16. calculate the amount of heat energy that is needed (7. calcula
to raise the temperature of 1000.0 g of sand from ll released
21.1 °c to 37.8 °c
temperat
q=m*c*a+
a = (1000.0 g)(0.670 j/g°c)(37.8 °c-21.1 °c)
a = 11189 j
q = 11200 j (sig figs)
18. if 11.500 t of energy is added to a 1000,0 9
19. if 11

=11189 J

Explanation:

The temperature change i caused by the enthalpy change of the sand and the consequent increase in kinetic energy.

Change in enthalpy= Mass of substance × Specific heat capacity× Temperature change.

ΔH= MC∅

M=1000.0g

C= 0.670 Jg°C

∅= 37.8°C-21.1°C=16.7°C

ΔH= 1000.0g × 0.670J/g°C × 16.7 °C

=11189 J

Therefore the heat supplied to raise the temperature from 21.1 °C to 37.8°C is 11189 J.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.