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WorksheetsScience 7 FIRST QUARTER EXAM
Total questions: 50
Worksheet time: 25mins
Why do scientists use models like the one shown in class?
To show objects we can't directly observe
To collect viruses more safely in labs
To make displays for school exhibits
To increase interest in laboratory work
Why is the virus model much larger than the real virus?
So it matches other objects in size
So it avoids damage during transport
So it works better as a classroom display
So it's easier to show the virus structure.
Which situation is most similar to using a virus model to explain an idea?
Using a ruler to measure an object
Using marbles to show how gas particles move
Using flashcards to memorize definitions
Using a phone to record a lecture
What is one possible weakness of using models in science?
They may use parts that are hard to find
They may be too colorful to look realistic
They may not show how things truly behave
They may be heavier than actual objects
Which statement best describes the Particle Model of Matter?
Matter is made of energy that changes form
Matter is made of tiny particles with different properties
Matter is mostly solid and stays still
Matter is only made of visible things
According to the Particle Model of Matter, which of the following is TRUE?
All substances have the same kind of particles
Particles are visible under a magnifying glass
Each pure substance has its own type of particle
Particles can only exist in solid form
Why does the balloon inflate even though we cannot see the air entering it?
The balloon stretches because heat is added
The balloon absorbs invisible light
The balloon fills with particles that take up space
The balloon gains energy and moves upward
Why is it incorrect to say that an 'empty' glass has nothing inside?
The glass always contains some water vapor
The glass has invisible particles of air inside
The glass is too small to be completely empty
The glass reflects light, so it looks full
What happens to the movement of particles when they are heated?
They slow down and stop
They shrink and stay together
They move faster and spread out
They stick tightly and vibrate less
Which statement correctly describes particles in any state of matter?
Particles do not move unless stirred
Particles are always in motion
Particles can only move in liquids and gases
Particles only move when touched
Why did the chocolate powder dissolve faster in hot water?
The heat makes the spoon stir faster
The powder is lighter in hot water
The faster-moving particles spread the powder quicker
The hot water particles turn into gas
Why don't the water particles completely separate even though they are moving fast?
They are heavy and cannot move too far
They attract each other and stay close
They only move in one direction
They are trapped by the cup's shape
Which statement best describes the arrangement of particles in a solid?
Loosely packed and moving randomly
Closely packed and vibrating in place
Widely spaced and moving freely
Moving rapidly in all directions
Julio places the three cups in a row: ice, water, and steam. Which diagram best matches the arrangement of particles in the cup of steam?
Particles tightly packed and still
Particles moving slightly but staying close
Particles far apart and moving fast
Particles in straight lines with no space
If Julio shakes the cup of liquid water gently, what would most likely happen to the water particles?
They break apart into smaller particles
They flow past each other more freely
They stop moving completely
They line up into a rigid pattern
Julio heats the cup with liquid water until it becomes steam. How does this affect the particles?
They stick together more tightly
They move slower and stay in place
They move faster and spread apart
They turn into a solid and stop moving
What happens to the particles of a substance when it melts?
They stop moving completely
They vibrate slower and stick together
They move faster and spread farther apart
They combine to form larger particles
Why did Erika's ice cream melt when left outside?
The cold air added energy to the particles
The room temperature increased the particle energy
The freezer turned the particles into steam
The ice cream reacted with air and changed form
Erika now boils water in a kettle. Which particle diagram best represents what happens inside the kettle as it boils?
Tightly packed and still particles
Loosely arranged particles with slow motion
Rapidly moving particles far apart
Particles locked in one position
During melting, what is the main cause of the particles spreading out?
The particles are attracted by air molecules
The spoon stirs the particles faster
The added heat increases their energy
The flavoring causes separation
Which of the following best explains why freezing reverses the process of melting?
Removing heat slows particles and brings them closer
Freezing removes color, so motion stops
Cold makes particles stick because of their shape
Ice forms because cold air pushes on the liquid
Which step of the scientific method comes first?
Collecting data
Drawing a conclusion
Asking a question
Testing a hypothesis
Miguel thinks the plant wilted because it wasn't getting enough sunlight. What step is he doing?
Planning the experiment
Making a hypothesis
Drawing a conclusion
Asking a question
Miguel places one plant in the shade and another in sunlight, then records their growth. What part of his setup is the independent variable?
The plant height
The amount of sunlight
The number of leaves
The water in the soil
He finds that the plant in sunlight grew more leaves. What should Miguel do before making a conclusion?
Publish his findings
Compare his data with other classes
Repeat the experiment to verify results
Draw a diagram of the plant
Miguel concludes that light helps plants grow. Which of the following best shows he followed a good investigation?
He made a guess and wrote it in his notebook
He repeated the test and got similar results
He gave water to all the plants
He showed the plant to his teacher
Which instrument is most appropriate for measuring the temperature in this experiment?
Weighing scale
Thermometer
Ruler
Stopwatch
Which conclusion is best supported by the data in the table?
Foil keeps water cooler than paper but not better than cloth
All materials keep water equally cold
Paper is the best insulator because it absorbs water
Foil works better than cloth at keeping water cool
Angela wants to make a line graph using the data. What should be placed on the x-axis?
Types of insulation
Temperature
Time in minutes
Amount of water used
If Ramon wants to display the final temperature of each material only (at 30 minutes), which graph is most appropriate?
Bar graph
Line graph
Circle graph
Pictograph
Angela wants to make a data table to show the experiment results clearly. Which column headers should she use?
Temperature, Time, Weight
Material Type, Initial Temperature, Final Temperature
Time, Material, Degree of Coldness
Experiment Name, Ruler Reading, Stopwatch Time
In the orange juice solution, what is the solute?
The glass
The water
The orange powder
The stirring spoon
What role does the water play in the orange juice mixture?
It makes the powder float
It colors the powder
It acts as the solvent
It turns into a solid
Why is the orange powder considered the solute?
It is the larger part of the solution
It changes color during mixing
It dissolves in the water
It is poured into the container last
Which of the following best describes a solution?
A mixture where one substance dissolves in another
A mixture of solids and liquids that can be separated
A group of chemicals with the same properties
A change in temperature and color only
What is the term used to describe the amount of solute in a given amount of solution?
Mass
Volume
Concentration
Temperature
If Gino uses 50 g of powder in 500 mL of water, what is the concentration?
5%
10%
15%
20%
Which batch has the highest concentration?
A
B
C
D
Gino says that Batch B tastes the same as Batch A. Based on the data, is he correct?
Yes, because they have the same concentration
No, because Batch B has more water
Yes, because both used powder
No, because Batch B is larger
Gino wants to prepare a new batch with a concentration of 15%. Which combination should he use?
15 g powder in 100 mL water
30 g powder in 200 mL water
20 g powder in 150 mL water
10 g powder in 150 mL water
Which of the following best defines solubility?
The ability of a substance to float
The ability of a solute to dissolve in a solvent
The speed of stirring a liquid
The mass of sugar in a cup
Based on Kyle's results, in which cup did sugar dissolve the fastest?
Cold water
Room temperature water
Hot water
All cups were the same
Why does sugar dissolve faster in hot water?
Hot water has more space for sugar
The sugar is lighter in hot water
Heat increases particle movement, helping sugar dissolve
Sugar breaks into smaller pieces in hot water
Kyle repeated the experiment but stirred the cold water faster than the hot water. He said cold water now dissolves sugar faster. What is the problem with his conclusion?
He didn't use the right type of sugar
He changed more than one variable
He used different cups for the test
He should have frozen the water instead
What color does blue litmus paper turn in the presence of an acid?
Blue
Green
Yellow
Red
Why is baking soda solution classified as a base?
It turns red litmus paper red
It turns blue litmus paper red
It turns red litmus paper blue
It has no effect on litmus paper
Saltwater did not change the color of either litmus paper. What does this mean?
It is acidic
It is basic
It is neutral
It is toxic
What is the safest way to smell a chemical in the lab, if required?
Take a deep breath over the container
Waft the air gently toward your nose
Sniff directly from the test tube
Remove your mask and inhale deeply
Why is the student in the image using tongs to hold the test tube?
To keep the test tube clean
To keep it away from other materials
To protect hands from heat or spills
To avoid breaking the glass
What is the correct way to read the temperature on the thermometer in a beaker of water?
Hold it by the bulb and lift it out of the water
Read the level while the bulb touches the beaker’s bottom
Read the scale while it is held upright in the liquid, not touching the bottom
Lay the thermometer flat on the table after removing it
