A chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change. Suggest a suitable hypothesis for the experiment. Also, list the dependent, independent, and controlled variables that can exist in such an investigation.

- Hypothesis: IF the temperature is increased, THEN the rate of the chemical reaction is also increased.

- Independent variable: Temperature

- Dependent variable: Rate of the chemical reaction

- Controlled variable: same concentration of reactants, same pressure

Explanation:

Hypothesis is a testable explanation to an observation or problem. The hypothesis, which must be subject to testing via experimentation, is usually written in an IF, THEN format to show the relationship between the cause (independent variable) and the effect (dependent variable). In this case, a hypothesis can go thus:

IF the temperature is increased, THEN the rate of the chemical reaction is also increased.

The independent variable is the variable that is changed or manipulated in the experiment. In this case, the DIFFERENT TEMPERATURE used is the independent variable.

The dependent variable is the variable that responds to changes made to the independent variable. It is the measured variable in an experiment. In this case, the RATE OF THE REACTION is the dependent variable.

The controlled variable or constants are those variables that are kept unchanged or the same throughout the experiment. In this experiment, while the effect of temperature is being tested, the SAME CONCENTRATION OF REACTANTS and SAME PRESSURE are the some of the possible controlled variables.

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