Thermal 1
What are the units for specific heat capacity?
J / kg °C
J / kg K
J / g °C
J / g °K
What is the unit of Heat Energy?
Joules, J
What is the unit of Heat Capacity?
J/C
What is the unit of mass?
kg
A high specific heat means...
It requires more energy to change temperature
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25 °C to 175 °C. Calculate the specific heat capacity of iron in J/gC
0.46 J/g C
How much heat is needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g °C?
297 J
A 0.3 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J / g °C, what Is the change of the copper's temperature?
566.7 °C
How many Joules of energy are required to change 10 grams of liquid water from 20 °C to 90 °C? Specific heat of liquid water is 4.18 J / g °C.
2800 J
The specific heat of aluminum is 0.21 J / g°C. How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?
105 J
20 g of water (specific heat of water is 4.18 J / g °C) undergoes a temperature change from 25° C to 20° C. How much heat energy moved from the water to the surroundings?
418 J
The specific heat(c) of copper is 0.39 J / g °C. What is the temperature change (∆T) when 100 Joules of heat is added to 20 grams of copper?
12.82 °C
What is Specific Heat?
The amount of thermal energy required to increase the temperature of 1kg of a material by 1°C.
Which of the following best explains why the sand at the beach is hotter than the water?
a) There is more sand than water at the beach.
b) Sand has a lower specific heat than water.
d) There is more water than sand at the beach.
b
When a piece of aluminum foil is taken out of the oven and cools from 100° to 50°, What is the change in temperature?
50°
Object A has a specific heat of 4.45 J/g⁰C and object B has a specific heat of 1.82 J/g⁰C. Which object will heat up faster?
Object B, it has a lower specific heat
Graphite has a specific heat of 0.709 J/g⁰C. If a 20 gram piece of graphite is cooled from 38⁰C to 18⁰C, how much energy was lost by the graphite?
283.6 J
A. Heat moves from hot to cold
B. Heat is a form of energy
C. Heat cannot be transferred
C
How much energy is needed to raise the temperature of 0.20kg of cooking oil by 50∘C, if the specific heat capacity of this oil is 1800J/(kg∘C)?
18000J
A kettle transfers all of its energy to heating 1.0kg water, which has a specific heat capacity of 4200J/(kg∘C). If the temperature of the water increases by 10∘C, how much energy was transferred?
42000J
I boil exactly 1.00kg of water in a pan and then leave it for a two of hours. If the temperature falls from 100∘C down to room temperature of 20∘C and the water has a specific heat capacity of 4200J/(kg∘C), how much energy has the water given out to the surroundings?
336000J
A 2.0kg aluminium cube, is left in the sunlight and its temperature rises from 20∘C to 60∘C. How much energy has been transferred into the cube?
Aluminium has a specific heat capacity of 900J/(kg∘C).
720000J
750g of water is put into a hot water bottle at 80∘C. Overnight, the temperature of the hot water bottle falls to 20∘C. How much energy has been transferred out of the hot water bottle?
189000J
I take a bath in 100kg of water, which has been heated from 15∘C up to 45∘C. If the specific heat capacity of water is 4200J/(kg∘C), how much energy has been transferred into the hot water for my bath?
12600000J
A 12.5 gram piece of iron (c = 0.45 J / g °C) has an initial temperature of 100° C.
When the iron loses exactly 25 J of energy, its final temperature is ____, and this is an ____ process.
95.6 °C , exothermic