You place a test-tube of a room temperature reagent into a beaker of hot water. Which of the following statements are true? (Assume that there are no energy transfers between anything except the reagent and the water.)

Choose at least one answer.
a. q reagent is negative.
b. Energy is transferred from the water.
c. q water = -q reagent
d. Delta T water is positive.

3 answers

The change in temperature of the hot water is negative, it gets lower.

the sum of the heats gained is zero
q water+q reagent=0 or
q water=-q reagent

I don't know what q reagent is negative means. Does that mean that heat flows from the reagent, if so, then false.

The second choice is difficult, as it is poorly worded. If it were worded Net energy is transferred from the hot water, it would be true.

a, c

High school scholarships