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Analyzing Data and Drawing Conclusions Answers

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The pH scale measures the acidity or the basicity of a solution. Solutions that have a pH below 7 are acids. Solutions that have a low pH are more acidic than solutions that have a higher pH. The graph below shows the pH of four common fruit juices. A student studying acidity of juices did a taste test and determined that the orange juice was the sweetest juice and the lemon and lime juices were the sourest. Based on this information, which is the best inference the student could make about acidity?

Question illustration
A
Juices with more sugar content have a lower pH.
B
Higher acidity causes juices to taste more sour.
C
Juice that tastes sour has a higher pH than juice that tastes sweet.
D
Lime juice tastes more sour than orange juice.
2
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Anjuli performed an experiment to determine the respiration rate of yeast. She determined this by measuring the amount of carbon dioxide (CO2) that was produced. Then, she created the following graph.Her teacher suggested that she redraw her graph as a line graph. Why should she redraw the graph?

Question illustration
A
A line graph looks better in a scientific report.
B
She was measuring a rate of change.
C
She had graphed the wrong relationship.
D
Her experiment had many different variables.
3

What is the best definition of a conclusion?

A
a written description of events that occurred during an experiment
B
an act of recognizing and noting an occurrence by using the senses
C
a possible explanation of a scientific question based on observation
D
an explanation that uses data to support or reject a hypothesis
4

What is the most important reason to control the conditions of an experiment?

A
to make the experiment easier to repeat
B
to reduce the amount of data that must be recorded
C
because this is necessary for graphing the data
D
because this is necessary for the data to be valid

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