CHAPTER 20 | The First Law of Thermodynamics 🐣

The SI unit of heat and energy is the __________.

• BTU

• calorie

• watt

• joule

What is the formula to calculate heat energy required to raise the temperature of any substance?

• m = Q.c.p

• Q = ½ m. v

• Q = m.c.ΔT

• m = n.M

What does "ΔT" mean?

• A change in temperature

• A change in heat

• Time

• A change in height

For the formula:

Q= m.c.∆T

The units for specific heat are:

• kJ/g

• J/g°C

• J/K

• °C

If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

• 80,3712 J

• - 49,478 J

• 80,3712 K

• 123,645 °C

One calorie is equal to ...

• 0.001 kilocalories

• the amount of energy required to change the temperature of one gram of water by one degree Celsius.

• 4.186 Joules

What does m stand for in the equation for specific heat capacity?

• Melting point

• Miss Grand International

• Mass

• Measurement

Internal energy is the...

• sum of the random distribution of heat and potential energies of the molecules of the system

• sum of the kinetic and potential energies of the molecules of an object

• sum of the kinetic and potential energies of an object

• sum of the random distribution of kinetic and potential energies of the molecules of the system

Does everything have Specific Heat?

• Yes

• No

• Who knows?

The heat absorbed by melting a solid is known as

• latent heat of solid

• latent heat of fusion

• latent heat of liquid

• latent heat of vaporisation

• latent heat of gas