Font size
WorksheetsChemistry #3 Heat
Total questions: 83
Worksheet time: 42mins
What is potential energy?
Energy that is stored
Energy that is used
Energy that is useless
Energy that is useable
What is kinetic energy?
Energy of storage
Energy of motion
Energy of matter
Energy of Chemicals
What is heat energy?
Decrease of particles from high temperature to low temperature (thermal energy)
Random movement of particles from low temperature to high temperature (thermal energy)
Random movement of particles from high temperature to low temperature (thermal energy)
Random movement of nuclear particles from low temperature to high temperature (thermal energy)
Which type of energy is associated with the random motion of atoms and molecules in a sample of air?
chemical energy
electrical energy
nuclear energy
thermal energy
What is the conservation of energy law?
Energy can not be created or destroyed; it can only change from one form to another
Energy can be created and destroyed; it can change from one form to another
Energy can not be visible; it can only visible from one form to another
Energy can not be used in any way
Which term is defined as the measure of the average kinetic energy of the particles in a sample?
Pressure
Temperature
Thermal energy
Chemical energy
If you had to draw an arrow between the two boxes below to show how heat flows, which direction would the arrow point?
↑ up
↓ down
← left
→ right
What is the unit is used to express an amount of thermal energy?
Pascals
Moles
Grams
Joules
Which tool is used to measure heat and energy?
Calorimeter
Thermometer
Scale
Measuring Tape
What is an exothermic reaction?
When heat is destroyed, the surrounding temperature increases and it feels extremely hot (Over 415 degrees celsius hot)
When heat is released, the surrounding temperature increases and it feels hot
When heat is absorbed, the surrounding temperature decreases and it feels cold
When heat is made up, the surrounding temperature decreased and it feels warm
What is an endothermic reaction?
When heat is destroyed, the surrounding temperature increases and it feels extremely hot (Over 415 degrees celsius hot)
When heat is released, the surrounding temperature increases and it feels hot
When heat is absorbed, the surrounding temperature decreases and it feels cold
When heat is made up, the surrounding temperature decreased and it feels warm
What is the freezing point of water?
-273 degrees celsius
32 degrees celsius
100 degrees celsius
0 degrees celsius
What is the boiling point of water?
100 degrees celsius
32 degrees celsius
-273 degrees celsius
0 degrees celsius
What is the meaning of absolute zero?
The temperature when all movement would stop (0 degrees Celsius / 273 Kelvin)
The temperature when all movement would stop (-273 degrees Celsius / 0 Kelvin)
The temperature when all movement could not stop (-273 degrees Celsius / 0 Kelvin)
The temperature when all gas particles would evaporate (273 degrees Celsius / 546 Kelvin)
How do you convert Celsius to Kelvin?
subtract 546
subtract 273
add 273
add 546
Which Kelvin temperature is equal to 200 degrees celsius?
-73 K
73 K
200. K
473 K
What Celsius temperature is equal to 418 K?
145 degrees celsius
144.85 degrees celsius
691 degrees celsius
-691 degrees celsius
What happens to the particles in the solid phase?
The particles become lightly packed and vibrate fastly in place
The particles become tightly packed and vibrate slowly in place
The particles become not packed at all and disappear
The particles become unfinished which is why nuclear atoms are created
What is a melting point
specific temperature at which a solid begins to turn into a gas
specific temperature at which a gas begins to turn into a liquid
The specific temperature at which a solid begins to turn into a liquid
The specific temperature at which a liquid begins to turn into a solid
According to this picture, what is the correct melting point for water?
Point A
-5 degrees Celsius
-10 degrees Celsius
0 degrees Celsius
What is melting?
When a solid goes form solid to liquid, there is no change in temperature, there is an increase in potential energy and particles move further apart
When a liquid goes form liquid to solid, there is a lot of change in temperature, there is an increase in kinetic energy and particles move further apart
When a gas goes form gas to liquid, there is some change in temperature, there is an increase in potential energy and kinetic energy and particles move further apart
When a solid goes form solid to liquid, there is a lot of change in temperature, there is an increase in kinetic energy and particles move further apart
Which statement correctly describes the energy of the particles of the sample during interval BC?
Potential energy decreases and average kinetic energy increases
Potential energy increases and average kinetic energy remains the same
Potential energy increases and average kinetic energy increases
Potential energy remains the same and kinetic energy increases
What is a boiling point?
Specific temperature at which a gas begins to turn into a solid
Specific temperature at which a solid begins to turn into a gas
Specific temperature at which a liquid begins to turn into a gas
Specific temperature at which a liquid begins to turn into a solid
Which line segment of the graph represents boiling?
AB
BC
CD
DE
What speed does particles move during s, l & g phases in a heating curve and what increases during this process?
Faster and kinetic energy increases
Faster and potential energy increases
Slower and kinetic energy increases
Slower and potential energy increases
Which physical changes are endothermic?
Melting and freezing
Melting and evaporating
Condensing and sublimation
Condensing and deposition
What happens in an endothermic reaction
Heat is multiplied
Heat is released
Heat is absorbed
Heat is destroyed
What is a cooling curve?
When the graph doesn't connect with he second graph
When the graph goes up (Endothermic reaction)
When the graph goes in a zig zag
The opposite of a heating curve (graph goes down)
What is the Condensing Point of this Substance?
150 degrees Celsius
200 degrees Celsius
175 degrees Celsius
0 to 2 minutes
What does Condensing point?
Gas to liquid, 50 degrees celsius added change in temp, increases in potential energy and particles move closer together
Gas to liquid, no change in temp, decrease in potential energy and particles move closer together
Liquid to gas, change in temp, decrease in kinetic energy and particles move closer together
Solid to liquid, no change in kinetic energy, decrease in potential energy and particles move farther apart
What is a freezing point?
A specific kinetic energy at which a gas begins to turn into nothing
A specific temperature at which a solid begins to turn into a gas
A specific temperature at which a liquid begins to turn into a solid
A specific temperature at which a metal begins to turn into a non-metal
Which point has the same temperature?
condensing point & freezing point
melting point & evaporating point
melting point & breaking up point
melting point & freezing point
What freezing or crystallization?
Liquid to solid; no change in temp, decrease in potential energy and particles move closer together
Solid to Liquid; no change in temp, decrease in kinetic energy and particles move farther apart
Gas to solid; fewer change in temp, increase in potential energy and particles move the same as the freezing point
Gas to solid; no change in temp, decrease in potential and particles move closer together
How do particles move during s, l & g phases in a cooling curve and what decreases during this phase?
The particles move slower as kinetic energy increases
The particles move slower as kinetic energy decreases
The particles move faster as kinetic energy decreases
The particles move faster as potential energy decreases
During which interval's is potential energy decreasing and average kinetic energy remaining constant?
AB and BC
AB and CD
DE and BC
DE and EF
What is exothermic?
Heat goes upward on the graph
Heat turns into light
Heat is absorbed
Heat is released
Which change is exothermic?
Freezing
Melting
Vaporization
Sublimation
What does the "q" equal to in the equation q = mC△T
Quantity of heat
Mass
Specific heat capacity
Change in temperature
What does the "m" equal to in the equation q = mC△T
Quantity of heat
Mass
Specific heat capacity
Change in temperature
What does the "c" equal to in the equation q = mC△T
Quantity of heat
Mass
Specific heat capacity
Change in temperature
What does the "△T" equal to in the equation q = mC△T
Quantity of heat
Mass
Specific heat capacity
Change in temperature
When do you use the equation q = mC△T
You use this formula whenever there is a change in temperature
You use this formula whenever there is a change in mass
You use this formula whenever there is a change in shape of the element
You use this formula whenever there is a change in molecule size
When do you use the equation q = mHv
You use this formula when you see the words "destroy", "kelvin" , or 100 degrees C for water
You use this formula when you see the words "vaporize", "bool" , or 100 degrees C for water
You use this formula when you see the words "unvaporize", "boil" , or 100 degrees C for water
You use this formula when you see the words "vaporize", "boil" , or 200 degrees C for CO2
When do you use the equation q = mHf
You use this formula when you see the words "celsius", "kelvin" , or 1000 degrees C for oxygen
You use this formula when you see the words "condensing", "freezing" , or 100 degrees C for water
You use this formula when you see the words "melt", "freeze", MP/FP, 0 degrees C for water
You use this formula when you see the words "boiling", "condensing" , or 200 degrees C for CO2
Which heat formula would you use to answer the question below
m/v=d
q=mC△T
q=mHv
q=mHf
Which heat formula would you use to answer the question below
q=mHv
q=mC△T
q=mVd
q=mHf
Which heat formula would you use to answer the question below
q=mHv
q=mC△T
q=mVd
q=mHf
What is the heat of vaporization of water?
100 J/g
4.18 J/g
2260 J/g
334 J/g
How much energy is required to vaporize 10.00 grams of water at it’s boiling point?
22.6 J
30 J
22.6 J
22,600
What is the heat of fusion of water?
334 J/g
4.18 J/g
2260 J/g
33.4 J/g
What is the minimum amount of heat required to completely melt 20.0 grams of ice at it’s melting point?
20.0 J
6680 J
45 200 J
83.6 J
What is the specific heat capacity for water?
334 J/g°K
2260 J/gK
4.18 J/gK
418 J/gK
Where can you find the heat of vaporization of water, the heat fusion of water and the specific heat capacity of water?
In table C
In table T
In table S
In table B
Is the same change in Kelvin the same change in Celsius?
Yes
No
Sometimes it can be
Never
What is the total amount of heat energy, in joules, absorbed by 25.0 grams of waterwhen the temperature of the water increases from 24.0°C to 36.0°C?
1251 J
1254 J
1250 J
1300 J
In the question “What is the total amount of heat energy, in joules, absorbed by 25.0 grams of waterwhen the temperature of the water increases from 24.0°C to 36.0°C?”, what is the value used for “C” specific heat capacity
36.0°C
24.0°C
4.18 J/g°C
25.0 g
How come 12.0°C was used for ∆T instead of the 24.0°C or 36.0°C?
This is because since the temperature of the water decreases from 24.0°C to 36.0°C, you’re gonna have to add from 36.0°C to 24.0°C, which gives you 60.0°C which is now going to be your ∆T
This is because since the temperature of the water increases from 24.0°C to 36.0°C, you’re gonna have to add from 36.0°C to 24.0°C, which gives you 60.0°C which is now going to be your ∆T
This is because since the temperature of the water increases from 24.0°C to 36.0°C, you’re gonna have to subtract from 36.0°C to 24.0°C, which gives you 12.0°C which is now going to be your mass and specific heat capacity (m and c)
This is because since the temperature of the water increases from 24.0°C to 36.0°C, you’re gonna have to subtract from 36.0°C to 24.0°C, which gives you 12.0°C which is now going to be your ∆T
What is the total amount of heat absorbed by 100.0 grams of water when the temperature is increased from 30.0°C to 45.0°C?
6270 J
418 J
12 500 J
18 800 J
What equation do you use to solve for M?
Q=M/C∆T
M=Q/C∆T
M=QC∆T
M=C∆T
The temperature of a sample of a water changed from 10°C to 20°C when the sample absorbs 418 Joules of heat. What is the mass of the sample?
1 g
100 g
10 g
1000 g
What equation do you use to solve for C?
Q= M/∆T
C= QM∆T
Q= m∆T
C= Q/m∆T
As a 15.1-gram sample of a metal absorbs 48.75 J of heat, its temperature increases 25.0 K. What is the specific heat capacity of the metal?
0.129 J/gK
1.95 J/gK
3.23 J/gK
7.74 J/gK
What equation do you use to solve for ∆T?
T=∆
T= Q/mC
Q= mC
T= QMC
What would be the change in temperature if 5.0 g of water absorbed 209J of heat?
334°C
1°C
10°C
100°C
A 100.-gram sample of HO(C) at 22.0°C absorbs 8360 joules of heat. What will be the final temperature of the water?
18.3°C
25.7°C
20.0°C
42.0°C
According to this graph, which line segments represents an increase in average kinetic energy?
AB, CD and EF
AB, BC and DE
BC and DE
AB, DE and EF
According to this graph, what is happening to the average kinetic energy of the particles during line segment BC?
The average kinetic energy burns up
The average kinetic energy remains the same
The average kinetic energy increases
The average kinetic energy decrease
According to this graph, which line segment represents an increase in potential energy and no change in kinetic energy?
AB and CD
CD and DE
BC and DE
DE and EF
According to this graph, describe in terms of particle behavior or energy, what is happening to substance X during segment BC?
Particles are closer together and potential energy decreases
Particles are closer together and potential energy increases
Particles separate and potential energy decreases
Particles separate and potential energy increases
According to this graph, identify the process that takes place during line segment DE of the heating curve?
Boiling, evaporation or condensation
Freezing or Melting
Melting, evaporation or boiling
Freezing, condensation or evaporation
According to this graph, how does this heating curve illustrate that the heat of vaporization is greater than the heat of fusion?
DE is a gas and BC is a liquid
DE is longer than BC
DE is shorter than BC
DE is still a liquid
According to this graph, using (.) represent particles of substance X, draw at least five particles as they would appear in the substance at point F?
Very tightly packed
Tightly packed
Loosely pact
Very loosely packed
According to this graph, what is the freezing point of the compound, in degrees Celsius?
70°C
40°C
60°C
50°C
According to this graph, state what is happening to the average kinetic energy of the particles of the sample between minute 2 and minute 6.
The average kinetic energy remains the same
The average kinetic energy decreases
The average kinetic energy increases
The average kinetic energy is being turned into potential energy
According to this graph, how long does it take for this. compound to freeze?
8 minutes
4 minutes
2 minutes
6 minutes
According to this graph, what is the melting point of this substance?
80°C
60°C
50°C
100°C
According to this graph, what is the melting point converted to Kelvin?
333 K
353 K
373 K
323 K
According to this graph, which line segment represents the gas phase only?
AB
BC
EF
DE
According to this graph, how long is this substance entirely in the liquid phase?
This substance is in the liquid phase for 6 minutes
This substance is in the liquid phase for 5 minutes
This substance is in the liquid phase for 11 minutes
This substance is in the liquid phase for 10 minutes
Convert the melting point of iron metal to degrees Celsius
273°C
-223°C
1,538°C
1,811°C
The heat of fusion for a substance is 122 joules per gram. How many joules of heat are needed to melt 7.50 grams of this substance at its melting point?
130 J
16 J
40,756 J
915 J
What is the total amount of heat energy absorbed by 25.0 grams of water when the temperature of the water increase from 24.0 to 36.0?
1254 J
1251 J
300 J
90,288 J
What is the specific heat of a substance if it take 3,750 J to heat up 20 grams of the substance by 15°C?
12.5 J
12.5 J/g°C
1,125,000 J/g°C
2,813 J/g°C
