Your teacher demonstrates one more way in which molecules behave when they are heated. She carefully warms a sealed plastic water bottle using a hand warmer. As the bottle of water
gets warmer, the container changes. Select the best explanation of what happens as thermal
energy increases
a. Heat takes up space and causes the bottle to expand.
b. The molecules move faster and closer together, which causes the bottle to collapse.
c. The molecules move slower and closer together, which causes the bottle to collapse.
d. The molecules move faster and farther apart, which causes the bottle to expand.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.