The chemical formula for sodium carbonate, also known as washing soda, is Na2CO3. Which of the following statements are true concerning sodium carbonate's chemical formula?

D. There are 6 total atoms in the chemical formula for sodium carbonate.

A. There are 5 total atoms in the chemical formula for sodium carbonate.

B. There are 3 carbon (C) atoms and 2 sodium (Na) atoms in the chemical formula for sodium carbonate.

E. There are more carbon (C) atoms than there are sodium (Na) atoms in the chemical formula for sodium carbonate.

Drew added yeast and sugar to lukewarm water and placed it in a flask. He stretched a balloon over the opening the flask. After several minutes, he noticed small bubbles rising along the side of the flask as the balloon slowly began to inflate. How should the mass of the balloon/flask complex after the reaction relate to the mass of balloon/flask complex before the reaction.

A. The mass should be the same since matter is neither created nor destroyed.

B. The mass of the flask/balloon complex after the reaction would weigh more since something new was create

C. The mass of the flask/balloon complex after the reaction should be less since a gas was create

D. The mass of the flask/balloon complex after the reaction should be less because the reactants are used during the chemical reaction.

The Law of Conservation of Mass states-

C. That the mass in chemical reactions can not be created nor destroyed, just rearranged.

A. That in order to conserve mass we should always recycle our waste.

B. That conservation efforts are the only way to preserve the mass that exists in natural habitats.

D. That you should use only the minimum amount of chemicals necessary in a chemical reaction in order to conserve your supply of that chemical.

In 1687, Isaac Newton published a book discussing the three laws of motion that he had discovered. The third law of motion is known as the law of action-reaction. Which of the following situations are examples of Newton's third law of motion?

B. A baseball bat pushes on a ball while the ball pushes back on the baseball bat.

A. A person pushes on the water with a paddle while the paddle pushes back on the person's hand.

C. A gymnast pushes down on a balance beam with her feet and the balance beam pushes down on the ground.

D. A skateboarder pushes on the skateboard while the wheels of the skateboard push on the ground.

Jonas and his family are moving to another part of the city. As Jonas, his brother, and his Dad were driving one of the trucks filled with furniture to their new hom the truck ran out of gas. A gas station is 0.5 miles down the road. The three of them decide they need to somehow get the truck to the gas station to get gas. Jonas tries pushing the truck, but can not make it move. Which of the following would NOT be a solution to help get the truck to the gas station?

C. Jonas’ brother gets out of the cab of the truck and sits in the back of the truck with the furniture. With less mass, they should be able to push the truck to the gas station.

Unload the furniture out of the truck. With less mass, they should be able to push the truck to the gas station.

B. Jonas and his brother push the truck. With more force, they should be able to push the truck to the gas station.

D. Unload half the furniture out of the truck and let Jonas and his brother push. With less mass and more force, they should be able to push the truck to the gas station.

Joe pushes a box with a force of 16 N to the left. Ann pushes the same box from the opposite side with a force of 10 N to the right. What will be the result?

C. The box will move to the left because of a net force of 6 N.

A. The box will move up because of a combined force of 26 N.

B. The box will not move because 6 N is not enough to move it.

D. The box will move to the right.

The picture above illustrates the horizontal forces acting on a car. The car’s engine force pushes forward, while friction between the tires and the road, along with wind resistance drag at the car in the backwards direction. Which of the following must be true about these forces if the car is driving forward on a level road at a constant speed of 45 miles per hour?

B. The force of the engine forward must be greater than the combined forces of friction backward.

A. The force of the engine forward must be greater than the force of gravity acting on the car.

C. The force of the engine forward must be less than the combined forces of friction backward.

The force of the engine forward must be equal to the combined resistance forces.

A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of them. Which statement below best describes the acceleration of the vehicles?

B. The car will accelerate four times as fast.

A. The truck will accelerate twice as fast.

C. The car will accelerate twice as fast.

D. The truck will accelerate four times as fast.

Students roll a 6.5 g toy car down a 75 cm ramp covered with different textures. The students conduct three trials for each texture. The students use the table below to record their data. Which of the following questions is most likely being investigated based on the description?

C. How does the texture of a surface affect the amount of frictional force applied to an object traveling across the surface?

A. How long does it take for a toy car to travel down a ramp?

B. How does the length of a ramp affect the amount of time it takes for a toy car to travel down a ramp?

D. How does the mass of a car affect the amount of time it takes a toy car to travel down a ramp?

The diagram represents the positions of the Earth and the Sun throughout one year demonstrating the seasons. Which statements are accurate about the Earth, Sun, and seasons?

B. Point B represents North America in spring and South America in the fall.

A. Point A represents South America in summer and North America in winter.

C. The Earth revolves around the Sun in 24 hours and has a 23.5-degree tilt.

D. The Earth rotates over a period of 365 days and experiences four separate seasons.

The gravitational impact of the moon and the sun can be seen when observing the Earth’s tides. The diagram shows a snapshot of where the high tides can occur due to the moon's alignment with the Earth at that moment. Why are the tides more affected by the moon’s gravitational pull than the sun’s?

B.The moon is closer to the Earth, giving it a stronger gravitational pull on the Earth.

A. The moon is larger than the sun, giving it a stronger gravitational pull on the Earth.

C. The sun’s gravitational pull is spread evenly among all planets in the solar system, but the moon’s gravity only affects the Earth.

D. The rock that composes the moon creates a special gravitational pull that affects the liquids found on the Earth.

Which statement describes the Sun?

A. The Sun is a main-sequence star.

C. The Sun is a supergiant star.

D. The Sun is a white dwarf star.

In what way is the life cycle of stars a cycle?

C. Super novas redistribute dust and gas which eventually form nebulae.

A. The number of stars in the universe is constant.

B. All types of stars follow a predictable pattern of change.

D. Black holes cause the compression of matter which, in time, forms new stars.

Our Sun, sometimes referred to by astronomers as the star Sol, is located in a galaxy of stars called the Milky Way. Which of these traits commonly characterizes the Milky Way?

A. A flattened disk with spiral shaped ar

D. We do not know the shape of the Milky Way.

In approximately 5 billion years, the Sun will start to die. As it starts to die, the Sun will expand, becoming much larger. The diagram shows the predicted changes in the habitable zone of the Sun as it changes. Why will the Earth no longer be in the habitable zone of the Sun?

C. The four inner planets will become too hot to support life.

A. Gravity will become stronger and water will become too heavy.

B. The tides will become too large for organisms to survive.

D. The Sun's gravity will move Saturn's rings into the Earth's orbit.

The universe consists of many different objects including planets, moons, galaxies, stars and nebulae. Which of the following statements accurately describe nebulae?

C. Nebulae have more mass than a solar system but less mass than galaxies.

A. Nebulae consist of one star orbited by many planets.

B. Nebulae have more mass than galaxies but less mass than stars.

D. Nebulae are all of space and everything that exists

Looking up at the night sky we see thousands of stars that started their life journey hundreds of years ago. A star's life cycle is determined by its characteristics. Which statements correctly describe the stars throughout their life cycle?

A. A star's life cycle begins with a nebula.

B. As a supergiant continues throughout its life cycle, it will experience a planetary nebula.

C. A white dwarf is a small sized star that does not go through change in its life cycle.

D. All star's life cycles will end with a black hole or neutron star.

Two students are studying aa map of the United States that shows July temperatures averaged over a ten-year period. One notices that cities on the East Coast have warmer temperatures than cities at similar lattitudes on the West Coast. Which of the following is resposbile for the difference?

Ocean currents from the tropical Atlantic warm the East Coast, while currents from the Northen Pacific cool the West Coast.

El Nino brings rain and cool weather to the West Coast but does not affect the East Coast as much.

The Pacific Ocean is larger and deeper than the Atalantic Ocean, therefore cooler than the Atlantic.

During the summer, the East Coast is often hit by hurricanes, which brings warm ari as they move along the coast.

Where do hurricanes typically form?

in oceans near the equator because the water stays relatively warm.

In ocean currents further away from the equator because the water stays relatively cool.

In oceans near the equator because the water stays relatively cool.

in oceans further away from the equator because the water stays relatively warm.

Science Grade 8

Authored by Erick Castillo

Science

8th Grade

NGSS covered

Used 9+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which diagram below represents a pure substance?

Which of the following diagrams correctly represents the organization of matter by composition?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Students are given a solid sample and asked to determine whether the sample is an element, compound, or mixture. One student observes that the sample is made up of particles of different colors, sizes, and shapes. When the students break off a piece of the sample, they notice that some particles are softer than others and some shine while others appear dull. What can the students conclude about their sample?

A. It is an element.

B. It is a compound.

C. It is a homogeneous mixture.

D. It is a heterogeneous mixture.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Samples of the air we breathe that were taken from different parts of the world have all been found to contain about 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases. Based on this analysis, which is the correct classification for air?

A. element

B. compound

C. homogenous mixture

D. heterogeneous mixture

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following models best represents a mixture?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following is classfied as?

Heterogeneous Mixture

Compound

Element

Homogenous Mixture

The following is classfied as?

Heterogeneous Mixture

Element

Compound

Homogenous Mixture

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Which diagram below represents a pure substance?

Which of the following diagrams correctly represents the organization of matter by composition?

Samples of the air we breathe that were taken from different parts of the world have all been found to contain about 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases. Based on this analysis, which is the correct classification for air?

Which of the following models best represents a mixture?

The following is classfied as?

The following is classfied as?

The following is classfied as?

The following is classfied as?

A chemical equation for the reaction calcium hydroxide, Ca(OH)2 and sulfuric acid H2SO4 is shown. The masses of the reactants and products are given in grams. How many grams of sulfuric acid were used in the reaction?

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A chemical equation for the reaction calcium hydroxide, Ca(OH)₂ and sulfuric acid H₂SO₄ is shown. The masses of the reactants and products are given in grams. How many grams of sulfuric acid were used in the reaction?