Worksheets8th Grade Science Review #3
Total questions: 53
Worksheet time: 11hrs 21mins
Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. From his observation and research, he concludes that the substance goes through a chemical change when heated. How can Ethan best defend his conclusion?
by demonstrating that the substance will eventually melt if the temperature continues to increase
by verifying that the substance is now made up of different molecules than before it was heated
. by verifying that the substance is made up of only one type of element
by demonstrating that the substance is less dense after it is heated
2 Mr. Roberts drives his car away from his house at a constant speed. Which of the following graphs best shows the relationship between the distance traveled and the time spent driving?
Ice forms in the cracks of a basalt rock formation and breaks some rock into smaller pieces. The diagram below shows part of the rock cycle.
At which point in the cycle shown above would the process of breaking down rocks occur?
J
K
L
M
Students in Ms. Alvarez’s eighth grade science class are investigating how temperature, in degrees Celsius (˚C), affects the solubility of a compound in 100 milliliters (mL) of water. Ms. Alvarez provides the students with a graph that shows the solubility of a certain compound, as shown here.
She then tells the students that she will demonstrate how many grams (g) of the compound will dissolve in 100 mL of water at 40˚C. Based on the information in the graph, which of the following is the best prediction of how many grams of the compound will dissolve at 40˚C?
40g
65g
85g
100g
An object moves through space with balanced forces acting on it. Which statement best describes the speed and direction of the object as long as the forces acting on it remain balanced?
The speed and direction of the object will both change.
The speed and direction of the object will remain constant.
The speed will change, but the direction will remain constant.
The speed will remain constant, but the direction will change.
A scientist performs an experiment and asks other scientists around the world to replicate it. Why would other scientists most likely try to perform the same experiment?
to find out if weather of various regions of the world would affect the results
to see if the experiment would be less expensive in another part of the world
to confirm the results of the experiment conducted by the scientist
to verify that the hypothesis of the experiment is a scientific law
Food webs show feeding relationships among different types of organisms. Those organisms each have a specific niche. Which of the following best describes a function of decomposers in food webs?
to recycle nutrients into soil
to convert solar energy into food
to provide food for secondary consumers
to compete with secondary consumers for oxygen
The interaction between the cryosphere and hydrosphere can have an impact on Earth’s oceans. Which of the following is an example of an interaction between the cryosphere and hydrosphere?
evaporation of water from oceans at the equator
release of fresh water into ocean water as icebergs melt
decomposition of organic matter at the bottom of oceans
release of large amounts of salt from icebergs into the ocean
Several factors can cause weather patterns in the atmosphere. The diagram below shows how air movement near the equator can form thunderstorms.
Which process is the main source of this movement?
movement of ocean currents
decrease in relative humidity
heating by energy from the Sun
warming in the upper atmosphere
Based on information from the graph, which of the following best compares the physical properties of two of the substances?
Substance X has less mass than substance Y has
Substance W has less volume than substance X has.
Substance Y would have less mass than substance Z would have if they had the same volume
Substance Z would have less mass than substance W would have if they had the same volume.
According to the bar graph, what percent of the people choose Country or Rock as their favorite type of music??
20%
40%
45%
60%
There are 20 students in a class. What percent of the students have 4 books in their desk?
20%
25%
30%
32%
A
B
C
D
The range of the data for Fun Fit is less than the range of the data for Greg’s Gym.
The median for Greg’s Gym is less than the median for Fun Fit.
The minimum attendance for Fun Fit is less than the minimum attendance for Greg’s Gym.
The interquartile range for Greg’s Gym is greater than the interquartile range for Fun Fit.
A
B
C
D
F
G
H
J
F
G
H
J
A middle school conducted a survey of randomly selected 6th graders about their favorite class. The table shows the results of the survey.
Which inference about all 7th graders at this school is best supported by this information?
The number of 7th graders who chose Language Arts as their favorite class is greater than the number of 7th graders who chose Science.
The number of 7th graders who chose Math as their favorite class is less than the number of 7th graders who chose Language Arts.
The number of 7th graders who chose Math and Social Studies as their favorite class is less than the number of 7th graders who chose Science.
The number of 7th graders who chose Science as their favorite class is triple the number of 7th graders who chose Social Studies.
Based on the graph,how many more sunny days than rainy days did this city have during the months of April, May, and June?
f
g
h
j
The school counselors conducted a survey of randomly selected seventh and eighth graders about the way the students get home from school. The graph shows the results of the survey.
Based on the results, which of the following does NOT represent the data? (7.12B, SS).
60% of the 8th graders rode the bus home.
A total of 50 students were surveyed.
Exactly half of the students surveyed rode the bus.
The number of car riders and walkers in 8th grade is equal to the number of car riders in 7th grade.
Sci-Fi and Action
Sci-Fi and Musicals
Action and Musicals
Action and Cartoons
A car and two buses are driving on a highway. The blue arrows represent the direction and magnitude of each vehicle's motion relative the the ground. Select the answer that correctly shows the relative direction and magnitude of each vehicle's motion from the reference point of the car.
A geologist is investigating the history of an area that has experienced various geological events, including sedimentation, erosion, tectonic deformation, and volcanic eruptions. The diagram shows the cross section produced from her study. Which answer correctly explains how the geologist knows the relative age of the intrusion compared with that of the gravel.
Because the intrusion is an igneous formation and the gravel is a sedimentary formation there is no way know which one is older.
Igneous rock is always younger then sedimentary rock.
The gravel is older because it is on top.
The gravel is younger because it is on top and the intrusion does not cut through it.
A geologist is investigating the history of an area that has experienced various geological events, including sedimentation, erosion, tectonic deformation, and volcanic eruptions. The diagram shows the cross section produced from her study. Which statement correctly explains how the geologist knows that the flow is older than the intrusion.
Because both the flow and the intrusion are igneous formations it is impossible to tell which one is older.
Because the flow has been bent by plate movement and the intrusion has not means flow is older because the flow was formed before the plate movement and the intrusion after the plate movement.
They are the same age because they both start at the bottom of the cross section.
The flow is older because it stays lower in the cross section and the intrusion starts low and goes higher.
Several fish species became extinct millions of years ago. The graphs show the distribution of fossils of these fishes as they occur in several undisturbed layers of sedimentary rock observable in a cliff face. Which inference can be made about the fish species extinction in figure number 1?
The steep straight line slope shows a rapid decline in the population of the fish species indicating a rapid change in the environment.
The steep straight line slope shows a gradual change in the declining population of the fish species indicating the environment changed slowly over time.
A steep increase in the population of the species cause the resources of the environment to be used up and cause a crash in the population and eventual extinction.
It is not possible to make an inference about the extinction of the species based on the information in figure number 1.
Several fish species became extinct millions of years ago. The graphs show the distribution of fossils of these fishes as they occur in several undisturbed layers of sedimentary rock observable in a cliff face. Which inference can be made about the fish species extinction in figure number 2?
The gradual decreasing slope of the line shows a rapid decline in the population of the fish species indicating a rapid change in the environment.
The gradual decreasing slope of the line shows a gradual change in the declining population of the fish species indicating the environment changed slowly over time.
A steep increase in the population of the species cause the resources of the environment to be used up and cause a crash in the population and eventual extinction.
It is not possible to make an inference about the extinction of the species based on the information in figure number 2.
What are two sources of thermal energy in the Earth's interior?
solar heating and gravity
combustion and solar heating
gravity and radioactive decay
radioactive decay and combustion
A person is standing in the middle of a boxcar on a train moving 100 km per hour. If the motion of the boxcar remains constant, where in the boxcar will the person most likely land after he jumps straight up?
One bar magnet sits on a table, and a rubber band suspends another magnet above it. In the view on the left, the upper magnet is held in place and cannot move. In the view on the right, the upper magnet has been released. How did the potential energy change when the upper magnet was released?
Magnetic, elastic and gravitational potential energy increased.
Magnetic, elastic and gravitational potential energy decreased.
Magnetic and elastic potential energy increased, and gravitational potential energy decreased.
Magnetic and gravitational potential energy decreased, and elastic potential energy increased.
An engineer is collecting data on four different satellites orbiting Earth. The engineer records the satellites' distances from Earth in kilometers (km) and their forces due to gravity in Newtons (N). Estimate the force due to gravity for satellite number 2.
equal to 17,000 Newtons
greater than 17,000 Newtons
less than 17,000 Newtons
An engineer is collecting data on four different satellites orbiting Earth. The engineer records the satellites' distances from Earth in kilometers (km) and their forces due to gravity in Newtons (N). Estimate the distance in kilometers (km) for satellite number 3.
equal to 7,000 kilometers
greater than 7,000 kilometers
less than 7,000 kilometers
Which term is an example of force?
energy
mass
weight
work
Instruments located around Earth record seismic wave activity during an earthquake. The epicenter of the earthquake and locations of the four instrument stations around the Earth are shown. Which stations will record fewer waves than the others?
Stations 1 and 4
Stations 2 and 3
Stations 3 and 4
Stations 1 and 2
Instruments located around Earth record seismic wave activity during an earthquake. The epicenter of the earthquake and locations of the four instrument stations around the Earth are shown. Select two statements that explain fewer waves recorded at some stations.
Part of the Earth's interior bent some of the waves.
Different materials in Earth reflect some of the waves.
Some waves are blocked by water on the Earth's surface.
Weather events near the stations can prevent waves from being recorded.
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Based on the information given what would be the allele relationship shown in this particular type of flowering bush?
Recessive
Complete Dominant
Co-Dominant
Incomplete Dominant
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Based on the information given what would the genotype for a white flower be?
Ww
ww
WW
Wr
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Based on the information given what would the genotype for a red flower be?
rr
RR
WR
Rw
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Based on the information given what would the genotype for a red and white flower be?
wr
Wr
WR
wR
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Which shows the correct number of cells containing the appropriate genetic information that would result from the process of mitosis for a bush with red and white flowers.
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Which shows the correct number of cells containing the appropriate genetic information that would result from the process of meosis for a bush with red and white flowers.
A farmer grows flowering bushes. The bushes have red, white, or red and white flowers. Choose the answer that shows the correct percentages of offspring phenotypes for a cross between a red flowering bush and a red and white flowering bush.
25% red, 25% white, and 50% red and white
0% red, 0% white, 100% red and white
50% red, 0% white, 50% red and white
50% red, 50% white, 0% red and white
As magma rises from the mid-ocean ridge, it cools and solidifies. As this magma solidifies, some of the minerals align with Earth's magnetic field. Every few million years, Earth's magnetic field reverses. This reversal is recorded in the magma that solidified after leaving the mid-ocean ridge. In the picture, these magnetic reversals are indicated by dark and light bands. How can scientists tell when the reversals of the magnetic field occurred?
by measuring the thickness of the different bands of the oceanic crust
by measuring the distance between the mid-ocean ridge and the ocean floor band
by measuring the amount of minerals that aligned to Earth's magnetic field in the different bands
by measuring the strength of Earth's magnetic field recorded in the solidified magma of oceanic crust
The diagram represents a convection current in the Earth's mantle. Descriptions of the events at each of the positions are shown. Which answer has the descriptions match to the correct numbers?
1- cooling of warmer material
2- movement of denser material
3- heating of cooler material
4- movement of less dense material
1-heating of cooler material
2-movement of less dense material
3-cooling of warmer material
4-movement of denser material
1-movement of denser material
2-cooling of warmer material
3-movement of less dense material
4-heating of cooler material
1-movement of less dense material
2-heating of cooler material
3-movement of denser material
4-cooling of warmer material
An environmental change occurs, causing a change in the color of snails present in an ecosystem. The graph shows the color distribution in a snail population at two different times. Select the four possible explanations for the results shown in the graph.
Snails with the lighter coloration moved into another ecosystem to survive.
Snails with darker coloration left the ecosystem.
Predators could more easily catch lighter-colored snails.
The lighter-colored snails had few offspring to pass the trait along.
The darker coloration was an existing trait in the original population.
Horizontal forces act on two boxes, initially at rest, as shown. The magnitude and direction of horizontal forces are also shown. What happens to box X and box Y as a result of the forces?
Box X starts moving, speeding up, Box Y remains at rest.
Box X starts moving at a constant speed, and Box Y remains at rest.
Box X starts moving at a constant speed, and Box Y starts moving, speeding up.
Box X starts moving, speeding up, Box Y starts moving at a constant speed.
Two positively charged particles are attached to springs. A metal sphere is placed near each charged particle, as shown in the diagram. Positive charge is slowly added to sphere A. An equal amount of negative charge is slowly added to sphere B. Assume the two systems are isolated from each other. How does the elastic potential energy change for each of the springs?
The elastic potential energy of both springs will increase.
The elastic potential energy of both spring will decrease.
The elastic potential energy of the spring in set-up A will decrease and the elastic potential energy of the spring in setup B will increase.
The elastic potential energy of the spring in set-up A will increase and the elastic potential energy of the spring in setup B will decrease.
