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Worksheets7th Grade Fall Semester Review
Total questions: 128
Worksheet time: 1hrs 16mins
What are subatomic particles?
protons, electrons, neutrons
molecules and atoms
electrons, protons, nucleus
nucleus and electrons
What is the subatomic particle that has a positive charge?
electron
neutron
proton
megatron
What is the subatomic particle that has a negative charge?
electron
neutron
proton
megatron
What is the subatomic particle that has no charge?
electron
neutron
proton
megatron
What is the smallest particle of an ELEMENT, and it has also all the properties of it?
molecules
nucleus
subatomic particle
atoms
What is the small, DENSE REGION consisting of proton and neutrons at the CENTER of an atom?
molecules
nucleus
subatomic particle
atoms
True or False - Protons and neutrons have about the same mass.
True - They have about the same mass
False - They do not have about the same mass
Which two subatomic particles make up the nucleus of an atom?
protons and electrons
neutron and electrons
electrons and protons
protons and neutrons
Where are the ELECTRONS found in the structure of an atom?
in the nucleus
in spaces around the nucleus
How many protons does this atom have?
3
6
4
2
At what part of the atom is the arrow pointing?
nucleus
energy level
electron
proton
The mass of an atom is...
equal to the number of protons
the proton + electrons
the protons + neutrons
the protons + neutrons + electrons
In a neutral atom...
protons = electrons
protons = neutrons
neutrons = electrons
protons = neutrons = electrons
How many Hydrogen atoms are in 4 H2O (a) How many Oxygen atoms? (b)
How many O's are in Al₂(SO₄)₃
(a)
3(NH₄)₂CrO₄
Number of N (a) (a)
Number of H (b) (b)
Number of Cr (c) (c)
Number of O (d) (d)
How many elements are in 2 C6H12O7? (a) (a)
How many C (b) (b)
How many H (c) (c)
How many O (d) (d)
How many TOTAL atoms (e) (e)
2 CH2CO3OH
Number of C (a) (a)
Number of H (b) (b)
Number of O (c) (c)
How many Sulfur's are in Al₂(SO₄)₃
4
3
7
12
How many Nitrogen atoms are in the in H3C2ON5?
2
3
4
5
How many atoms of Oxygen are in Fe(NO3)3 ?
6
3
9
1
Match the element to the number of atoms it has.
2 Al(C2H3O4)2
2
aluminum
8
carbon
12
hydrogen
16
oxygen
What does the subscript in a chemical formula tell you?
How many molecules are present
How many atoms are present
How many elements are present
How many neutrons are present
What elements are represented in this chemical formula? Fe2O3
Iron, Oxygen
Francium, Europium, Oxygen
Ferrium, Oxygen
Berylium, Oxygen
How many more atoms of Oxygen than Magnesium are in this formula? (subtraction) MgSO4
4
3
2
6
Match the following to the description
SO3
1 sulfur, 3 oxygen
2SO3
2 sulfur, 6 oxygen
2S2O3
4 sulfur, 6 oxygen
3 SO4
3 sulfur, 12 oxygen
SO4
1 sulfur, 4 oxygen
Which element has the greatest number of atoms? AgNO3
Silver
Gold
Nitrogen
Oxygen
The ______ are numbers found on the lower right-hand side of an element symbol.
Coefficient
Exponent
Multiplier
Subscript
Coefficients in chemical formulas...
are found at the beginning of a formula and multiply just the first atom
are found at the end of a formula and multiply EVERYTHING!
are found at the end of a formula and multiply only elements inside the parentheses.
are found at the beginning of a formula and multiply EVERYTHING!
4CF2Cl3
carbon
4
fluorine
8
chlorine
12
Put the elements in order from smallest to largest number of atoms:
2C3H5(NO3)4
Carbon
Nitrogen
Hydrogen
Oxygen
3H2SO4
There are (a) Hydrogens, (b) Sulfurs, and (c) Oxygens
A ______ is a number written in front of a chemical formula.
Coefficient
Subscript
Exponent
Coordinator
What is a resource?
something found in nature
something we find valuable
something we use
both B and C
What is a natural resource?
a resource that occurs naturally
a resource that is man-made
Where are natural resources found?
in the woods
at the beach
in nature
under the ground
You can make synthetic products from these things...
Plant based resources
Animal based resources
Petroleum based resources
All of the above
What is a synthetic resource?
a resource made by humans from natural materials
natural resources such as trees and water
What is the difference between natural and synthetic resources?
Natural are man-made, synthetic are found in nature
Natural occur in nature, synthetic are man-made
There is no difference
We don't use natural resources but we use synthetic resources
Which is an example of a natural resource?
pencils
paper
books
trees
What is an example of a natural resource?
clothes
cotton
nylon
What is an example of a natural resource?
fish
fish sticks
fishing pole
What is an example of a synthetic resource?
plants
potatoes
potato chips
What is an example of a synthetic resource?
tree
branch
seed
chair
Which word is a synonym for synthetic?
real
artificial
natural
true
True or False: Synthetic materials are never made from natural resources
True
False
True or False: Natural resources must come from either plants, animals, or the earth.
True
False
True or False: Synthetic materials DO impact society.
True
False
Is burning wood a chemical or physical change?
Chemical
Physical
Is glass breaking a chemical or physical change?
Chemical
Physical
Is a rusting bicycle a chemical or physical change?
Chemical
Physical
Is melting ice a chemical or physical change?
Chemical
Physical
Is frying an egg a physical or chemical change?
Chemical
Physical
Which is an example of a chemical change?
Which is an example of a chemical change?
Which is an example of a physical change?
What is an example of a physical property?
color
flammability
reactivity
toxicity
Which is an example of a chemical property?
color
flammability
shape
size
Alicia wants to know how drinking milk affects how tall Monica grows. Which is the independent variable?
Monica's growth
drinking milk
Ramone wants to know: does the distance a person kicks a soccer ball effect how well they will do on their math test. What is the dependent variable?
How far they will kick the soccer ball
Who the person is
How well they do on the math test
Type of soccer ball
What would the INDEPENDENT variable be in an experiment testing which types of paper airplane goes furthest?
the paper used
the type of paper airplane
the distance of each plane's flight
how hard the plane is thrown
Marcos wants to know: Does the type of gasoline put in a car effect how fast the car can drive? What is the independent variable?
type of gasoline
which car the gas is put into
how fast the car can drive
how much gas is put into the car
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...
the type of plant
the amount of sunlight
the type of music
the type of liquid
Angelina set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.
distance traveled by the ball
height of the ramp
mass of the ball
who set up the experiment
Kreedence wants to know if birds prefer to eat in one place over another. She makes three feeders out of 2-liter bottles and paints all of them red. She fills each of the feeders with the same amount of mixed birdseed, and plans to keep the feeders out for 10 days before measuring how much seed is eaten from each feeder. She puts each of the feeders in her back yard: one feeder in a large dead tree, another feeder she sits on the dog house, and the last she sits in a small bushy tree.
What is the dependent variable?
length of the birdfeeders
amount of time feeders are outside
amount of seeds eaten
location the feeders are put in
Does the flavor of the ice cream effect how fast the ice cream melts? Is the underlined part the independent or dependent variable?
independent
dependent
Does the type of shoe worn during a 30 meter dash affect the speed of the runner? Is the underlined part the independent or dependent variable?
independent
dependent
How does increasing the slope of a ramp affect how far a marble travels? Is the underlined part the independent or dependent variable?
independent
dependent
What effect does decreasing the temperature of a room have on a lifespan of a battery? Is the underlined part the independent or dependent variable?
independent
dependent
How does watching TV during studying affect a student's test grades? Is the underlined part the independent or dependent variable?
independent
dependent
Does changing the scent of a brand of dog food affect how much the dog eats? Is the underlined part the independent or dependent variable?
independent
dependent
What is the effect on increasing the amount of sunlight given to tulips? Is the underlined part the independent or dependent variable?
independent
dependent
Which brand of bubblegum allows for you to blow the largest bubble? Is the underlined part the independent or dependent variable?
independent
dependent
How does adding cardio to one's daily schedule affect their heart rate? Is the underlined part the independent or dependent variable?
independent
dependent
A person's teeth will be whitened quicker if they use baking soda with their toothpaste. Is the underlined part the independent or dependent variable?
independent
dependent
An apple's freshness will last longer if they are refrigerated. Is the underlined part the independent or dependent variable?
independent
dependent
Does deflating a ball affect its ability to bounce? Is the underlined part the independent or dependent variable?
independent
dependent
In the chemical formula C12H22O11 , how many ELEMENTS are there?
1
2
3
4
In the chemical formula C12H22O11 , how many C atoms are there?
12
22
11
45
In the chemical formula C12H22O11 , how many O atoms are there?
12
22
11
45
In the chemical formula C12H22O11 , how many H atoms are there?
12
22
11
45
What is the TOTAL number of atoms in the chemical formula C12H22O11 ?
12
22
11
45
Which of the following substances CANNOT be broken down into simpler substances?
Na
H2O
C6H12O6
CO
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
during a chemical reaction, matter is destroyed
during a chemical reaction, the total number of atoms increases
during a chemical reaction, one or more new substances are formed
during a chemical reaction, the total amount of matter stays the same
What happens to the total mass of the substances after a chemical reaction?
it decreases
it increases
it remains the same
it increases then decreases
In a chemical reaction, the number of atoms in the products will always equal which amount?
the number of atoms in the reactants
half of the number of atoms in the reactants
twice the number of the atoms in the reactants
thrice the number of the atoms in the reactants
Jin bought a heat pack that weighs 15 g. He shook it so it would release heat to warm his hands. The release of heat indicates a chemical reaction took place in a closed system. What would be the mass of the heat pack after the chemical reaction?
5g
10g
12g
15g
The chemical formula for baking soda is NaHCO3 , how many O atoms does it have?
1
2
3
4
Matter can not be created nor destroyed: it can only be
destroyed a little bit
invisible
transformed, changed
none of the above
The number to the lower side of an element is a
subscript
superscript
coefficient
charge
The number in front of a compound or element is a
subscript
coefficient
superscript
charge
A chemical reaction is balanced when
both sides have the same elements
both sides have the same number of atoms
same subscripts
same coefficients
If reaction starts with 20g of reactants it should produce
a total of 40g of products
a total of 10g of products
a total of 80g of products
a total of 20g of products
What is the Law of Conservation of mass?
Mass is created in a chemical reaction
Mass is created in a physical change
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
Mass is never created or destroyed
Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?
50g
100g
200g
400g
How many atoms do you have in the compound 2MgCl2 ?
2
4
6
8
How many Ca (Calcium) atoms are found in Ca(OH)2 ?
5
3
2
1
In an endothermic reaction, heat is...
taken in
given out
In an exothermic reaction, heat is...
taken in
given out
Which of these processes is always exothermic?
evaporation
burning
insulation
melting
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic?
temperature rises by 3 °C
temperature falls by 5 °C
temperature falls by 3 °C
temperature rises by 5 °C
if a chemical reaction is EXOTHERMIC, the temperature would...
stay the same
increase
decrease
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.
warm
cold
Baking bread and cooking an egg are examples of....?
endothermic processes
exothermic processes
none of these
What type of reaction is shown in the photo?
exothermic
isothermic
endothermic
none of the above
Is photosynthesis an exothermic or an endothermic reaction?
endothermic
exothermic
What type of reaction occurs in a hand warmer?
exothermic
endothermic
When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as?
exothermic
activated
decomposition
endothermic
O2 + 2H2 ---> 2H2O + Energy
endothermic
exothermic
6CO2 + 6H2O + Energy ---> C6H12O6 + 6O2
endothermic reaction
exothermic reaction
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?
it is an exothermic reaction
it is an endothermic reaction
This is when heat is absorbed, it is an
exothermic reaction
endothermic reaction
both
none
When heat is released it is an
exothermic reaction
endothermic reaction
both
none
Your hands get cold outside from not wearing gloves
exothermic
endothermic
both
none
Fireworks are an example of
exothermic
endothermic
both
none
A melting ice cube is an example of
exothermic
endothermic
none
both
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
it is an exothermic reaction
it is an endothermic reaction
it is made of ice
it is dissolving in your mouth
What is potential energy?
the energy possessed by an object due to its position or condition
the energy possessed by an object due to its temperature
the energy possessed by an object due to its motion
the energy possessed by an object due to its color
Give an example of gravitational potential energy
a car moving at a constant speed
a ball held at a certain height above the ground
a book on a shelf
a person running on a treadmill
What is elastic potential energy?
the energy stored in an object when it is stretched or compressed
the energy stored in an object when it is heated up
the energy stored in an object when it is in motion
the energy stored in an object when it is at rest
Provide an example of elastic potential energy.
a compressed spring
a stretched rubber band
a coiled slinky
a stretched bungee cord
What is chemical potential energy?
the energy stored in the chemical bonds of a substance
the energy released when chemical bonds are broken
the energy required to initiate a chemical reaction
the energy produced by a chemical reaction
Give an example of chemical potential energy
wind
light
gasoline
water
What is kinetic energy?
the energy possessed by an object due to its rest
the energy possessed by an object due to its temperature
the energy possessed by an object due to its motion
the energy possessed by an object due to its position
Give an example of kinetic energy
blowing wind
burning candle
running water
moving car
What is the law of conservation of energy?
energy can be created and destroyed
energy can only be transferred
energy can be transformed into matter
energy cannot be created or destroyed, only transferred or transformed
What is an energy transformation?
an energy transformation is the process of destroying energy completely
An energy transformation is the process of creating energy out of nothing.
An energy transformation is the process of changing one form of energy into another form.
An energy transformation is the process of converting matter into energy.
Draw 3H2O
Put H in black and O in red.
