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Questions and Answers
In an experiment, what is the primary purpose of controlling variables?
In an experiment, what is the primary purpose of controlling variables?
- To increase the impact of the independent variable on the dependent variable.
- To ensure the dependent variable is solely affected by the independent variable. (correct)
- To complicate the experiment and make it more realistic.
- To minimize the cost and time required to conduct the experiment.
The independent variable is the variable that changes in response to the changes in the dependent variable.
The independent variable is the variable that changes in response to the changes in the dependent variable.
False (B)
In the experiment described in Photo A, what is the dependent variable?
In the experiment described in Photo A, what is the dependent variable?
The time it takes for all the fuel to burn
A factor that can change and have different values in an experiment is called a ______.
A factor that can change and have different values in an experiment is called a ______.
In the MMT production example, what was the independent variable?
In the MMT production example, what was the independent variable?
In the MMT production example, a rise of temperature was a controlled variable.
In the MMT production example, a rise of temperature was a controlled variable.
Referring to photo A, give one example of a control variable in the experiment where the burn time of a fuel is being measured.
Referring to photo A, give one example of a control variable in the experiment where the burn time of a fuel is being measured.
Match the following terms with their descriptions:
Match the following terms with their descriptions:
In the described experiment, what is the independent variable?
In the described experiment, what is the independent variable?
What is the dependent variable in the experiment?
What is the dependent variable in the experiment?
State the question that the experiment is designed to answer, based on the identified independent and dependent variables.
State the question that the experiment is designed to answer, based on the identified independent and dependent variables.
Which of the following variables, if not controlled, could affect how long it takes for the tea light flame to extinguish?
Which of the following variables, if not controlled, could affect how long it takes for the tea light flame to extinguish?
A 'fair test' ensures that changes in the dependent variable are solely due to variations in the independent variable.
A 'fair test' ensures that changes in the dependent variable are solely due to variations in the independent variable.
In a fair test, variables that are kept constant are known as ______ variables.
In a fair test, variables that are kept constant are known as ______ variables.
How could you reliably control the ambient temperature to ensure valid data collection?
How could you reliably control the ambient temperature to ensure valid data collection?
Match the variable type to its role in an experiment:
Match the variable type to its role in an experiment:
Flashcards
Variable
Variable
A factor that can change and have different values in an experiment.
Independent Variable
Independent Variable
The variable you change in an experiment.
Dependent Variable
Dependent Variable
The variable you measure; it changes as the independent variable changes.
Control Variables
Control Variables
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Why Conduct Fair Tests?
Why Conduct Fair Tests?
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Fuel Type (Experiment A)
Fuel Type (Experiment A)
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Air Currents (Experiment A)
Air Currents (Experiment A)
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Independent Variable (MMT)
Independent Variable (MMT)
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Fair Test
Fair Test
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Valid Data
Valid Data
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Tea light height
Tea light height
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Flame Duration
Flame Duration
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Experiment Variables
Experiment Variables
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Study Notes
- A variable can change and have different values.
- Experiments usually focus on two variables.
Independent Variable
- Values are chosen for it.
- The variable is chosen prior to the experiment.
- The variable the experimenter manipulates.
Dependent Variable
- Varies as the independent variable changes.
- The variable being measured.
- Measurement occurs during or after the experiment.
Fair Tests
- To test the effect of a single variable on another
Control Variables
- Other variables that could affect the dependent variable need to be controlled as much as possible to not impact the dependent variable
- Controlling variables can be important in industry.
- MMT (methylcyclopentadienyl manganese tricarbonyl) is a substance added to petrol to reduce pollution.
- The best way of making MMT was found by changing the amount of one reactant and measuring how much MMT was produced.
- It was important to control the temperature during the production of MMT
Fair Test Definition
- An experiment in which all the control variables are controlled
- Ensures these variables do not change
- If variables are not controlled it can affect the dependent variable.
- Gives valid data
Valid Data
- Something which is valid does what it is supposed to do
- By controlling all other variables, data from a fair test only shows the effect of the independent variable.
Planning an Experiment
- Identify the independent and dependent variables.
- Identify all other variables that could affect the dependent variable.
- Plan how to control these other variables.
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Description
Learn about independent, dependent, and control variables. Understand their roles in experiments. Explore how controlling variables ensures fair tests, exemplified by MMT production.
