Science review 1
It rained on a hot summer afternoon and a puddle formed. After a few hours, the puddle disappeared. Which two processes made the puddle form and then disappear?
A. precipitation, then evaporation
B. condensation, then evaporation
C. precipitation, then runoff
D. evaporation, then precipitation
B. condensation, then evaporation
What is the purpose of recording the properties of the substances both before and after they are combined?
A. to determine if substances can have color
B. to determine which mixture is the heaviest
C. to determine which mixture formed the fastest
D. to determine if new substances have been made
D. to determine if new substances have been made
In a lab demonstration, Mr. Sharpe placed a piece of zinc into a glass beaker containing hydrochloric acid. When the two substances were mixed, the zinc turned black and hydrogen gas was released. What happened during the reaction?
A. The zinc and hydrochloric acid changed, creating products with different properties.
B. The zinc and hydrochloric acid all combined, creating one product with the same
properties.
C. Some of the zinc and hydrochloric acid became energetic, causing the zinc to
evaporate the hydrochloric acid.
D. Some of the zinc and hydrochloric acid escaped, leaving behind smaller amounts of
the same zinc and hydrochloric acid.
A. The zinc and hydrochloric acid changed, creating products with different properties.
the force that pulls objects toward one another
Gravity
the use of force to move an object a distance
Work
2 or more forces acting together on an object
Net Force
an objects speed in a particular direction
Velocity
a measure of the distance an object moves in an amount of time
Speed
A push or pull that causes an object to move, stop, or change direction
Force
a force between surfaces that causes them to resist motion
Friction
What does the Law of Conservation of Mass say?
Matter is never created or destroyed, but transformed into a different form.
Which is a function of the digestive system?
A. to create blood
B. to circulate blood
C. to produce oxygen
D. to turn food into nutrients
D. to turn food into nutrients
What is the process by which plants make energy from the sun?
photosynthesis
a change in speed or direction
acceleration
equal forces acting on a object in opposite directions
Balanced Force
What is the process by which dry ice transforms from a solid to a gas without going through the liquid phase?
sublimation
Which of these is a mixture?
A. carbon dioxide
B. water
C. salt water
D. sugar
C. salt water
What would be the BEST evidence that a new substance has formed?
A. The resulting substance is the same state as the two original substances.
B. The resulting substance is heavier than the two original substances.
C. The resulting substance has different properties than the two original substances.
D. The resulting substance takes up more space than the two original substances.
C. The resulting substance has different properties than the two original substances.
Where do all living things on the earth originally get their energy from?
The sun
How does the muscular system differ from the skeletal system?
A. The muscular system helps the body move.
B. The muscular system does not include bones.
C. The muscular system functions independently from other systems.
D. The muscular system is dependent on other systems to function
properly.
B. The muscular system does not include bones.
What is evaporation?
a . gas turns to liquid
b. solid turns to liquid
c. liquid turns to gas
d. water turns to ice
c. liquid turns to gas
Which has more energy: a 50 kg rock or a 100 kg rock?
100 kg rock because more mass=more energy!
Frank has a beaker with a mixture of salt and water. He would like to recover the salt from the water. Which would be the best method to accomplish this?
a. evaporation b. reflection
c. freezing d. refraction
a. evaporation
Which of Newtons law is this.. " Law of inertia" an object at rest will stay at rest and an object in motion will stay in motion until a force acts upon it.
Newtons 1st Law
which law is - " Law of acceleration" The greater the force, the greater the acceleration
2nd
Characteristics of a substance that can be observed
Physical Properties
What are the some evidences of a chemical change?
Odor
Color
Precipitate
Gas
Temperature change (sometimes light and sound)
Which system is responsible for protecting most internal organs?
A. digestive
B. cardiovascular
C. circulatory
D. skeletal
D. skeletal
combination of substances that cannot be easily separated
solution
object 1= 15 g object 2= 30 g
Which object must you apply more force to in order to move it?
object 2
F=m x a
the ability of a substance to dissolve
solubility
Which is an example of a chemical change?
a. melting ice
b. dissolving salt in water
c. hammering metal into a thin sheet of foil
d. burning a piece of paper
d. burning a piece of paper
If the evaporation phase of the water cycle were removed, what is most likely to happen?
A. There would be no lakes.
B. There would be increased runoff.
C. There would be a buildup of clouds.
D. There would be no more precipitation.
D. There would be no more precipitation.
John's father cooks on his outdoor grill by burning wood. John notices that the wood turns into ashes at the bottom of the grill as it burns. John claims that this is a chemical change.
Which statement BEST supports his claim?
A. The ashes are a new mixture.
B. The ashes are a different shape.
C. The ashes are a new substance.
D. The ashes are a different state of matter.
C. The ashes are a new substance.
has definite volume but no definite shape
Liquid
Has no definite shape or volume
Gas
Changes a substance from a liquid to a solid
Freezing
Which Law states.. For every action,there is an equal and opposite reaction.
3rd law
Process by which a liquid changes into a gas
Evaporation
change in matter that does not affect chemical composition ( no new substance formed)
Physical Change
How do oceans best contribute to the water cycle?
A. They provide much of the needed water during the process of evaporation.
B. They provide the least amount of needed water during the process of evaporation.
C. They provide much of the water through the process of transpiration from seaweed.
D. They reflect much of the sun’s heat, which limits the amount of water that will be evaporated.
A. They provide much of the needed water during the process of evaporation.
The starting substance in a chemical reaction
Reactant
A student wanted to look at pond water to see what organisms they could find. Which of the following tools would the student use?
a. balance b. graduate cylinder
c. microscope d. magnifying glass
c. microscope
A vehicle traveled 30 meters in 6 seconds. Calculate its speed.
5 m/s
process that changes substances into new substances ( substance can never change back)
Chemical Change
the new substance of the reaction
Product
the chemical property of being able to burn
Combustibility
In which situation is a chemical reaction not taking place
a. salt dissolving in water
b. rusting of an old car in a junk yard
c. burning gasoline in a car
d. digestion of food in our body
a. salt dissolving in water
The motion of atoms and molecules that creates a change in temperature
Thermal Energy
the flow of heat through a liquid or gas, causing hot parts to rise and cooler parts to sink
Convection
the passing of heat through a material while the material itself stays in place
Conduction
the transfer of heat through electromagnetic rays
Radiation
a material that reduces or prevents heat from passing through
Insulator
a material that allows heat to pass through it while the material itself stays in place
Conductor
Which is the best example of a chemical change?
a. fireworks exploding
b. cutting paper
c. crushing a can
d. melting snow
a. fireworks exploding
Process by which a gas changes into a liquid
Condensation
Bob wants to determine at what ramp height will a cart roll the fastest. What would be his independent variable?
a. speed of the cart
b. ramp length
c. ramp height
d. none of the above
c. ramp height
a wave that travels at the speed of light through space due to radiation
Electromagnetic Waves
objects ____ as they are heated
Expand
8. Which best compares the circulatory system to the muscular system?
A. The muscular system transports red blood cells, while the circulatory system moves the body.
B. The circulatory system transports red blood cells, while the muscular system moves the body.
C. The muscular system transports oxygen, while the circulatory system transports red blood cells.
D. The circulatory system transports oxygen, while the muscular system transports red blood cells.
B. The circulatory system transports red blood cells, while the muscular system moves the body.
a mixture between a liquid and particles of a solid. In this case the particles do not dissolve. Particles are suspended in the liquid.
Suspension
a measure of the pull of gravity on an object
Weight
dyes which measure the strengths of acids and bases
Indicators
Why are more types of organisms found in the shallow part of the ocean than in very deep ocean water?
A. There is more salt.
B. There is more light.
C. There is more sand.
D. There is more wave action.
B. There is more light.