Unit 6 Heat chem
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 0C, what Is the change of the copper's temperature? A)566.7 °C B)77,571,000 Joules
A
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. A)0.46 J/gx°C B)1.654 J/gx°C C)2,567,446.875 J/gx°C
A
A(n) _____________ is a device for measuring temperature A)thermometer B)barometer C)anemometer D)psychrometer
A
If 200 grams of water is to be heated from 24.0° C to 100.0° C to make a cup of tea, what is the mass and what is the change in temperature? A)m=200g ∆t= 66 B)m=200g ∆t=124 C)m=200 ∆t=100 D)m=200g ∆t=76
D
What is the symbol for Specific Heat A)Q B)t C)m D)C
D
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?
12.82 °C
How many joules of heat are 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/gx°C? A)297 Joules B)0.003 Joules C)297 J/gx°C D)0.003 J/gx°C
A
If I heat up 2 pans of water one has 100 mL in it and one has 1000mL. Which one heats up the fastest? A)100ml B)1000ml C)They both heat up at the same speed D)They cool down.
A
The SI units J/g°C measures A)Specific heat B)mass C)temperature D)heat energy
A
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°? A) 105 J B)10.5 J C) 1.05 J
A
The specific heat of platinum is 0.133 J/g°C. How much heat(Q) is released when a 10 g piece of platinum cools from 100°C to 50°C? A)66.5 J B)665 J C)0.0266 J D)0.665 J
A
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams? A) 12.83 B)24.12 C)351
A
The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0 °C to 35.0 °C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal? A)1.17 J/g°C B)-1.17 J/g°C C)0.857 J/g°C D)-0.857 J/g°C
A
There are four cups of hot cocoa. Tall grande venti and trenta. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST thermal energy? A)large( trenta) B) small (tall) C) Venti D)All three are the same temperature so they have same thermal energy
A
Thermal energy always moves: A)From a high temperature object to a lower temperature object. B)From a lower temperature object to a higher temperature object. C)From an object with lower kinetic energy to an object with higher kinetic energy. D)From an object of higher mass to an object of lower mass
A
What is the equation to measure change in Thermal Energy? A)Q=mc∆t B)Q=mc C)Q= ∆mct D)m=QC
A
You have 20 g of water with specific heat of 4.18 J/g°C. The temperature changes from 25° C to 20° C. How much heat energy (Q) moves from the water to the surroundings? A)418 Joules B)209 J C)83 J D)4.18 J
A
A substance with a high specific heat: A)Is always extremely hot. B)Requires a lot of energy to become hot. C)Is not heavy. D)Does not requires a lot of energy to become hot.
B
Do reactants in an endothermic reaction have a higher or lower energy than the products? A)Higher B)Lower
B
How does heat flow? A)Always from cold to warm B)Always from warm to cold C)Both warm to cold & cold to warm D) It depends on the temperature
B
If I have 2 blocks of Aluminium (one of 1kg and one of 10 kg) and heat them up with 6,000 Joules of energy. Which one will have the SMALLEST change in temperature? A) 1kg B)10kg C)They both heat up to the same temperature D)It depends on the temperature of the room
B
Select the correct SI unit for Heat A)calorie B)joule C)kelvin D)celsius
B
The transfer of thermal energy between objects of different temperatures is called... A)temperature B)heat C)internal energy D)none of these
B
Water has a specific heat of 4184 J/KgºC. Wood has a specific heat of 1760 J/KgºC. What material needs more energy to raise the temperature 1ºC? A)Wood B)Water C)Both are the same
B
A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample? A) 25 g B) 30g C)20g D)50g
C
Calculate the heat absorbed by 105.0 grams of water when it is heated to cook spaghetti. The initial temperature of the water is 20.0°C, and the final temperature of the water is 99.0°C. The specific heat of water is 4.18 J/g•°C. A)8778 J B)0.0005 J C)34673 J D)43451.1 J
C
What would be the effect on the particles if more heat is supplied to the system? A) they would slow down B) they would stop moving C) they would speed up D) There would be no effect
C
In an endothermic reaction the system is releasing energy
False
In an exothermic process the surrounding looses heat. True False
False
Is it possible to reach absolute zero?
False
True or False? Temperature is a measure of the total kinetic energy in a substance.
False
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
Higher
The temperature of a glass of cold water will eventually
Match the temperature of the surrounding environment
When thermal energy is added to a substance, the substance's particles move:
More rapidly at an increased diestance from each other
symbol for Heat
Q
The amount of energy required to raise the temperature 1ºC for every kilogram is called____?
Specific Heat
T or F A slower particle has a lower energy than an identical, faster particle.
True
The specific heat is the amount of energy needed to raise the temperature one degree Celsius of 1 gram of a substance.
True
True or False? Water in containers of different sizes can have the same temperature but different amounts of heat.
True
Temperature is a measure of the...
average kinetic energy of molecules in a substance
