Lesson Worksheet: Planning Experiments Chemistry

In this worksheet, we will practice testing a hypothesis by designing an investigation or experiment that is reliable, reproducible, and fair.

Q1:

A student added equal masses of powdered, small, and large chips of calcium carbonate to hydrochloric acid in three different repeats of an experiment. CO2 gas was collected and measured after 30 seconds.

What was the independent variable?

  • AThe temperature of the acid
  • BThe concentration of the acid
  • CThe volume of the CO2 gas produced
  • DThe surface area of the calcium carbonate
  • EThe mass of the CaCO3 used

What was the dependent variable?

  • AThe concentration of the acid
  • BThe surface area of the calcium carbonate
  • CThe mass of the CaCO3 used
  • DThe volume of the CO2 gas produced
  • EThe time when the measurement was taken

Which of the following is not a control variable?

  • AThe surface area of the calcium carbonate
  • BThe time when the measurement was taken
  • CThe concentration of the acid
  • DThe mass of the CaCO3 used
  • EThe temperature of the acid

Q2:

What is the variable that is measured in an experiment after the independent variable is altered?

  • AIndependent variable
  • BContinuous variable
  • CControl variable
  • DDependent variable
  • EDiscrete variable

Q3:

A primary-school science experiment shows that people with big hands generally have big feet. What kind of relationship between the two variables is this an example of?

  • AAn observation
  • BA causation
  • CAn anomaly
  • DA prediction
  • EA correlation

Q4:

What is the variable that is changed by scientists in an experiment called?

  • AIndependent
  • BControl
  • CCategorical
  • DConfounding
  • EDependent

Q5:

Which of the following is not a type of variable considered when performing scientific experiments?

  • AIndiscrete
  • BDependent
  • CControl
  • DIndependent
  • ECategorical

Q6:

Which of the following statements describes an experiment where the results are said to be reliable?

  • AAn experiment that takes multiple measurements and calculates an average
  • BAn experiment that includes control variables with only the independent variable affecting the dependent variable
  • CAn experiment that can be repeated using different equipment with similar results obtained
  • DAn experiment that highlights patterns that exist between two or more variables
  • EAn experiment that can be repeated by the same scientist and other scientists where similar results are obtained

Q7:

Which of the following statements describes an experiment where the results are said to be fair?

  • AAn experiment where multiple measurements are taken and an average is calculated
  • BAn experiment that includes control variables with only the independent variable affecting the dependent variable
  • CAn experiment that can be repeated by the same scientist and other scientists where similar results are obtained
  • DAn experiment that can be repeated using different equipment with similar results obtained
  • EAn experiment that highlights patterns that exist between two or more variables

Q8:

A scientist carries out an experiment using different apparatuses and obtains similar results. Another scientist repeats the original experiment and also obtains similar results. What is improved by these repetitions?

  • ASample size
  • BSafety
  • CFairness
  • DReliability
  • EPrecision

Q9:

Which of the following statements describes an experiment where the results are said to be reproducible?

  • AAn experiment that requires multiple measurements and calculation of an average
  • BAn experiment that can be repeated by the same scientist and by other scientists, using the same equipment, and yield similar results
  • CAn experiment that highlights patterns that exist between two or more variables
  • DAn experiment that includes control variables with only the independent variable affecting the dependent variable
  • EAn experiment that can be repeated with different equipment and yield similar results

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