Font size
WorksheetsDensity
Total questions: 60
Worksheet time: 51mins
Latent heat is
the heat absorbed or released at a boiling process during a change of phase
the heat absorbed or released at a constant temperature during a change of phase
the heat absorbed or released at a constant temperature during a change of phase of 1 kg object
the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius
The heat absorbed by melting a solid is known as
latent heat of fusion
latent heat of solid
latent heat of liquid
latent heat of vaporisation
The amount of heat required to change the phase of a substance depends on two factors which are
surrounding temperature
temperature change
material
the mass
specific latent heat of vaporisation is
the amount of heat required to change 1 kg of the substance from the solid to liquid phase without change in temperature
the amount of heat required to change 1 kg of the substance from the liquid to gaseous phase without change in temperature
the amount of heat required to change the temperature 1 kg of the substance by 1 degree Celcius
the symbol for specific latent heat is
c
L
Q
m
The graph shows the cooling curve of a substance. At which stages the specific latent heat released?
AB and CD
BC and DE
AB and EF
BC and CD
The graph shows the temperature of 1kg samples of three materials, A, B, and C, as they are heated. Heating occurs at a constant rate.
If material A starts to melt at 60 oC. At that point, the line on the graph will __________.
continue on as before
begin to curve upward
become steeper
become horizontal
The graph shows the temperature of 1kg samples of three materials, A, B, and C, as they are heated. Heating occurs at a constant rate.
Which material has molecules with the highest average kinetic energy after 40 s of heating?
Material A
Material B
Material C
Impossible to determine from the graph
A system consists of an ice cube floating in a glass of water. The entire system is at 0 oC. Thermal energy is then added slowly to the system, causing half of the ice to melt. What can be said about the resulting temperature of the system?
Greater than 0 oC
Less than 0 oC
Equal to 0 oC
Equal to 100 oC
The heat energy required to change 1 kg of a substance from a solid to a liquid state at the same temperature is called ____
specific heat capacity
specific latent heat of vaporization
sensible heat
specific latent heat of fusion
Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?
Part I
Part II
Part III
Part IV
Which picture represents water in a SOLID state?
Check all that apply to this picture:
it is a solid
it's not taking the shape of its container
its molecules are barely moving at all
it is a liquid
the molcules are moving very fast
What is the freezing point of water in degrees Celsius?
100 degrees
0 degrees
32 degrees
2 degrees
Check the two that are the SAME temperature!
boiling point
melting point
freezing point
dew point
Is radioactive decay 'spontaneous' ?
yes
no
sometimes
In the early twentieth century the apparatus shown in the diagram was used to investigate atomic structure. When He2+ particles were fired at a thin sheet of gold, most of the particles were detected at point P. What conclusion can be drawn from the detection of He2+ particles at point P?
Gold atoms contain electrons.
Gold atoms contain protons.
Gold atoms contain neutrons.
Gold atoms are mainly empty space.
When He2+ particles were fired at a thin sheet of gold, about 1 in 8000 of the particles were detected at point Q. What conclusion can be drawn from the detection of He2+ particles at point Q?
Gold atoms have a small, positive nucleus.
Gold atoms have electrons in orbitals.
Gold consists of ions in a sea of delocalised electrons.
Gold atoms have more protons than He2+ particles.
Which of these correctly shows the numbers of sub-atomic particles in a 41K+ ion?
Number of electrons: 19, Number of protons: 19, Number of neutrons: 20
Number of electrons: 18, Number of protons: 20, Number of neutrons: 21
Number of electrons: 18, Number of protons: 19, Number of neutrons: 22
Number of electrons: 19, Number of protons: 18, Number of neutrons: 23
Which of these correctly shows the numbers of sub-atomic particles in a 21Na+ ion?
Number of electrons: 11, Number of protons: 11, Number of neutrons: 10
Number of electrons: 10, Number of protons: 12, Number of neutrons: 9
Number of electrons: 10, Number of protons: 11, Number of neutrons: 10
Number of electrons: 11, Number of protons: 10, Number of neutrons: 11
Which of these correctly shows the numbers of sub-atomic particles in a 42Ca2+ ion?
Number of electrons: 20, Number of protons: 20, Number of neutrons: 22
Number of electrons: 18, Number of protons: 21, Number of neutrons: 21
Number of electrons: 18, Number of protons: 20, Number of neutrons: 22
Number of electrons: 20, Number of protons: 19, Number of neutrons: 23
Which model of the atom is denoted as the "plum pudding" model?
A
B
C
D
E
An atom in which the number of protons is greater than the number of neutrons is:
234U
6Li
3He
2H
Which of these atoms has the smallest number of neutrons?
3H
4He
5He
4Li
Americium-241 (24195Am) is an isotope of americium. Which of the isotopes given in the table below is not an isotope of americium?
A
B
C
The graph shows how the number of americium-241 nuclei in a sample changes with time. How many years does it take for the number of americium-241 nuclei to decrease from 10,000 to 5,000?
430 years
500 years
400 years
800 years
A householder is worried about the radiation emitted by the granite worktop in his kitchen. 1 kg of granite has an activity of 1250 Bq. The kitchen worktop has a mass of 180 kg. Calculate the activity of the kitchen worktop in Bq.
225,000 Bq
6.94 Bq
0.144 Bq
25,000 Bq
A teacher used a Geiger-Muller tube and counter to measure the number of counts in 2 minutes for a radioactive rock. The counter recorded 980 counts in two minutes. The background radiation count rate was 0.25 counts per second. Calculate the count rate for the rock.
7.92 per second
8.16 per second
490 per second
489.75 per second
In an experiment, a teacher put a 2 mm thick lead sheet in front of a radioactive source. She used a detector and counter to measure the radiation passing through the lead sheet in one minute. She then put different numbers of lead sheets, each 2 mm thick, in front of the radioactive source and measured the radiation passing through in one minute. The readings taken by the teacher are plotted in the graph. How does the amount of radiation transmitted by the lead change as the total thickness of the lead is increased?
it increases
it decreases
it stays constant
An atom that loses an electron is called an _____________________and has an overall _________________________ charge.
ion ; positive
ion ; negative
isotope ; positive
ion ; neutral
Carbon-14 and carbon-12 are two of the isotopes of carbon. The nucleus of a carbon-12 atom has the same number of ________________ as the nucleus of a carbon-14 atom.
protons
neutrons
electrons
State the number of neutrons in an atom of iodine-135 (13553I)
78
82
131
53
The graph shows how the number of americium-241 nuclei in a sample changes with time. What is the half-life of americium-241?
430 years
500 years
400 years
800 years
How old is a bone if it presently contains 0.3125g of carbon-14 and it was estimated to originally contain 80g? The half-life of carbon-14 is 5730 years.
5730 years old
11460 years old
45840 years old
22920 years old
Calculate mass if an object has a volume of 72 centimetres cubed and a density of 81 grams per centimetres cubed.
5832 grams
583.2 grams
0.89 grams
1.125 grams
Calculate mass if an object has a volume of 65 centimetres cubed and a density of 33 grams per centimetres cubed.
2145 grams
214.5 grams
1.97 grams
0.5076923 grams
Calculate mass if an object has a volume of 11 centimetres cubed and a density of 35 grams per centimetres cubed.
55 grams
5.5 grams
0.02 grams
550 grams
Calculate the density of an object that has a volume of 2 centimetres cubed and a mass of 88 grams.
44 g/cm3
0.037 g/cm3
2.7 g/cm3
108 g/cm3
Calculate the density of an object that has a volume of 93 centimetres cubed and a mass of 13 grams.
0.14 g/cm3
7.15 g/cm3
0.026 g/cm3
1209 g/cm3
Calculate volume if an object has a mass of 35 grams and a density of 48 grams per centimetres cubed.
0.73 cm3
1.4 cm3
1680 cm3
7.3 cm3
A 0.01575 kg 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.
460 J/kgoC
1.654 J/kgoC
2,567,446.875 J/kgoC
What is the correct SI unit for energy? (provide the correct name and symbol)
calorie, C
temperature, C
Joule, J
Kelvin, K
What letter is used to represent specific heat capacity?
H
P
C
T
