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Tori - 8th Grade Science > Semester 2 Exam > Flashcards

Semester 2 Exam Flashcards

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1
Q

Which of the following is an example of how science can solve social problems?

  1. It can stop excessive rain from occurring.
  2. It can identify the sources of polluted water.
  3. It can control the time and day when cyclones happen.
  4. It can reduce the frequency of severe weather conditions.
A
  1. It can identify the sources of polluted water.
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2
Q

The chemical equation shown represents photosynthesis.

Carbon dioxide + A + light –x—> B + oxygen.

A

It stores chemical energy for plants and animals.

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3
Q

Which of the following processes helps to cycle carbon between water and air? (5 points)

A

Diffusion

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4
Q

Which of the following is true about the amount of energy that is stored in plant cells during photosynthesis? (5 points)

  1. It forms from an equal amount of potential energy.
  2. It forms from an equal amount of radiant energy.
  3. It forms from a lower amount of potential energy.
  4. It forms from a lower amount of radiant energy.
A

2.It forms from an equal amount of radiant energy.

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5
Q

The balanced equation for photosynthesis is shown below.

6 CO2 + 6 H2O → C6H12O6 + 6 O2

Which statement best justifies the conservation of mass during photosynthesis?

  1. The total number of carbon atoms on both sides is 6.
  2. The total number of hydrogen atoms on both sides is 18.
  3. The number of oxygen atoms is equal to the number of carbon atoms on each side.
  4. The number of oxygen atoms is equal to the number of hydrogen atoms on each side.
A

The number of oxygen atoms is equal to the number of hydrogen atoms on each side.

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6
Q

Which of the following gases is formed during photosynthesis? (5 points)

A

Oxygen

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7
Q

During which of the following processes would carbon most likely be released? (5 points)

  1. Burning of coal
  2. Formation of natural gas
  3. Formation of shells
  4. Photosynthesis
A
  1. Burning of coal
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8
Q

What type of energy transformation takes place when carbon is cycled in a gasoline-based car? (5 points)

A

Chemical energy to mechanical energy

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9
Q

Which of the following is true about the glucose molecule during the process of cellular respiration? (5 points)

  1. It forms oxygen.
  2. It builds muscles.
  3. It forms mitochondria.
  4. It helps release energy
A
  1. It helps release energy
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10
Q

Which of the following is released during cellular respiration? (5 points)

A

Carbon dioxide

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11
Q

What type of energy transformation takes place during cellular respiration?

A

Oxygen and Glucose are turned into Carbon Dioxide, Water, and Energy. The amount of atoms that begins is the same amount that it ends with.

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12
Q

The table below shows the role of different substances during photosynthesis.

Substance Role During Photosynthesis
_________________________________________
Carbon dioxide Changes into oxygen in the presence of water, light, and chlorophyll
____________________________________________
Glucose Combines with carbon dioxide to form water
__________________________________________
Chlorophyll Traps sunlight

Which of the following statements would correct one of the roles listed in the table?

A

Glucose stores the chemical energy.

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13
Q

Which of the following processes is not a part of cellular respiration? (5 points)

  1. Simple sugars are formed.
  2. Energy and other products are released.
  3. Energy molecules transfer energy to cells.
  4. Oxygen combines with carbon of simple sugar.
A
  1. Simple sugars are formed.
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14
Q

The surface temperature of four stars is shown in the table below.

A- 3,600
B-6,000
C- 2,000
D- 15,000

If one of these stars happens to be blue, which star is most likely to be that color? (5 points)

A

D- 15,000

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15
Q

Which of the following astronomical bodies or collection of astronomical bodies is likely to be a part of the others listed? (5 points)

  1. Milky Way
  2. Solar system
  3. Sun
  4. Universe
A
  1. Sun
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16
Q

Which feature of the sun is a section that is cooler than its surroundings? (5 points)

A

Sunspot

17
Q

Which of the following terms describes the distance between the crests of successive waves? (5 points)

A

Wavelength

18
Q

The table below compares the distances of two astronomical bodies from Earth.

Sun- 149 Kilometers Away
A Star- 4.4 Light Years Away

Based on the table, which of the following statements is true? (5 points)

  1. A shuttle from Earth would take more time to reach the sun than to reach the star.
  2. A shuttle from Earth would take the same time to reach the sun and the star.
  3. Earth is farther away from the sun than from the star.
  4. Earth is closer to the sun than to the star

( 1 Light Year is 9.461 Kilometers)

A
  1. Earth is closer to the sun than to the star

1 Light Year is 9.461 Kilometers

19
Q

Which of the following measurements is used to compare the distance between objects in the solar system? (5 points)

  1. Distance between Earth and Saturn
  2. Distance between the sun and Earth
  3. Speed of rotation of Saturn
  4. Speed of rotation of Earth
A
  1. Distance between the sun and Earth
20
Q

The table below shows two types of electromagnetic waves and three random applications of electromagnetic waves.

X- Rays- 1. Show the heat released by astronomical objects
Ultra Violet Rays- 2. Study stars having high temperature
?- 3. Detect collection of gas, dust, and plasma

Which of these best matches the waves with their applications? (5 points)

A

X-rays—3 and ultraviolet rays—2

21
Q

An unlabeled hierarchical diagram of various astronomical bodies is shown below.
The labels A, B, C, and D can be used to represent the Milky Way, Earth, universe, sun, and solar system.
A being the largest, B the second, C the third, and D the smallest.

Part 1: Which four astronomical bodies would you choose to represent the four labels in the diagram?

Part 2: Which astronomical body, other than the ones given, could also represent the label D?

A
  1. I would label D- Earth, C- Sun, B- Solar System, A- Universe.
    ( From greatest to least in the hierarchy is would go Universe, Galaxy, Solar System, and then an object within the solar system, such as the sun or a planet)
  2. The moon could also represent D because it is smaller than both the sun and earth.
22
Q

Which of the following statements best explains how the photopolarimeter has made outer space exploration easier? (5 points)

  1. It measures the charged particles of solar winds.
  2. It sends cosmic rays to the sun and other planets.
  3. It can send data to Earth using high-frequency antenna.
  4. It is able to determine the properties and composition of planets.
A
  1. It is able to determine the properties and composition of planets.
23
Q

Which of the following is the closest estimate of the number of stars present in a galaxy? (5 points)

A

Several billion

24
Q

Part 1: Describe the mass and the surface temperature of the giant stars.

A
  1. Giant stars have a fairly low surface temperature, but because they are so big they appear brighter to earth. Giant stars have a low surface temperature but have a large mass.
25
Q

Part 2: Explain using complete sentences where on the HR diagram you would expect to find a giant star based on its physical properties. (10 points)

A
  1. On the HR diagram I would expect to find the giant star at 2 on the scale of absolute brightness, and the surface temperature of 5,000.
26
Q

Which of the following stars is likely to be the dimmest? (5 points)

  1. The hottest star
  2. The least massive star
  3. The star that is blue in color
  4. The star with the fastest fusion rate
A
  1. The least massive star
27
Q

Which of the following best describes an elliptical galaxy? (5 points)

  1. Interstellar dust and gases forming a smooth circular pattern
  2. Several billion stars arranged in a smooth flat manner
  3. A group of stars forming recognizable patterns in the night sky
  4. Millions of planets arranged in the shape of a disk with spiraling arms
A
  1. Several billion stars arranged in a smooth flat manner

Tori - 8th Grade Science (9 decks)

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