Question

question 1
1 pts
energy can be transferred as ______ or
__________.
heat, work
volume, potential
heat, mass
mass, volume
question 2
1 pts
the amount of heat required to raise the
temperature of 25.0 g of water by 15.0°c is
________ j.
28200
4180
1570
378

Explanation:

Question 1

Energy transfer in thermodynamics occurs mainly as heat (due to temperature difference) and work (force - displacement). Volume, potential, mass are not primary energy transfer forms.

Step1: Recall the specific - heat formula

The formula for heat \(q = mc\Delta T\), where \(m\) is mass, \(c\) is specific heat capacity (\(c_{water}=4.18\space J/g^{\circ}C\)), and \(\Delta T\) is temperature change.

Step2: Substitute values

Given \(m = 25.0\space g\), \(c = 4.18\space J/g^{\circ}C\), \(\Delta T=15.0^{\circ}C\). Then \(q=(25.0\space g)\times(4.18\space J/g^{\circ}C)\times(15.0^{\circ}C)\)

Step3: Calculate

\(q = 25\times4.18\times15=1567.5\approx1570\space J\)

Answer:

heat, work

Question 2