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WorksheetsGrade 8 8I Review
Total questions: 40
Worksheet time: 22mins
States of matter vary in the way they maintain(or don't) their...
volume
mass
shape
atoms
Which state of matter will keep its volume, but not its shape if it changes containers?
Solid
Liquid
Gas
This theory explains the properties of different states of matter
Atomic theory
Property theory
Matter theory
Particle theory
A substance can diffuse (do diffusion) in which states of matter?
Solid
Liquid
Gas
What term describes the random movement of particles in a liquid or gas?
Brownian Motion
Diffusion
Movement
Spreading
Most substances _________ when heated and ________ when cooled (get colder)
expand; don't change
expand; contract
contract; expand
Don't change; expand
A substance expands because the particles...
Move faster and take up less room
move slower and take up more room
Move faster and take up more room
move slower and take up less room
What is density?
The amount of atoms in a certain compound
The amount of mass in a certain volume
The amount of mass in a certain time
The amount of atoms at a certain temperature
What weighs the most (has the biggest mass)?
50g of metal
2kg of water
900g of wood
7kg of air
What takes up the least space (smallest volume)?
50g of metal
2kg of water
900g of wood
7kg of air
How do you calculate density?
mass*volume
volume*mass
mass/volume
volume/mass
What is volume?
The mass of something
The amount of space something takes up
The weight of something
The atoms of something
When measuring volume, we can use ml (milliliters) or cm^3 (cubic centimeters). How are they related?
They are not related
100 ml = 1 cm^3
1 ml = 100cm^3
1 ml = 1 cm^3
What could cause the volume of a substance to change?
Change the temperature of the room
Change the volume of the container
Change the lighting of the room
Change the colour of the container
What is it called when matter of a substance changes state (ex. from solid to liquid)?
Change of Acid
Change of Substance
Change of Matter
Change of State
A liquid becomes a solid when it reaches its...
Melting point
Condensation point
Freezing point
Boiling point
Which process is the same change of state as 'evaporation'?
Freezing
Boiling
Condensation
Melting
What is the difference between the processes 'evaporation' and 'boiling'?
They are the same
Evaporation starts at a higher temperature than boiling
evaporation happens only at the surface of a liquid and boiling happens everywhere in the liquid
Evaporation is for all liquids, boiling is only for water
When a gas is cooled, it will...
condense
expand
move
react
The Freezing point will be the same temperature as the
Melting point
Condensation point
Sublimation point
Boiling point
If a substance has a sublimation point then it will never exist as a ______, even if the temperature increases or decreases (at that pressure)
Solid
liquid
fluid
gas
Which changes of state results in an expansion of a substance?
Liquid->solid
Solid->gas
Liquid->gas
gas->liquid
What is anomalous(special) about water?
It expands when going from liquid to solid
It does not have a gas state(phase)
It is an element
It does not have a density
The particles in a fluid (gas or liquid) are moving around in all directions and bumping into each other and surfaces.
The force of these particles hitting things is the _____.
Gravity
Force
Density
Pressure
Who will have the most pressure exerted on them?
The boy in the tube
The girl
the octopus(章魚)
The shark(鯊魚)
Why is the air pressure lower on top of a mountain than it is at KCIS?
Because the kind of air is different
Because there is more air above you at KCIS than on the mountain top
Because there is less air above you at KCIS than on the mountain top
Because the air density is less at KCIS than on top of the mountain
What could you do to make this bag of chips pop?
Drive to the top of a volcano
Dive underwater with the bag
Shake the bag
Bring the bag into your basement
People sometimes get sick when they climb to the top of very tall mountains. This is called 'altitude sickness' and is caused by...
Pollutants on the top of mountains from fossil fuel combustion
The decrease in blood density at higher altitudes
The decrease in oxygen density in the air at higher altitudes
The nobel gases in the air
What could I do to change the pressure of a gas?
Change the temperature
Change the volume of the container
Change the colour of the gas
Change the mass of the gas
This is the unit we use to measure pressure
grams (g)
pascals (Pa)
millilitres (mL)
kilograms per milliliter (kg/mL)
Increasing the temperature of a gas also increases the pressure of the gas because...
it makes the gas' container smaller, meaning more collisions with the container
it increases the speed of the gas particles, meaning more collisions with the container
It cause the pH to increase, which causes more collisions between the gas molecules
It increases the density of the gas, which causes more collisions between the gas molecules
Choose which forces are acting on a person who is standing on the ground
Gravity
The power of the floor
Drag
Water resistance
When you float in water, you feel like you weigh less because of upthrust. How does this work?
The upthrust of the air helps you float
The upthrust of your body moves you up
The upthrust of the water that your body moved pushes you up
The upthrust of the ocean floor pushes you away
Upthrust only happens when an object floats
True
False
The density of water is 1.0 g/cm^3. What are possible densities for objects that will float in water?
3.7 g/cm^3
-1.0 g/cm^3
0.71 g/cm^3.
101.0 g/cm^3
Any object moving through water or air will have a resistance force on it that will slow it down. This force is called..
gravity
drag
speed
air
Smooth shaped (Streamlined) cars have higher speeds because they have ______ than rough shaped cars
more power
more drag
Less mass
less drag
How does the speed of a car affect the drag on the car?
Increasing speed increases drag
Increasing speed decreases drag
Increasing speed gets rid of drag
Speed does not have any effect on drag
When a car is traveling at a constant (the same) speed, what does this tell us about the force of the engine and the force of drag?
The force of the engine is greater than the force of the drag
The force of the engine is less than the force of the drag
The force of the engine is the same as the force of the drag
The force of the engine is increasing but the force of the drag is staying the same
A car's top (highest) speed is reached when...
The force of the engine can increase but the force of the drag cannot.
The force of the drag can increase but the force of the engine cannot.
The force of the engine and the force of the drag can both increase
The force of the engine and the force of the drag both decrease.
