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Worksheets7th Grade Science Review Quiz
Total questions: 57
Worksheet time: 29mins
What is the main purpose of the scientific method?
To prove ideas correct
To solve problems in an organized way
To guess answers
To record opinions
Which step comes FIRST in the scientific method?
Experiment
Hypothesis
Question/Problem
Conclusion
Which step involves gathering background information?
Research
Analyze Results
Conclusion
Collect Data
Which step tests the hypothesis?
Research
Experiment
Conclusion
Question
What is a hypothesis?
A final answer
A testable prediction
A proven fact
A list of materials
Which step explains whether the hypothesis was supported or not?
Experiment
Analyze Results
Conclusion
Research
Why is data collected during an experiment?
To make a guess
To support or not support the hypothesis
To prove an idea true
To change the experiment
Why is analyzing results important?
It organizes materials
It looks for patterns or trends
It asks a question
It changes the hypothesis
What is a variable?
Something that never changes
Something that can change
A measurement tool
A conclusion
Which variable is changed on purpose?
Dependent variable
Controlled variable
Independent variable
Constant
Which variable is measured or observed?
Independent variable
Dependent variable
Controlled variable
Hypothesis
Why are controlled variables important?
They make the experiment faster
They make the experiment fair
They change results
They are measured
How many independent variables should be tested at a time?
As many as possible
Two
None
One
If plants are given different amounts of water, what is the independent variable?
Plant height
Type of soil
Amount of water
Sunlight
What is a physical property?
A change that forms a new substance
Something you can observe or measure
A chemical reaction
A permanent change
Which of the following is a physical property?
Ability to rust
Flammability
Density
Reactivity
Why is color a physical property?
It changes the substance
It forms a new substance
It can be observed without changing the substance
It requires a reaction
Which property describes how much space something takes up?
Mass
Density
Volume
Texture
Why is density considered a physical property?
It involves burning
It changes the substance
It can be measured without changing the substance
It creates gas
What is a chemical property?
A measurable size
How a substance can change into a new substance
Shape of an object
Amount of matter
Which is an example of a chemical property?
Color
Density
Flammability
Mass
Why is rusting a chemical property?
No new substance forms
The object changes shape
A new substance is created
The mass changes
What makes chemical properties different from physical properties?
They can be measured
They form new substances
They describe appearance
They use formulas
What happens during a physical change?
A new substance forms
The substance changes chemically
Only the appearance changes
Energy is released
Which is an example of a physical change?
Rusting
Burning
Melting ice
Baking bread
Why is cutting paper a physical change?
It creates a new substance
It changes the chemical makeup
It only changes size and shape
It releases gas
Does melting ice create a new substance?
Yes
No
Sometimes
Only at high temperatures
What happens during a chemical change?
Size changes
Shape changes
A new substance forms
Mass disappears
Which is evidence of a chemical change?
Melting
Color change
Cutting
Crushing
Which two signs show a chemical change has occurred?
Shape change and size change
Color change and gas bubbles
Freezing and melting
Volume and mass
Why does gas forming indicate a chemical change?
Gas always forms
A new substance is created
The substance melts
Mass disappears
Why are chemical changes difficult to reverse?
They change temperature
They create new substances
They involve solids
They change size
What is an atom?
A molecule
The smallest unit of matter of an element
A compound
A mixture
Which particle has a positive charge?
Electron
Neutron
Proton
Ion
Which particle has no charge?
Electron
Proton
Neutron
Atom
Where are electrons located?
In the nucleus
In the electron cloud
Inside neutrons
In compounds
Which particles make up most of an atom’s mass?
Electrons only
Protons only
Protons and neutrons
Neutrons and electrons
What is an element?
A mixture of substances
A pure substance made of one type of atom
A chemical formula
A compound
Where are elements found?
In mixtures
In compounds
On the periodic table
In experiments
What does the atomic number tell you?
Number of electrons
Number of neutrons
Number of protons
Atomic mass
Why is oxygen an element?
It has two atoms
It is chemically bonded
It is made of one type of atom
It can be separated physically
What is a compound?
A physical combination
A mixture of substances
A pure substance made of bonded elements
A single atom
Why is water (H₂O) a compound?
It is a mixture
It contains bonded elements
It can be separated physically
It is an element
How many hydrogen atoms are in H₂O?
1
2
3
4
Can compounds be separated physically?
Yes
Sometimes
No
Only solids
What is a mixture?
Chemically bonded substances
A new substance
Physically combined substances
A single element
What does density describe?
Size of an object
How much mass is in a given volume
Weight of an object
Shape of matter
What is the formula for density?
Mass × Volume
Volume ÷ Mass
Mass ÷ Volume
Length × Width × Height
Which two values are needed to calculate density?
Mass and height
Volume and height
Mass and volume
Length and width
If two objects have the same volume, which has higher density?
The one with less mass
The one with more mass
The larger object
The lighter object
What units are commonly used for density?
cm
g
g/mL or g/cm³
mL
How do you calculate the volume of a rectangular object?
Mass ÷ Volume
Length × Width × Height
Height ÷ Width
Final − Initial
When should water displacement be used?
For rectangular objects
For objects with straight sides
For irregular-shaped objects
For flat objects
Why does the water level rise when an object is placed in water?
Water evaporates
The object absorbs water
The object takes up space
The water freezes
What is the first step in water displacement?
Subtract measurements
Measure final water level
Measure starting water level
Add mass
If the water level starts at 30 mL and ends at 45 mL, what is the volume of the object?
15 mL
75 mL
30 mL
45 mL
What unit is used for volume of regular objects?
g
cm
cm³
mL/s
