8th grade benchmark
a year ago
bounmarie
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  • Question 1
    30 seconds
    Q.

    An atom of calcium-48 and an atom of calcium-47 differ in

    answer choices

    atomic number.

    nuclear charge.

    number of neutrons.

    number of electrons.

  • Question 2
    30 seconds
    Q.

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    You are hired as a scrap metal dealer. A customer wants to sell you a piece of precious scrap metal. You know it is one of these common metals. You slowly heat the metal and it melts at 962 °C. You also take the density of the metal and find it to be roughly 10.5 g/cm3. What is the MOST LIKELY identity of the metal?

    answer choices

    Copper

    Gold

    Silver

    Zinc

  • Question 3
    30 seconds
    Q.

    One difference between mixtures and pure substances is that

    answer choices

    mixtures can be physically separated.

    mixtures are made of one type of atom.

    pure substances have no chemical bonds.

    pure substances can be physically separated.

  • Question 4
    30 seconds
    Q.

    In physical science lab, Ben and Jerry added small pieces of magnesium to hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared. What is a sign that a chemical reaction has taken place in this experiment?

    answer choices

    odor

    gas is produced

    magnesium disappeared

    decrease in temperature

  • Question 5
    30 seconds
    Q.

    It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Look at that! Chemical and physical changes taking places on your birthday cake!"


    How would you respond to Roger?

    answer choices

    Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.

    Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.

    Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.

    Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.

  • Question 6
    30 seconds
    Q.

    The table shows the density and volume of four liquid samples. The four liquids do not mix with each other. What is the order in which the layers will be formed, from top to bottom, if the four liquids are poured into a beaker and allowed to settle?

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    answer choices

    Sample A; Sample B; Sample C; Sample D

    Sample C; Sample A; Sample D; Sample B

    Sample D; Sample C; Sample B; Sample A

    Sample B; Sample D; Sample A; Sample C

  • Question 7
    30 seconds
    Q.

    If water with the mass of 15.0 grams is heated into water vapor in a closed system such as a closed glass jar, what is the mass of the gas after the water completely vaporizes?

    answer choices

    13.5 grams

    15.0 grams

    16.5 grams

    The mass cannot be determined without knowing the volume.

  • Question 8
    30 seconds
    Q.

    A __________ has distinct properties and composition that never vary.

    answer choices

    solution

    molecule

    pure substance

    heterogeneous mixture

  • Question 9
    30 seconds
    Q.

    I. O2 is chemically bonded together.


    II. O2 is divisible.


    III. Oxygen is a nonmetal.


    IV. The natural state of oxygen is as a diatomic gas.


    Which conclusion can be drawn from these statements about O2?

    answer choices

    O2 is an atom.

    O2 is a molecule.

    O2 is an electron.

    O2 is an element.

  • Question 10
    30 seconds
    Q.

    When Kay added 30 g of hydrochloric acid (HCl) to 65 g of Zn, bubbles appeared and a white precipitate, zinc chloride (ZnCl2) was produced. She found that the mass of the zinc chloride was 63 g. Since the Law of Conservation of Matter stated that matter can't be created or destroyed, she was puzzled about the difference in mass. What is the best explanation for the missing 2 g?

    answer choices

    2 g of zinc disappeared.

    2 g of hydrogen gas were produced.

    Kay didn't correctly mass the precipitate.

    Kay didn't collect all of the precipitate.

  • Question 11
    30 seconds
    Q.

    Consider the phase change taking place in the picture. You could use ALL BUT ONE statement to describe what is happening here. That is:

    answer choices

    Temperature is increasing.

    Kinetic energy is increasing.

    The space between the particles remains the same.

    The attractive force between the particles is decreasing.

  • Question 12
    30 seconds
    Q.

    A certain substance is a solid at 15°C. Sarah heated a sample of the solid substance in a beaker using a Bunsen burner during science class. She and her partner recorded the temperature at one-minute intervals. Their data is recorded in the table below. Based on the girls' data, when was the kinetic energy of the substance the greatest?

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    answer choices

    At 15oC.

    At 60oC.

    When they started the heating process.

    During the period when the substance remained at 54oC.

  • Question 13
    30 seconds
    Q.

    Muscles convert chemical energy into

    answer choices

    light energy.

    nuclear energy.

    mechanical energy.

    electromagnetic energy.

  • Question 14
    30 seconds
    Q.

    Two iron rods are placed horizontally, touching end-to-end. One end of one rod is heated. After some time, the other rod also feels warm to touch. How did the heat travel from the heated rod to the one that was not heated?

    answer choices

    The air over the heated rod traveled to the other rod and made it warm.

    Part of the heat was converted to radiation and traveled to the cooler rod.

    Electrons within the rods started moving, distributing heat consistently in both rods.

    The molecular movement in the first rod transferred energy to the molecules in the second.

  • Question 15
    30 seconds
    Q.

    Maria’s father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into

    answer choices

    electrical energy.

    mechanical motion.

    heat and light energy.

    electrical and heat energy.

  • Question 16
    30 seconds
    Q.

    Bruce left some butter out in his kitchen. Bright sunlight came in through the window and melted the butter. Heat energy from the sun is called

    answer choices

    conduction.

    convection.

    insulation.

    radiation.

  • Question 17
    30 seconds
    Q.

    Which point on the roller coaster's path represents the maximum potential energy?

    answer choices

    A

    B

    C

    D

  • Question 18
    30 seconds
    Q.

    A drawn bow possesses mechanical energy in the form of _______________. After the arrow is released, the energy is transformed into _________________.

    answer choices

    potential energy; mechanical energy

    elastic potential energy; kinetic energy

    gravitational potential energy; kinetic energy

    elastic kinetic energy; mechanical kinetic energy

  • Question 19
    30 seconds
    Q.

    A skateboarder heads down a smooth, steep course. What graph illustrates the change in kinetic and potential energy during this process?

    answer choices

    A

    B

    C

    D

  • Question 20
    30 seconds
    Q.

    In this scenario a battery is used to supply chemical potential energy. The potential energy is transformed and produces kinetic energy. The battery causes a fan to spin and that kinetic energy can also be described as mechanical energy. Check out the values for each: 100 J potential energy results in 75 J of kinetic energy. What conclusion can be drawn from the energy transformation diagram?

    answer choices

    The energy transformation results in 25J of energy being lost.

    Not all of the chemical potential energy is converted; 25J remains as potential energy.

    The 100J of chemical potential energy releases 25J as friction and 75J of mechanical energy.

    The chemical potential energy is transformed into 75J of kinetic energy and 25J of heat energy.

  • Question 21
    30 seconds
    Q.

    You are sitting in a car that isn't moving; suddenly, the car quickly accelerates. Your body seems to be pushed back against the seat. Which word best explains why your body seemed to be pushed backward against the seat?

    answer choices

    newton

    vector

    inertia

    gravity

  • Question 22
    30 seconds
    Q.

    How many accelerations (positive or negative) are shown in this graph?

    answer choices

    6

    4

    2

    1

  • Question 23
    30 seconds
    Q.

    Mutt and Jeff are running along a path each pushing a cart loaded with rocks. If Mutt's wagon has a mass two times greater than Jeff's and they want to stay together, arriving at their destination at the same time, what must happen?

    answer choices

    Jeff should slow down so Mutt can catch up.

    Mutt must use half as much force to push his cart.

    Mutt must use twice as much force to push his cart.

    Mutt and Jeff will use the same force, but Mutt will take bigger steps.

  • Question 24
    30 seconds
    Q.

    Your teacher was given an apple by a student trying to get on her good side. It sits on her desk the whole year, not moving.


    You know that, if the apple were to roll off the desk, it would fall to the ground. So what is keeping the apple motionless on the desk?

    answer choices

    Once placed on the desk, gravity is no longer acting on the apple.

    The downward force of gravity on the apple is balanced by a larger force on the apple by the desk.

    The downward force of gravity on the apple is balanced by an equal but opposite force on the apple by the desk.

    The downward force of gravity on the apple is balanced by an equal but opposite force on the apple by the teacher.

  • Question 25
    30 seconds
    Q.

    According to the diagram, the block should be moving in which direction?

    answer choices

    The block should not move at all.

    The block should move to the left.

    The block should move to the right.

    There is no way to tell which way the block should move.

  • Question 26
    30 seconds
    Q.

    Consider the car driving around a circular track. Once started, the driver maintains a speed of 45 m/h. Compare the driver's velocity with his acceleration in this case.

    answer choices

    The car is accelerating because it is changing direction but the velocity is constant.

    The car is traveling at a constant rate of speed so it is not accelerating and the velocity does not change.

    Acceleration is the change in velocity so the car is experiencing a change in velocity and it is accelerating.

    The car is traveling at a constant rate of speed so it is not accelerating but the velocity changes because the direction the car travels is constantly changing.

  • Question 27
    30 seconds
    Q.

    Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing?

    answer choices

    small size

    low energy

    high energy

    high velocity

  • Question 28
    30 seconds
    Q.

    AM Radio Waves

    Ultraviolet Light

    X Rays

    Visible Light


    What is true for ALL of the examples of electromagnetic waves?

    answer choices

    They all move at the same speed in a vacuum.

    They all have the same wavelength.

    They all have the same frequency.

    They all have the same energy.

  • Question 29
    30 seconds
    Q.

    When light enters a pair of glasses, it ______________ when it hits the glass.

    answer choices

    conducts

    diffracts

    reflects

    refracts

  • Question 30
    30 seconds
    Q.

    The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?

    answer choices

    The moon pulls more on the shuttle.

    The earth pulls more on the shuttle.

    Both are equal due to equal distances.

    Both are equal due to the mass of the shuttle.

  • Question 31
    30 seconds
    Q.

    You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to

    answer choices

    a piece of metal.

    positively charged hair.

    the neutrally charged wall.

    another negatively charged balloon.

  • Question 32
    30 seconds
    Q.

    Why does light refract when it encounters the glass in a lens?

    answer choices

    because it speeds up, which causes it to bend

    because it slows down, which causes it to bend

    because it hits a dense medium, which causes it to bounce off

    because it gets absorbed, which causes it to lessen in intensity

  • Question 33
    30 seconds
    Q.

    Mike wants to negatively charge a small rubber ball. Which of these methods would successfully charge the ball?

    answer choices

    heating the ball in boiling water

    running the ball over a strong magnet

    rubbing the ball back and forth on carpet

    dropping the ball from a tall bulding

  • Question 34
    30 seconds
    Q.

    Which choice BEST represents the sound waves from a soft low-pitched train rumble that suddenly shifts to a loud, high-pitched squeal of brakes?

    answer choices

    A

    B

    C

    D

  • Question 35
    30 seconds
    Q.

    Which diagram BEST represents the light waves of a bright red brake light on the left side to a dim violet night light on the right side?

    answer choices

    A

    B

    C

    D

  • Question 36
    30 seconds
    Q.

    This graph is accurate because

    answer choices

    mechanical waves cannot travel through a medium.

    electromagnetic waves cannot travel through a vacuum.

    electromagnetic waves move faster than mechanical waves.

    mechanical waves move faster than electromagnetic waves.

  • Question 37
    30 seconds
    Q.

    The wave pictured represents a sound wave. Which label along the wave represents a sound with the LOWEST intensity?

    answer choices

    A

    B

    C

    D

  • Question 38
    30 seconds
    Q.

    What happens when light strikes a translucent object?

    answer choices

    All of the light passes through the object.

    All of the light is reflected by the object.

    None of the light can pass through the object.

    Some of the light passes through, and some of the light is absorbed or scattered by the object.

  • Question 39
    30 seconds
    Q.

    How does a concave lens differ from a convex lens?

    answer choices

    A convex lens is another way to describe a plane mirror; a concave lens is curved.

    A concave lens us curved inward on both sides; a convex lens is curved on only one side.

    A convex lens has a thick center and thin edges; a concave lens has a thin center and thicker edges.

    A convex lens has a thin center and thick edges; a concave lens has a thick center and thiner edges.

  • Question 40
    30 seconds
    Q.

    Lucy tells her classmates that while she was at the lake, she realized that when she dove underwater, she couldn't hear anything. Lucy thinks this is because sound can not pass from the air into the water. Is she right?

    answer choices

    It depends on how deep Lucy dove.

    It depends on the volume of the sound.

    No, sound vibrations can pass from air to water.

    Yes, sound vibrations can not pass from air to water.

  • Question 41
    30 seconds
    Q.

    This picture shows a standard electric field created by a point charge.


    This electric field will influence

    answer choices

    objects with a positive charge.

    objects with a negative charge.

    any object with a mass greater than zero.

    both positively and negatively charged objects.

  • Question 42
    30 seconds
    Q.

    In a _____________ wave, vibrations are perpendicular to the direction of the wave motion. In a _____________ wave, vibrations are parallel to the direction of the wave motion.

    answer choices

    transverse, standing

    standing, transverse

    longitudinal, transverse

    transverse, longitudinal

  • Question 43
    30 seconds
    Q.

    __________ transmit signals that carry pictures, data, music and conversations invisibly over long distances and have been the basis for almost all non-written communication and most wireless technologies used by humans today.

    answer choices

    Microwaves

    Radio waves

    Seismic waves

    Infrared waves

  • Question 44
    30 seconds
    Q.

    Based on the table, what might be a reasonable conclusion?

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    answer choices

    Sound travels faster through more dense materials.

    The speed of sound depends only on the state of matter.

    Sound travels slower through metals than any other materials.

    Sound travels faster through aluminum than any other material that exists.

  • Question 45
    30 seconds
    Q.

    An electromagnet is created using a battery, an insulated copper wire and an iron nail. The wire is wrapped around the nail 20 times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet?

    answer choices

    Increase the voltage of the battery and decrease the number of turns of the coil.

    Decrease the voltage of the battery and decrease the number of turns of the coil.

    Increase the voltage of the battery and increase the number of turns of the coil.

    Decrease the voltage of the battery and increase the number of turns of the coil.

  • Question 46
    30 seconds
    Q.

    A student looks at ocean waves coming into the beach. An ocean wave with more energy will

    answer choices

    have a greater height.

    have a greater period.

    travel toward the beach faster.

    strike the beach with greater frequency.

  • Question 47
    30 seconds
    Q.

    The attracting and repelling forces of magnets are used in countless objects, from refrigerator doors to maglev trains. Refrigerator doors use the attraction of magnets to stay closed, while maglev trains use magnetic repulsion to hover above rails. The center magnet in the picture is hovering between two magnets, making it appear to float. Which best explains how the center magnet is able to hover between two other magnets?

    answer choices

    The opposite poles of each magnet are facing each other, so they repel.

    The magnets are stacked so that similar poles are facing one another.

    The middle magnet is repelling the top magnet while attracting the bottom.

    The middle magnet is attracted to the top magnet, but held down by gravity.

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