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WorksheetsBenchmark Q3 Exam Review
Total questions: 40
Worksheet time: 7hrs 40mins
What is energy?
ability to increase temperature
ability to do work or produce motion
being hot or cold
something with lots of molecules
What are the 5 different types of energy? (select all that apply)
mechanical
chemical
electrical
light
thermal
What is the equation for potential energy?
P=1/2mv2
F=ma
P=mgh
TME=P + E
What does the variable "m" mean?
gravity (m/s2)
height (m)
velocity (m/s)
mass (kg)
What does the variable "g" mean?
gravity (m/s2)
height (m)
velocity (m/s)
mass (kg)
What does the variable "h" mean?
gravity (m/s2)
height (m)
velocity (m/s)
mass (kg)
What does the variable "P" mean?
Potential Energy (J)
height (m)
velocity (m/s)
mass (kg)
What is the equation for kinetic energy?
K=1/2mv2
F=ma
P=mgh
TME=P + E
What does the variable "v" mean?
Potential Energy (J)
height (m)
velocity (m/s)
mass (kg)
What does the variable "K" mean?
Potential Energy (J)
height (m)
velocity (m/s)
Kinetic Energy (J)
What is the kinetic energy of a 10 kg object moving at 3 m/s?
10 J
15 J
45 J
30 J
Conservation of energy says that energy cannot be created or destroyed, only __________________.
transferred
made new
removed
erased
Total mechanical energy is ___________________ energy + __________________ energy.
heat; kinetic
gravitational; potential
potential; kinetic
heat; thermal
Does the total mechanical energy (TME) of an object ever change?
No! It is only transferred from potential to kinetic and back to potential
Yes! When an object increases in height, the TME also increases.
Yes! When an object moves faster, the TME also increases.
At the top of a hill, a person on a bike has 500 J of potential energy, and 0 J of kinetic energy. What is the Total Mechanical Energy (TME) at the top of the hill?
0 J
250 J
100 J
500 J
At the top of a hill, a person on a bike has 500 J of potential energy, and 0 J of kinetic energy. What is the Potential Energy at the middle of the hill if the kinetic energy is 250 J?
0 J
250 J
100 J
500 J
At the top of a hill, a person on a bike has 500 J of potential energy, and 0 J of kinetic energy. What is the Kinetic Energy at the bottom of the hill if the potential energy is 0 J?
0 J
250 J
100 J
500 J
How is heat (thermal energy) related to kinetic energy of molecules?
heat = total kinetic energy of molecules in an object
heat and molecules are the same thing
heat is not related to kinetic energy of molecules at all
What are the units of thermal energy? Hint: it’s not “degrees”...heat is a form of energy.
degrees
meters
kilograms
Joules
The faster the molecules move, the _______________ the temperature.
higher
lower
Total thermal energy can be found by adding all the ______________ energies of all the molecules of a substance.
Potential
Kinetic
A cold lake has more total thermal energy than a pot of hot water. How is this possible?
a pot of hot water has more molecules in it than a cold lake
a cold lake has less molecules in it than a pot of hot water
a cold lake has more molecules in it than a pot of hot water
If you add heat energy to an object, the increase in temperature depends on what two factors? (select 2)
potential energy
mass
material
gravity
Touching hot metal burns you worse than touching plastic that is the same temperature. Why does the metal burn you worse than the plastic?
metal is naturally hotter than plastic
metal is a better conductor of heat energy than plastic
plastic is a better conductor of heat energy than metal
A teapot heating up on a stove is gaining heat via:
radiation
conduction
convection
Warming your hands by a campfire is an example of:
radiation
conduction
convection
Movement of hot rock in Earth's mantle from high heat areas to lower heat areas is an example of:
radiation
conduction
convection
What are the 3 particles inside an atom? (select 3)
proton
nucleus
neutron
electron
Protons are
negatively charged and orbiting around the nucleus
positively charged and orbiting around the nucleus
positively charged and inside the nucleus
negatively charged and inside the nucleus
Electrons are
negatively charged and orbiting around the nucleus
positively charged and orbiting around the nucleus
positively charged and inside the nucleus
negatively charged and inside the nucleus
Neutrons are
negatively charged and orbiting around the nucleus
positively charged and orbiting around the nucleus
neutrally charged and inside the nucleus
negatively charged and inside the nucleus
The atomic number (whole number in the corner of the chemical symbol) tells you the total number of _____________ in an atom.
neutrons
protons
electrons and neutrons
protons and neutrons
The number of electrons must be _________________ the number of protons (in a neutral atom).
equal to
less than
more than
You can find the number of neutrons by subtracting: mass number (ave. atomic mass) minus _______________
protons
electrons and neutrons
neutrons
Find the chemical symbol for Krypton (Kr). How many protons, neutrons, and electrons does Krypton have?
84, 84, 36
36, 36, 36
36, 48, 84
36, 48, 36
How many electrons can fit in the first, second, and third rings around the nucleus?
8, 8, 8
2, 8, 8
2, 2, 2
2, 10, 18
Which image is a model of the element Nitrogen (N) with protons, neutrons and electrons drawn in their correct places?
How many valence (outer shell) electrons does Nitrogen have?
1
3
5
7
When looking at the periodic table, what increases as you move down the rows?
number of valence electrons
number of orbits/shells/electron rings
When looking at the periodic table, what increases as you move across the columns?
number of valence electrons
number of orbits/shells/electron rings
