Match the following words with the appropriate phrase. endothermic a amount of h

Question

Match the following words with the appropriate phrase. endothermic a amount of heat need to raise 1 gram of a substance by 1 degree Celsius exothermic amount of heat needed to raise the temperature of a 1 degree C temperature energy that flows from a hotter of a colder object heat net change in heat energy is positive energy determines the direction of heat flow specific heat ability to do work heat capacity net change in heat energy is negative. In a Bomb calorimeter, an endothermic reaction would be indicated by? Increase temperature of the water Decrease temperature of the water Unchanged temperature of the water Increase in water level questions 3 thru 5 answer true (T) or false (F) All combustion reactions are classified as endothermic reactions The amount of heat needed to raise the temperature of 1 gram of water 1 degree C is the specific heat The definition of a calorie is very similar to that of heat capacity I f the molar heat of combustion of methane is 802J/mol, how many joules of would be release from the combustion of 40 grams of methane?

Explanation / Answer

a) specific heat definition

b) heat capacity definition

c) Heat energy, always flow form high T to low T

d) if dE = + then, endothermic, it absorbs energy

e) Temperature determines heat flow direction always

f) Energy is the ability to do work

g) if dHrxn is - then it is exothermic, it gives off energy

2.

if endothermic process, the reaction steals "ehat energy" from the calorimeter, therefore, expect T to decrease

3.

False, combustion is exothermic

4. True, that is specific heat

5.

false, one is energy the other is energy per unit mass and unit temperature

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