Basics
The amount of heat needed to raise the temperature of 1 kg of a substance by 1°C is called what?
specific heat capacity
Write the formula to calculate heat (Q)
Q = m × c × ΔT
How much heat is needed to raise 1 kg of water (c = 4200 J/kg·°C) by 1°C?
4200 J
Which needs more heat to warm up: water or metal?
water
In the formula Q = m × c × ΔT, what does “ΔT” stand for?
Change in temperature
How much heat is needed to raise 2 kg of copper (c = 385 J/kg·°C) by 10°C?
7700 J
True or False — Specific heat capacity is the same for all substances.
False
What is the units of specific heat capacity?
J/(kg·°C) and cal/(g·K)
A 0.5 kg piece of iron (c = 450 J/kg·°C) is heated from 20°C to 100°C. Find Q.
18,000 J
Why does it take longer for a big pot of soup to cool down than a small cup of soup?
Because a larger mass with higher heat capacity stores more heat energy.
If you measure heat in calories instead of joules, what would be the unit of specific heat capacity?
cal/(g·°C)
2000 J of heat raises a 0.5 kg metal block by 10°C. Find c.
400 J/kg·°C
Which would burn you more if spilled and why: hot water or hot sand at the same temperature?
Hot water (stores more heat energy).
Rearrange Q = m × c × ΔT to solve for c
Rearrange Q = m × c × ΔT to solve for c
A 1.5 kg block absorbs 12,600 J of heat. If c = 420 J/kg·°C, find ΔT.
20°C