Unit 1: Chemistry of Life Test Review

Science is an organized way of ____ and ____ evidence about the natural world.

• inference, hypothesis

• gathering, analyzing

• observing, measuring

• detecting, theorizing

A prediction or statement that can be tested is a(n)

• conclusion

• observation

• control

• hypothesis

A factor in an experiment that can change is a(n)

• variable

• observation

• control

• hypothesis

Which skill are you using when you use your five senses to gather information?

• posing questions

• observing

• developing hypotheses

• designing experiments

Which characteristic must be true of a good hypothesis?

• It must be correct.

• It must have been observed many times.

• It must involve quantitative data.

• It must be testable by observation or experiment.

A possible explanation for a set of observations is known as a(n)

• variable

• hypothesis

• theory

• conclusion

According to the scientific method, what is the next step after formulating and objectively testing hypotheses?

• interpreting results

• stating conclusions

• conducting experiments

• making observations and collecting data

A scientist hypothesizes that the type of exercise affects heart rate. The independent variable is

• type of exercise

• heart rate

A scientist hypothesizes that the type of exercise affects heart rate. The dependent variable is

• type of exercise

• heart rate

Chemical reactions change substances into different substances by

• conserving matter between the substances

• breaking and forming chemical bonds

• strengthening electrical charges of substances

• changing a solvent into a solute