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8th Grade Science Jam 1

Total questions: 40

Worksheet time: 39mins

Name
Class
Date
1.

In a reaction A + B ---> C,  reactant A is 5g and product C is 9g. How many grams of reactant B should be present? 

a)

4g

b)

5g

c)

9g

d)

14g

2.

The number to the lower right side of an element is known as what? 

a)

Subscript

b)

Superscript

c)

Coefficient

d)

Charge

3.

Matter can not be created nor destroyed, it can only be

a)

destroyed a little bit

b)

invisible

c)

transformed, changed

d)

none of the above

4.

Which is chemical equation is balanced?

a)

CH₄ + O₂ --> CO₂ + 2H₂O

b)

H₂ + O₂ --> 2H₂O₄

c)

4Al + 3O₂ --> 2Al₂O₃

5.

Which of the following is a sign that a chemical reaction has occurred?

a)

change in shape

b)

melting

c)

formation of a gas

d)

change of state

6.
Is bleaching your hair a physical or chemical change?
a)
physical
b)
chemical
7.

A vertical column of the periodic table is called...

a)

group

b)

tower

c)

period

d)

crew

8.
What is the chemical symbol for Lithium?
a)
H
b)
He
c)
Li
d)
N
9.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
10.

Evidence found in sedimentary rocks best supports which idea?

a)

Most organisms from Earth's history still exist.

b)

Organisms have not changed significantly over time.

c)

All organisms from Earth's history have become extinct.

d)

Organisms have evolved from simple to complex forms.

11.
Which is the best predictor of the relative age of a layer of rock?
a)
thickness of the layer
b)
position of the layer
c)
length of the layer
d)
size of the layer
12.
A geologist found 600-year-old sediments below a particular rock layer. Which will the geologist most likely find above the rock layer?
a)
450-year-old sediments
b)
600-year-old sediments
c)
650-year-old sediments
d)
1,000-year-old sediments
13.
How do scientists know that some mountains were once at the bottom of an ocean?
a)
freshwater rivers flow to the ocean.
b)
saltwater fish are found in some mountain streams.
c)
dinosaur bones have been discovered in the mountains.
d)
marine fossils have been found on the peaks of some mountains.
14.
Which best describes how ice cores are important to the study of geologic history?
a)
they show unconformities, which signal changes in deposition.
b)
they hold index fossils, which are used to date the different ice cores.
c)
they contain evidence showing changes in the atmospheric composition over time.
d)
they follow the Law of Superposition, which gives reasons for extinctions of species.
15.

Which is a process that allows scientists to compare rock layers with others in a sequence to determine their age?

a)

radiometric dating

b)

absolute dating

c)

relative dating

d)

speed dating

16.

What role do faults play in the Law of Superposition?

a)

faults create new types of rocks.

b)

faults are younger than the layers they cut through.

c)

faults are the same age as the layers they cut through.

d)

faults are older than the layers they cut through.

17.

Why are index fossils used as guides to determine the age of rocks?

a)

each index fossil lived during a specific geologic time period.

b)

all index fossils lived during all the periods of geologic time.

c)

index fossils are very rare and not commonly found in rocks.

d)

index fossils are found in igneous rocks.

18.

Which era is the most recent?

a)

Cenozoic

b)

Paleozoic

c)

Precambrian

d)

Mesozoic

19.
Which is used in radioactive dating?
a)
carbon-14
b)
index fossils
c)
hydrochloric acid 
d)
law of superposition
20.
A strawberry farmer finds that, after a hard freeze, some of his strawberries are still alive. Which best explains why these strawberries were able to survive?
a)
They have larger leaves to protect the fruit than the other strawberries.
b)
They have different genetic variations that cause them to be more resistant to cold temperatures.
c)
They are able to reproduce more quickly than the other strawberries.
d)
The color of the strawberries is darker, and they maintain their temperature better than other strawberries.
21.

Which could be considered the driving force of evolution?

a)

mutation

b)

cloning

c)

cancer

d)

biotechnology

22.

Which statement is true?

a)

All animals can adapt easily to any change in their environment.

b)

Even identical twins and clones do not have the same DNA sequence.

c)

All organisms that have survival success pass their genes on to their offspring.

d)

Individual organisms with certain favorable traits are more likely than others to survive and have offspring.

23.

Which best explains why the birds evolved with differently shaped beaks?

a)

They interbred with each other.

b)

Some birds had defective gene pools.

c)

All of the birds ate the same type of food.

d)

Over time they adapted to eating different types of food.

24.

Which characteristic of a population would most affect its survival when threatened by global climate change?

a)

biochemical adaptation

b)

genetic specialization

c)

genetic diversity

d)

size of the habitat

25.
Which would indicate that a series of fossils represent the evolution of the horse?
a)
All of the fossils were found in the same layers of rocks as horse fossils.
b)
All of the fossils are completely identical to horse bones.
c)
All of the fossils show similar structures to that of the modern horse.
d)
All of the fossils were located in the same place on Earth as horses.
26.

Which is an example of the forelimbs of humans and bats having the same basic skeletal structure but derived from the same evolutionary origin?

a)

cellular structures

b)

analogous structures

c)

homologous structures

d)

living structures

27.

Which best explains why the wing of a bat and the fin of a whale are similar?

a)

a mutation in nature that caused them to be similar

b)

a common ancestor between the bat and the whale

c)

a simple coincidence between the bat and the whale

d)

both use echolocation

28.
Which best demonstrates analogous structures in animals?
a)
cat fur and dog fur
b)
whale fins and human arms
c)
bird wings and insect wings
d)
gills in fish and lungs in mammals
29.
Which best explains the separate evolution of African and Asian elephants?
a)
overhunting
b)
volcanic activity
c)
splitting of Pangaea
d)
extinction of dinosaurs
30.

Which of the following is a non renewable resource?

a)

water

b)

wind

c)

coal

d)

biomass

31.

What is the original source of energy on earth?

a)

The sun

b)

Mars

c)

Wind

d)

Water

32.

Why do we often use non-renewable resources instead of renewable resources?

a)

Less expensive

b)

Higher carbon footprint

c)

More pollution

d)

All of the above

33.
Hydroelectric power produces electricity using.....
a)
Wind
b)
Sunlight
c)
Moving water
d)
Dung
34.
Fossil fuels are classified as nonrenewable because they.......
a)
require expensive equipment
b)
take millions of years to replace
c)
can be found all over 
d)
provide all the energy we use
35.
What are two advantages of geothermal energy?
a)
cheap and a lot pollution
b)
expensive and a lot of pollution
c)
cheap and little pollution
d)
expensive and little pollution
36.
Wind, geothermal, and solar energy are all what type of energy resources?
a)
cheap
b)
potential
c)
renewable
d)
chemical 
37.
Fossil fuels are considered nonrenewable resources because of - 
a)
Where they come from
b)
How they are produced 
c)
How useful they are 
d)
How long they take to form 
38.

Which of the methods of generating electricity does NOT use a renewable energy resource?

a)

Burning coal in a power plant

b)

Turbines spinning in dam

c)

Solar panels taking in light energy

d)

Drilling wells to reach hot rocks deep inside the earth

39.

Based on the data collected, which source of renewable energy is most efficient?

a)

Coal

b)

Wind

c)

Natural gas

d)

Solar

40.

Which chemical compound is found in an ice core sample?

a)

Carbon Dioxide

b)

Nitrogen Dioxide

c)

Carbon Monoxide

d)

No compounds are found in ice cores

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