C8.3 The Effect Of Temperature Flashcards
Define the term ‘independent variable’
Value that is changed
The independent variable is manipulated to observe its effect on the dependent variable.
What does ‘dependent variable’ refer to?
Value that is measured
The dependent variable is what is observed and measured in an experiment as it responds to the independent variable.
Define ‘control variable’
May affect outcome of experiment so is kept constant
Control variables are factors that are kept constant to ensure a fair test.
What is meant by ‘valid’ in the context of an experiment?
When an experiment is suitable to answer the question
An experiment is considered valid if it accurately tests the hypothesis.
What is a ‘variable’?
Physical, chemical, or biological quantity
Variables are elements that can change and affect the outcome of an experiment.
Fill in the blank: A _______ is a value that is changed in an experiment.
[independent variable]
True or False: A control variable can vary during an experiment.
False
Control variables must remain constant to ensure the experiment’s validity.
What is the effect of increasing temperature on the rate of reaction according to collision theory?
Increases the frequency of collisions and makes the collisions more energetic
This results in an increased rate of reaction.
What happens to the rate of reaction when the temperature decreases?
Decreases the frequency of collisions and makes the collisions less energetic
This results in a decreased rate of reaction.
True or False: Increasing temperature decreases the rate of reaction.
False
Increasing temperature actually increases the rate of reaction.
Fill in the blank: Increasing the temperature increases the _______ of collisions.
frequency
This leads to a higher rate of reaction.
Fill in the blank: Decreasing the temperature makes the collisions _______.
less energetic
This results in a lower rate of reaction.
