Tell whether each statement are negatively correlated, positively correlated or zero/no correlation and explain why. 1. In May of last year, the number of classes Marty missed rose from 35 to 50. When grades were reported in June, Marty's grades had dropped from A's and B's to D's and F's.

2. Elizabeth increased her practice time for the mile run from five days a week to seven days a week. After
practicing, her time improved.

3. A scientist wanted to conduct a study that showed the relationship between a person's performance on a facial recognition test and a person's height. He had a
hard time conducting this experiment and showing a
relationship.

4.Dillon studied very hard for his marine bio exam. His grades went up.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.