Two chemicals are combined in a beaker and react. What data would provide the best evidence for determining if the reaction absorbed or released thermal energy? A The masses of the substances before and after the reaction

B The temperature inside the beaker before and after the reaction

C Whether or not light and sound were produced during the reaction

D How long it took for the reaction to take place once the chemicals combined

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

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