What type of substance would be best for use in a heating system?

a) a solid with a high specific heat
b) a liquid with a high specific heat
c) a gas with a low specific heat
d) a liquid with a low specific heat

two hundred grams of a substance requires 1.84 kj of heat to raise its temperature from 25°c to 45°c. use the table to identify the substance. q = mcδt. mass (m) is in grams. temperature is in degrees celsius.
look at the graph

a) gold
b) iron
c) copper
d) ethanol

which of the following measures thermal energy in an object?

a) mass
b) temperature
c) volume
d) heat

1 .C) a gas with a low specific heat

2. Iron

3. Option B) temperature

Explanation:

Thinking process:

The heating system depends on the substance required to heat or cool a system. The heat capacity is the increase in the temperature of a substance of a unit mass. A unit mass is 1 kg

For heating solutions, a substance with a low specific heat capacity is needed. Thus, a substance used to heat hot water system is gas. The vapor has two energies :vaporization and enthalpy of vaporization added to it.

2. heat, is given by:

1840 = 0.2  * (45-20)  * C

       C =

          = 460 J

          = 0.460 J/gC

From the tables, the matter is iron

3. Temperature is the measurement of the average kinetic energies of a substance. This energy is then translated as heat. Hence the measure of thermal energy.