GradeGen

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

Specification 7.1, 7.2, 9.28C · Paper 1, Paper 2

A quantity deliberately changed in an investigation to see whether it affects another quantity.
Revise: Mathematical Applications
Revise: Practical: Investigating the Properties of Alloys
A condition deliberately changed to investigate its effect.
Revise: Core Practical: Rates of Reaction

3 more notes

The quantity deliberately changed in an investigation.
Revise: Methods for Determining Rate
Revise: Suggested Practicals
The variable deliberately changed during an investigation; here it is the alcohol being burned.
Revise: Core Practical: Combustion of Alcohols

Edexcel Chemistry past papers

OCR GCSE Chemistry A · J248

Specification CM5.2ii, CM6.1ii, PAG 8 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The variable deliberately changed or allowed to progress, usually time in a reaction-rate graph.
For a graph showing the progress of one reaction, put time on the x-axis because it is the independent variable. Put the measured quantity on the y-axis because it is the dependent variable.
Revise: Rate Graphs
The variable deliberately changed or represented by the values on the horizontal axis; on a reaction-progress graph, this is usually time.
Revise: Rate Graphs
The single factor deliberately changed during an investigation.
Revise: Measuring Rates of Reaction Practical

OCR Chemistry A past papers

OCR GCSE Chemistry B · J258

Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The factor deliberately changed by the investigator to test its effect.
The factor deliberately changed is the independent variable, while the outcome measured is the dependent variable. However, other factors may also affect that outcome. Relevant factors must therefore be identified and controlled.
Revise: Control of variables
The factor deliberately changed during an investigation.
Revise: Planning experiments
A factor that is deliberately changed or selected during an investigation.
Revise: Presenting data

2 more notes

The variable placed on the horizontal axis; it is usually the variable that is changed or used to organise the data.
Revise: Translating data forms
The variable deliberately changed or selected in an investigation; it is usually plotted on the horizontal axis.
Revise: Graphical display

OCR Chemistry B past papers

Exam tips

1
When comparing materials, identify the independent variable as the material or composition and name the measured property as the dependent variable.
2
Plot the independent variable on the x-axis and the dependent variable on the y-axis. Choose simple, even scales that use most of the grid.
3
Link each control variable to validity: explain that it could affect the dependent variable, so keeping it constant helps isolate the effect of the independent variable.

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

Specification 7.1, 7.2, 9.28C · Paper 1, Paper 2

A quantity deliberately changed in an investigation to see whether it affects another quantity.
Revise: Mathematical Applications
Revise: Practical: Investigating the Properties of Alloys
A condition deliberately changed to investigate its effect.
Revise: Core Practical: Rates of Reaction

3 more notes

The quantity deliberately changed in an investigation.
Revise: Methods for Determining Rate
Revise: Suggested Practicals
The variable deliberately changed during an investigation; here it is the alcohol being burned.
Revise: Core Practical: Combustion of Alcohols

Edexcel Chemistry past papers

OCR GCSE Chemistry A · J248

Specification CM5.2ii, CM6.1ii, PAG 8 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The variable deliberately changed or allowed to progress, usually time in a reaction-rate graph.
For a graph showing the progress of one reaction, put time on the x-axis because it is the independent variable. Put the measured quantity on the y-axis because it is the dependent variable.
Revise: Rate Graphs
The variable deliberately changed or represented by the values on the horizontal axis; on a reaction-progress graph, this is usually time.
Revise: Rate Graphs
The single factor deliberately changed during an investigation.
Revise: Measuring Rates of Reaction Practical

OCR Chemistry A past papers

OCR GCSE Chemistry B · J258

Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The factor deliberately changed by the investigator to test its effect.
The factor deliberately changed is the independent variable, while the outcome measured is the dependent variable. However, other factors may also affect that outcome. Relevant factors must therefore be identified and controlled.
Revise: Control of variables
The factor deliberately changed during an investigation.
Revise: Planning experiments
A factor that is deliberately changed or selected during an investigation.
Revise: Presenting data

2 more notes

The variable placed on the horizontal axis; it is usually the variable that is changed or used to organise the data.
Revise: Translating data forms
The variable deliberately changed or selected in an investigation; it is usually plotted on the horizontal axis.
Revise: Graphical display

OCR Chemistry B past papers

Exam tips

1
When comparing materials, identify the independent variable as the material or composition and name the measured property as the dependent variable.
2
Plot the independent variable on the x-axis and the dependent variable on the y-axis. Choose simple, even scales that use most of the grid.
3
Link each control variable to validity: explain that it could affect the dependent variable, so keeping it constant helps isolate the effect of the independent variable.

Independent variable

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Revise Chemistry with GradeGen

Independent variable

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Revise Chemistry with GradeGen

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Related key terms

Revise Chemistry with GradeGen

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Related key terms

Revise Chemistry with GradeGen