Quiz about Science Grade 8

Question 1

Which diagram below represents a pure substance?

Accepted Answer

Question 2

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

Accepted Answer

Question 3

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?

Accepted Answer

D. It is a heterogeneous mixture.

Answer

A. It is an element.

Answer

B. It is a compound.

Answer

C. It is a homogeneous mixture.

Question 4

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?

Accepted Answer

C. homogenous mixture

Answer

A. element

Answer

B. compound

Answer

D. heterogeneous mixture

Question 5

Which of the following models best represents a mixture?

Accepted Answer

Question 6

The following is classfied as?

Accepted Answer

Homogenous Mixture

Answer

Heterogeneous Mixture

Answer

Compound

Answer

Element

Question 7

The following is classfied as?

Accepted Answer

Compound

Answer

Heterogeneous Mixture

Answer

Element

Answer

Homogenous Mixture

Question 8

The following is classfied as?

Accepted Answer

Element

Answer

Heterogeneous Mixture

Answer

Compound

Answer

Homogenous Mixture

Question 9

The following is classfied as?

Accepted Answer

Heterogeneous Mixture

Answer

Element

Answer

Compound

Answer

Homogenous Mixture

Question 10

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?

Accepted Answer

98g

Answer

62g

Answer

36g

Answer

100g

Question 11

A student creates a mixture of water and washing soda weighing 10 grams and a mixture of water and epson salt weighing 15 grams. He knows that when he mixes the two substances a chemical change will occur. According to the law of conservation of mass, what should the mass of the products weigh after he mixes them?

Accepted Answer

25 g

Answer

10 g

Answer

15 g

Answer

5 g

Question 12

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

E.

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

carbonate.

Question 13

The formula for glucose is C₆H₁₂O₆. How many elements does glucose contain?

Accepted Answer

3

Answer

1

Answer

24

Answer

432

Question 14

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.

Accepted Answer

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

Answer

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

Answer

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

Answer

D.

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

during the chemical reaction.

Question 15

The Law of Conservation of Mass states-

Accepted Answer

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

Answer

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

Answer

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

Answer

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.

Question 16

Silver Nitrate, AgNO₃, is a chemical compound used in photography. How many atoms of oxygen make up thischemical compound?

Accepted Answer

3

Answer

1

Answer

2

Answer

5

Question 17

Complete the sentence below.

The air friction acting on a baseball causes it to curve as it is pitched to the

catcher. This is a result of........

Accepted Answer

Newton's 1st law .

Answer

Newton's 2nd law .

Answer

Newton's 3rd law .

Question 18

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?

Accepted Answer

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

bat.

Answer

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

the person's hand.

Answer

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

beam pushes down on the ground.

Answer

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

push on the ground.

Question 19

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

D. The box will move to the right.

Question 20

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?

Accepted Answer

B. The car will accelerate four times as fast.

Answer

A. The truck will accelerate twice as fast.

Answer

C. The car will accelerate twice as fast.

Answer

D. The truck will accelerate four times as fast.

Question 21

A rocket booster initially applies 10,000N of force to a 1,000.0kg rocket causing it to accelerate at 10.0 m/s². Ten minutes later, the rocket booster is released and it falls through the atmosphere.

The mass of the rocket is now 760.0 kg and its acceleration is 7.0 m/s². Howmuch force is now being applied to the rocket?

Accepted Answer

B. 5,320 N

Answer

A. 532 N

Answer

C. 53,200 N

Answer

D. 50,320 N

Question 22

You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has stopped in front of it. Which illustration best demonstrates what would happen to the coffee cup?

Accepted Answer

Question 23

A group of four students are participating in a marble race. Each marble has a

different mass, and the same force is applied to each marble.

Which marble will experience the least acceleration?

Accepted Answer

D. Marble D

Answer

A. Marble A

Answer

B. Marble B

Answer

C. Marble C

Question 24

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?

Accepted Answer

C. How does the texture of a surface affect the amount of frictional force

applied to an object traveling across the surface?

Answer

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

Answer

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

to travel down a ramp?

Answer

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

travel down a ramp?

Question 25

The model displays the Earth at various positions in its orbit around the Sun. Each position also has a location labeled as W, X, Y, or Z. Using the model, identify which season each location would be experiencing. LOCATION W.

Accepted Answer

FALL

Answer

SUMMER

Answer

WINTER

Answer

SPRING

Question 26

The model displays the Earth at various positions in its orbit around the Sun. Each position also has a location labeled as W, X, Y, or Z. Using the model, identify which season each location would be experiencing. LOCATION X.

Accepted Answer

SUMMER

Answer

FALL

Answer

WINTER

Answer

SPRING

Question 27

The model displays the Earth at various positions in its orbit around the Sun. Each position also has a location labeled as W, X, Y, or Z. Using the model, identify which season each location would be experiencing. LOCATION Y.

Accepted Answer

SPRING

Answer

SUMMER

Answer

FALL

Answer

WINTER

Question 28

The model displays the Earth at various positions in its orbit around the Sun. Each position also has a location labeled as W, X, Y, or Z. Using the model, identify which season each location would be experiencing. LOCATION Z.

Accepted Answer

WINTER

Answer

SUMMER

Answer

FALL

Answer

SPRING

Question 29

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

seasons.

Question 30

A Hertzsprung-Russell diagram displays the temperature and luminosity of various stars in the universe. In which area of the HR diagram would the Sun be found?

Accepted Answer

AREA P

Answer

AREA M

Answer

AREA X

Answer

AREA Z

Question 31

Which statement describes the Sun?

Accepted Answer

A. The Sun is a main-sequence star.

Answer

B. The Sun is a giant star.

Answer

C. The Sun is a supergiant star.

Answer

D. The Sun is a white dwarf star.

Question 32

The Sun is the closest star to the Earth, but it is just one type of star in the Universe. There are many types of stars with various sizes and temperatures. The diagram represents stars that are in their main sequence. Where on the diagram would the sun most likely be found?

Accepted Answer

AREA C

Answer

AREA A

Answer

AREA B

Answer

AREA D

Question 33

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 34

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?

Accepted Answer

A. A flattened disk with spiral shaped ar

Answer

B. A rounded elliptical bulge

Answer

C. A random shape

Answer

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

Question 35

Our Sun is a medium-sized star in the Milky Way Galaxy. Which of these galaxies

has the same shape as our galaxy?

Accepted Answer

Question 36

The ______ theory seems to violate the Law of Conservation of Mass and Energy

Law.

Accepted Answer

A. Big Bang Universe

Answer

B. Oscillating Universe

Answer

C. Athropic Universe

Answer

D. Steady State Universe

Question 37

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 38

Three different stars have been labeled on the HR diagram displayed. When analyzing Stars X, Y, and Z, which star would have the greatest luminosity and lowest surface temperature?

Accepted Answer

STAR Z

Answer

STAR X

Answer

STAR Y

Question 39

Three different stars have been labeled on the HR diagram displayed. When analyzing Stars X, Y, and Z, which star would have the lowest luminosity and highest surface temperature?

Accepted Answer

STAR X

Answer

STAR Y

Answer

STAR Z

Question 40

The universe consists of many different objects including planets, moons,

galaxies, stars and nebulae. Which of the following statements accurately

describe nebulae?

Accepted Answer

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

Answer

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

Answer

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

Answer

D. Nebulae are all of space and everything that exists

Question 41

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?

Accepted Answer

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

Answer

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

planetary nebula.

Answer

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

cycle.

Answer

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

Question 42

Which city on the map just experienced a warm front pass trhough it?

Accepted Answer

Dallas

Answer

Denver

Answer

Seattle

Answer

Columbus

Question 43

Which city on the map just experienced a cold front pass trhough it?

Accepted Answer

Denver

Answer

Seattle

Answer

Columbus

Answer

Dallas

Question 44

On a weather map a stationary front is represented by what symbol?

Accepted Answer

Symbol 1

Answer

Symbol 2

Answer

Symbol 3

Answer

Symbol 4

Question 45

On a weather map a cold front is represented by what symbol?

Accepted Answer

Symbol 3

Answer

Symbol 1

Answer

Symbol 2

Answer

Symbol 4

Question 46

On a weather map a warm front is represented by what symbol?

Accepted Answer

Symbol 2

Answer

Symbol 1

Answer

Symbol 3

Answer

Symbol 4

Question 47

An air mass that is moving from the north pole to the equator would be turned ________ because of the spinning on the Earth's axis.

Accepted Answer

to the West

Answer

to the East

Answer

back toward the North

Answer

to the nearest body of water

Question 48

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 49

El Nino refers to a period of time when water in the Pacific Ocean is warmer than usual. What is the most likely effect on the weather of the Pacific Coast of Mexico during El Nino event?

Accepted Answer

a increase in precipation

Answer

a decrease n precipation

Answer

cooler temperatures

Answer

fewer hurricanes

Question 50

Where do hurricanes typically form?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 51

Which of the following statements best describes the role of oceans in the formation of hurricanes?

Accepted Answer

theWarm, moist air above warm, tropical ocean waters provide the energy that powers storms.

Answer

Warm air masses over equatorial regions rise more quickly than air masses over polar regions.

Answer

Cool air masses over polar are more dense than air masses over equatorial regions.

Answer

Cool, dry air above cool, tropical ocean waters provides the energy that powers storm systems.

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