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WorksheetsScience 7 Reviewer
Total questions: 48
Worksheet time: 27mins
What do we call anything that occupies space and has mass?
Gas
Liquid
Matter
Solid
What state of matter is characterized by having a definite shape and a definite volume?
Gas
Liquid
Solid
Plasma
Why do scientists use models?
They are exact representations of reality.
They only exist in computer simulations.
They are always simple and easy to understand.
They can be used to test ideas and make predictions
What substance is cannot be broken down into simpler substances by chemical reactions?
compound
element
molecule
nucleus
What object is consist of two or more atoms that chemically bonded together?
nucleus
molecules
particles
solid
Which of the following states of matter has particles arranged most closely together?
Solid
Liquid
Gas
All of the above
What do you call the process of changing a solid into liquid by heating it?
Melting
Freezing
Evaporation
Condensation
In which state of matter do particles have the most freedom of movement?
Solid
Liquid
Gas
All of the above have the same freedom of movement.
What can be a limitation of scientific model?
They are never updated or improved.
They are only used in physics, not other sciences.
They are all based on real-world data.
They cannot perfectly capture all the complexities of a system
What process is involved in everyday fog formation?
Melting
Boiling
Evaporation
Condensation
Which of the following CAN NOT be a scientific model for the atom?
A song with lyrics full of subatomic particles and their charges
An image (picture, concept map, flowchart, etc.) that considers all laws of science
A round Styrofoam colored with parts representing electrons and other subatomic particles
A computerized interactive game where you can put subatomic particles and guess the correct image for atom
Why is the Plum Pudding Model helpful for scientists?
It shows how atoms are mostly empty space.
It shows how atoms are indivisible particles.
It shows electrons have specific energy level
It shows the nucleus is the most massive part of the atom
What is the characteristic of solid particles as seen in its particle model?
Moving freely and spread far apart.
Arranged in a specific pattern but with large gaps
Vibrating in place with minimal space between them.
Flowing around each other and constantly changing positions.
What can you say about the particles of liquid in contrast with a solid?
A predictable pattern of movement.
The same amount of movement and spacing.
Less movement and are more tightly packed.
More freedom to move and more spaces between them
What happens to the particles of a material being heated?
Slightly compacted but can move
Gains more definite shape and compactness
Moves farther away from each other
Nothing happens because heat is not absorbed
What would you do if you are being told to convert solid to liquid?
Store the pack of water into the refrigerator.
Melt down the ice by boiling it into a hot pot
Blow some air to a big plastic to create a huge balloon
Bake the cake into the oven.
An unknown white substance is heated and produced white smoke and black solid. What do you think is this substance?
a mixture
an element
a compound
a diatomic molecule
Water is composed of two atoms of hydrogen and one atom of oxygen. Which of the following can be the particle model for water?
What can you say about the movement (speed) of the particles of solid, liquid, and gas based on this model?
The speed of the particles is the same in all states of matter.
Solid particles are the fastest to move compared to liquid and gas.
Gas particles are the fastest among solids and liquids.
The speed of the particles is not affected by temperature.
What do you think is happening in the substance in terms of temperature change?
Temperature dropped and solidified the substance.
Temperature was increased, and the substance was liquified.
The liquid substance was heated and evaporated as gas.
The liquid substance was frozen and became solid.
How did the Kinetic Molecular Theory describe the particles of a solid?
Only vibrating in place.
Constantly moving with large spaces between them.
Completely still and packed together.
Constantly moving with very small spaces between them
What is the movement of the particles in a gas?
Not moving at all.
Moving rapidly with large spaces between them.
Moving very slowly and tightly packed together.
Moving very slowly with large spaces between them.
Which has a direct relationship with temperature?
Size of its particles.
Type of intermolecular forces present.
Shape of its particles.
Average kinetic energy (speed) of its particles.
According to Kinetic Molecular Theory, what happens to the particles in a substance as its temperature increases?
They move faster.
They move slower.
They stop moving.
Their arrangement doesn't change.
In which state of matter do particles have the most freedom of movement?
Solid
Liquid
Gas
All of the above have the same freedom of movement.
What happens to the particles of a substance during melting?
Gain energy and move faster.
Don't change their energy or arrangement.
Lose energy and move slower.
Change their arrangement but not their speed.
Which of the following is NOT a factor affecting condensation?
Pressure
The color of the surface
Temperature
Presence of water vapor in the air
What happens to the particles as a gas cool down and condenses?
Gain energy and move faster.
Lose energy and move closer together.
Gain energy and move slower.
Lose energy but maintain the same spacing.
What is the factor you deliberately change or manipulate in your experiment to see its effect on something else?
Hypothesis
dependent variable
controlled variable
independent
Which is the independent variable?
the amount of water
the amount of sugar
the times of stirring
the temperature of water
Which is the dependent variable?
the dissolving time of sugar
the heating time of water
the number of granules left
the temperature of water
What are factors that you keep the same throughout the experiment to ensure a fair testing?
Hypothesis
dependent variable
controlled variable
independent
Mary wants to know at which temperature does the sugar dissolve faster in water. What is the independent variable in the situation?
the amount of water
the type of water
the source of water
the temperature of water
Which are the controlled variables? (refer to Question 35 for the experiment performed)
Water temperature
Amount of water
Amount of sugar
Dissolving time of sugar
Stirring time
How can a scientist know if his/her hypothesis is effective or not?
rely on wild guess
test hypothesis thru testing
observe from others
conclude based on gathered info from others
What skill does a scientist show when he/she listens to the sounds that whales make?
Making a hypothesis
Making observations
Interpreting data
Drawing conclusion
Which question would be the best high-level Scientific question?
How many giraffes live in Africa?
How long ago did dinosaurs live on Earth?
Who made the first microscope?
Does the amount of salt in water affect the temperature at which it boils?
What do you call the series of steps designed to help you solve problems and answer questions?
Experiment
Observation
Hypothesis
Scientific Method
In science, an educated guess is called a/an _______________.
Conclusion
Observation
Hypothesis
Question
When you decide whether the data supports the original hypothesis, you are ________________.
Asking questions
Drawing conclusions
Making observations
Forming a hypothesis
When a scientist shares her findings with other scientists, she is _________.
Experimenting
Making a hypothesis
Analyzing data
Communicating Results
The final part or a summary of reasonable inferences is/an __________.
Conclusion
Question
Hypothesis
Controlled experiment
All good experiments should be _____________.
Explainable
Testable
Questionable
Thoughtful
All the following describes a solution EXCEPT:
Clear
homogeneous
Cannot pass through filter paper
Can be separated by physical means
Which is an example of a solution?
Cooked flour
Marshmallow
Seawater
Blood
The two components of a solution are solute and solvent. Which statement describes the solute?
It is the solid formed in a solution.
It is the liquid component of the solution.
It is the component of a solution in smaller quantity.
It is the component of a solution in bigger quantity.
What is the reason why homogeneous and heterogeneous mixtures are different?
Heterogeneous has 2 substances while homogeneous has 3 or more substances.
Homogeneous looks the same throughout, with heterogeneous you can see the different parts.
Heterogeneous looks the same throughout, with homogeneous you can see the different parts.
Both have an equal number of substances.
Which of the following is a homogeneous mixture?
Oil and water
Sand and water
Halo-halo
Air
