definition: Fractional distillation is a method used to separate crude oil into fractions based on boiling points.

Example: Steam cracking and catalytic cracking are two methods used to produce shorter chain hydrocarbons and alkenes.

Highlight: Understanding hydrocarbon chemistry is essential for AQA GCSE Chemistry revision.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Testing for Gases

This page provides methods for identifying common gases in chemistry experiments.

Gas tests:

  1. Carbon dioxide: Bubbles through limewater, turning it cloudy.
  2. Hydrogen: Burns with a 'pop' sound when a lit splint is held near it.
  3. Oxygen: Relights a glowing splint.
  4. Chlorine: Bleaches damp litmus paper white.

Highlight: These gas tests are frequently featured in GCSE Chemistry past papers and practical exams.

Example: To test for carbon dioxide, bubble the gas through limewater. If it turns cloudy, carbon dioxide is present.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Determining Purity of Substances

This page discusses methods for determining the purity of substances using melting and boiling points.

Key points:

  • Pure substances have specific melting and boiling points.
  • Impurities lower the melting point and raise the boiling point of a substance.
  • Comparing observed melting/boiling points with known values can indicate purity.

Highlight: Understanding how to determine substance purity is crucial for GCSE Chemistry revision.

Example: If a sample boils over a range of temperatures rather than at a specific point, it likely contains impurities.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Rate of Reaction and Collision Theory

This page discusses the factors affecting the rate of chemical reactions, emphasizing the importance of collision theory.

Definition: Collision theory states that for a reaction to occur, particles must collide with sufficient energy and correct orientation.

Factors influencing reaction rates include:

  1. Pressure of reacting gases
  2. Concentration of reactants
  3. Temperature
  4. Surface area of reactants
  5. Catalysts

Highlight: Increasing temperature, concentration, pressure, or surface area generally increases the rate of reaction by promoting more frequent and energetic collisions.

The rate of reaction can be measured by the slope of a graph showing the quantity of reactant used or product formed over time.

Vocabulary: Activation energy is the minimum energy required for a successful collision between reactant particles.

Example: Powdering a solid reactant increases its surface area, leading to a higher rate of reaction.

::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean
::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean
::1 Eveq successful
↑ Collisions
pressure,
n° of particles
minenergy
required.
the more the
particles
Collide, foster
activation
energy
mean

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the #1 education app in five European countries

4.9+

Average app rating

15 M

Pupils love Knowunity

#1

In education app charts in 12 countries

950 K+

Students have uploaded notes

Still not convinced? See what other students are saying...

iOS User

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

Philip, iOS User

The app is very simple and well designed. So far I have always found everything I was looking for :D

Lena, iOS user

I love this app ❤️ I actually use it every time I study.