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8th grade Science EOG Review

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Last updated almost 8 years ago
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Question 1
1.

_______can only be separated by a chemical reaction.

Question 2
2.

_______can only be separated by a chemical reaction.

Question 3
3.

_______can only be separated by a chemical reaction.

Question 4
4.

Steel is a metal that is made from iron and carbon. During the steel making process, iron & carbon are melted together, and the allowed to harden into a solid. The iron and the carbon DO NOT chemically react with each other. After the steel was made, 20 samples were taken from one piece and tested. Each sample contained 98% iron and 2% carbon.Which of the following terms BEST describes steel?

Question 5
5.

After a chemical reaction occurs in an open test tube, measurements indicate that the mass of the reactants is greater than the mass of the products remaining in the test tube. What most likely explains the measurements?

Question 6
6.

Describes the number of protons and neutrons in the nucleus of an atom.

Question 7
7.

What does the formula 6H2O2 mean?

Question 8
8.

When magnesium (Mg) metal is burned in the presence of oxygen (O), magnesium oxide is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide (MgO) is a(n)

Question 9
9.

Which pair of these geological activities are caused by movement of continental plates? 1.soil erosion 2.delta formation 3.chain of volcanoes 4.mountain formation

Question 10
10.

Scientists use radioactive dating to....

Question 11
11.

Fossils provide evidence for all of the following EXCEPT for....

Question 12
12.

Beneficial (helpful)____________ can lead to natural selection and a new organism.

Question 13
13.

The convergence of two continental plates would produce…

Question 14
14.

The _____________Era is when creation took place and life began.

Question 15
15.

Fossils are usually found in what type of rock?

Question 16
16.

What process is most responsible for the extinction of most species of plants and animals that have lived on Earth?

Question 17
17.

Which would least likely have an impact on global climate changes? Why?

Question 18
18.

Fossils left by ancient mammal species show that they had many of the same physical characteristics. What conclusion is supported by this evidence?

Question 19
19.

Some resources used to produce energy are considered non-renewable. Once they are used up, people will have to find other ways to make energy. Why will people have to find other energy resources rather than renewing the resources we already use?

Question 20
20.

Earth has limited resources from which to draw energy. Some resources cannot be easily renewed once they are depleted, or used up. Which energy resource can be used freely because it cannot be depleted?

Question 21
21.

Hydroelectric dams create nearly 20% of the world's electricity. They are also the cheapest way to create electricity. Once the dam is in place, there is limited cost to maintaining it and the source of the energy is renewable. What is one negative consequence of using dams to produce electricity?

Question 22
22.

Nuclear power plants can provide a large amount of energy to the communities they serve. What is one of the consequences of using nuclear power plants?

Question 23
23.

If we continue to use fossil fuels at the current rate of consumption, they will eventually run out. Which is not a way to prevent the depletion of our fossil fuel resources?

Question 24
24.

Which of the following would be classified as a renewable resource?

Question 25
25.

Which of the following is a property of a nonrenewable resource?

Question 26
26.

Which of the following energy sources would have the least ecological impact when used in the production of electricity?

Question 27
27.

Which would most likely cause a reduction in the amount of coal and natural gas on Earth?

Question 28
28.

Which is the best example of a pure substance?

Question 29
29.

Which statement best explains how periods on the periodic table are organized?

Question 30
30.

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

Question 31
31.

Which pair of elements has the most similar properties?

Question 32
32.

A scientist finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?

Question 33
33.

Which best describes how ice cores are important to the study of geologic history?

Question 34
34.

What do transitional fossils best support?

Question 35
35.

Scientists find dinosaur fossils in the bottom rock layers of a cliff and mammal fossils in the middle rock layer of the cliff. Which could best be concluded from this evidence?

Question 36
36.

Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?

Question 37
37.

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Question 38
38.

Which statement best describes the Law of Superposition?

Question 39
39.

Which would indicate that a series of fossils represent the evolution of the horse?

Question 40
40.

Which is a problem with using wind turbines to produce energy?

Question 41
41.

What characteristic of aluminum allows it to be made into aluminum foil?

Question 42
42.

Which best explains how geologic time scales can help scientists study the evolution of life on Earth?

Question 43
43.

The theory of global warming is based on an increase of what atmospheric gas?

Question 44
44.

Process of determining the age of certain archeological artifacts of a biological origin (such as bone, cloth, wood and plant fibers) up to about 50,000 years old.

Question 45
45.

Collision between two of Earth's tectonic plates, where one plate sinks underneath the other plate

Question 46
46.

Body part in different species that is similar in function but not in structure.

Question 47
47.

Phase of matter in which atoms can collide and move past (flow) one another freely.

Question 48
48.

Describes the number of protons in the nucleus of an atom

Question 49
49.

Arrangement of elements according to their properties

Question 50
50.

Can be recognized only when substances undergo a change in composition.

Question 51
51.

Matter isn't created or destroyed during a chemical reaction; the atoms are just rearranged by chemical changes.

Question 52
52.

Finding a way to use a resource (or product from a resource) again without changing it or reprocessing it.

Question 53
53.

Organic material, which can be recycled and converted to energy; includes crops, crop wastes, trees, wood waste and animal waste.

Question 54
54.

Anything that takes up space; all things all made of

Question 55
55.

The theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history.

Question 56
56.

Darwin's theory that the Earth's species have changed and diversified through time under the influence of natural selection.

Question 57
57.

Mixture that is not the uniform (same) throughout; parts can be visibly seen.

Question 58
58.

Resources that are extracted and used at a much faster rate than in which they were formed.