Which chemical equation is balanced and reflects the Law of Conservation of Matter/Mass?

2MnO 2 + H 2 O => Mn 2 O 3 + 2OH

2Mn 4 O + H 2 O => Mn 2 O 3 + 2OH

A balloon is filled with water. The balloon is heated and begins to expand. The water inside begins to turn into steam. What will happen to the mass of the balloon?

The mass will increase since gases do not have mass.

The mass will increase since liquid will have more mass.

The mass will decrease since the liquid will take up less space.

Two people each hold the end of a rope and create waves by moving their arms up and down. This wave is best classified as a transverse wave because ___________

the wave is moving horizontally as the particles of the rope move up and down.

both the rope particles and the wave are moving in the same direction.

the wave is moving up and down as the particles of the rope move horizontally.

the wave is moving in a parallel direction with the motion of the person's arms.

Limiting contact between gamma rays and healthy tissue is important because

gamma rays are high energy and may cause damage to healthy cells.

gamma rays are low frequency and may disturb mitochondria.

gamma rays have long wavelengths and may heat up healthy cells.

there is no risk associated with exposure of healthy cells to gamma rays.

Compare the sounds produce by wave A and wave B. The human ear would hear

wave A as a louder sound than wave B.

wave A as a higher pitched sound than wave B.

wave A and B with the same pitch, but wave A as louder.

wave B has a louder and higher pitched sound than wave A.

Explain how the mass of a bowling ball that has been rolled down the lane affects the kinetic energy.

The kinetic energy is increasing proportional to the mass of the bowling ball.

The kinetic energy does not depend on the mass of the bowling ball.

The kinetic energy is decreasing proportional to the mass of the bowling ball.

The kinetic energy is increasing proportional to the square of the mass of the bowling ball.

How can we increase the potential energy of the car?

Strap a boulder to the car so that it weighs more.

Keep the length of the hill at 50 m but only 5 m tall.

Take the interior out of the car so that the car has less mass.

Keep the hill at 10 m tall but increase the length of the hill so that the car has farther to roll.

Based on the diagram of a roller coaster track, what statement is true?

A car at point B has more kinetic energy than the car at point D.

A car at point A has the most kinetic energy.

A car at point B has the most potential energy.

A car at point D has more kinetic energy than the car at point B.

A roller coaster at an amusement park goes from the top of a tall hill to the bottom. During this time, the roller coaster

loses potential energy and gains kinetic energy

gains both potential and kinetic energy

loses both potential and kinetic energy

loses kinetic energy and gains potential energy

In an automobile engine, fuel is burned to convert ________energy into heat energy. The ________energy is then changed into ________energy.

chemical → heat → mechanical

heat → chemical → mechanical

chemical → mechanical → heat

mechanical → heat → chemical

Which example shows electrical energy being transformed into heat energy?

a small toaster oven toasts a bagel

Which would be best categorized as heat transfer by conduction?

Feeling the heat from a light bulb with your hand when touching the bulb.

Wearing a white shirt to stay cool on a summer day.

Warming your body under the sun in summer

Feeling the heat from a light bulb while holding your hand from 6 inches away.

An astronaut travels to the moon. What is true regarding her mass and weight?

Her mass is the same on the moon and Earth, but her weight is greater on Earth.

Her mass and weight are greater on Earth.

Her mass and weight are the same on the moon as on Earth.

Her weight is the same on the moon and Earth, but her mass is greater on Earth.

Maglev trains, like the one shown in the picture, use magnet fields to travel up to 600 miles per hour. Magnets on the bottom of the train and on the tops of the rails have similar magnetic poles. Based on properties of magnets, how do these magnets affect the train?

The two magnetic fields repel each other, causing the train to levitate, or hover, above the rails.

The powerful magnets greatly reduce the force of gravity, resulting in less friction and greater speed.

The train is able to stop immediately because the magnets on the rails attract the magnets on the train.

Maglev trains have extremely powerful magnets, greatly decreasing the force of gravity and allowing them to float.

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

another negatively charged balloon

Looking at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way.

Touch the electroscope with any charged object.

Bring a positive and negative object near the top.

Bring a negative object near the top.

Bring a positive object near the top.

What could you do to increase the number of paper clips an electromagnet picks up?

increase the number of loops of wire around the nail

remove the nail from the center of the wire

spread the loops of wire apart on the nail so they do not touch

The basic concept of how a simple motor works is explained by which statement?

When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.

When a fan blows on a wire, it causes it to spin, creating a force.

When a fan blows on a wire, it causes it to spin, creating an electrical current.

When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.

Which car is accelerating?

a car that rounds a curve at a constant speed

a car that travels in straight line at a constant speed

a car that is set to a constant speed of 60 miles per hour

A graph here shows the displacement of two walkers over time. Walker 1 is graphed in red while walker 2 is graphed in blue. Which statement is supported by the information in the graph?

Walker 2 moved faster overall than walker 1 by the end.

Both walkers had the same speed overall.

Both walkers had reached the same distance at ten seconds.

Walker 1 moved faster overall than walker 2 by the end.

The image above shows two opposite forces acting on a rolling cart, what can we say is true about the effect of the forces on the cart?

The forces are unbalanced, and net force on the cart moves it to the left.

It cannot be determined without knowing which man is stronger.

The forces are balanced and the cart will not move.

The forces are unbalanced, and net force on the cart moves it to the right.

8th Science Practice GMAS

Authored by Ashley Quirk

Physics, Chemistry, Science

8th Grade

42 Questions

NGSS covered

Used 80+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

One difference between mixtures and pure substances is that

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A __________ has distinct properties and composition that never vary.

solution

molecule

pure substance

heterogeneous mixture

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Relate the temperature of a gas to the kinetic energy of its particles.

As the temperature extends, the kinetic energy of the particles decreases.

As the temperature increases, the kinetic energy of the particles increases.

As the temperature decreases, the kinetic energy of the particles increases.

As the temperature intensifies, the kinetic energy of the particles decreases.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When the sun heats up the surface of a puddle of water, the water

condenses

evaporates

infiltrataes

precipitates

Tags

NGSS.MS-PS1-4

NGSS.MS-ESS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Maggie recorded her observations of the baking soda used in lab today. Which observation indicated a chemical property of the baking soda?

odor

color

texture

bubbles

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Grace is given a piece of wood, an iron nail, and a styrofoam cup. She puts these objects into a bucket of water and observes that the nail sinks to the bottom, the wood floats just under the surface, and the cup floats on top of the water. What property is being demonstrated by this experiment.

density

melting point

solubility

temperature

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The images show two commonly observed changes.

Picture I shows a chemical change, because a new substance is formed.

Picture II shows a chemical change, because a new substance is formed.

Picture I shows a chemical change, because the same substance changes form.

Picture II shows a chemical change, because the same substance changes form.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-2

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8th Science Practice GMAS

One difference between mixtures and pure substances is that

A __________ has distinct properties and composition that never vary.

Relate the temperature of a gas to the kinetic energy of its particles.

When the sun heats up the surface of a puddle of water, the water

Maggie recorded her observations of the baking soda used in lab today. Which observation indicated a chemical property of the baking soda?

Grace is given a piece of wood, an iron nail, and a styrofoam cup. She puts these objects into a bucket of water and observes that the nail sinks to the bottom, the wood floats just under the surface, and the cup floats on top of the water. What property is being demonstrated by this experiment.

The images show two commonly observed changes.

Which of these is a physical property?

Helium, neon, and argon are examples of

Which element listed is the MOST reactive?

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