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STAAR SCIENCE 8TH REVIEW

Total questions: 50

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

a)
b)
c)
d)
2.
a)

Particle W

b)

Particle X

c)

Particle Y

d)

Particle Z

3.

A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?

a)

Is the material malleable or ductile?

b)

Does the material feel hard to the touch?

c)

Will the material float in water?

d)

Does the material feel rough or smooth?

4.
a)

4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

b)

7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

c)

7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

d)

6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

5.

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

a)

the water in the cake batter evaporates

b)

the cake rises as gas bubbles form in the baking cake

c)

the cake takes the shape of the container in which it is baked

d)

the water in the cake batter is used to keep the cake moist as it bakes

6.
a)

the mother moves forward, and the daughter moves backward with a greater acceleration

b)

both move forward, but the mother moves with greater acceleration

c)

the mother moves backward, and the daughter moves forward with a greater acceleration

d)

both move backward, but the daughter moves with a greater acceleration

7.

The diagrams show forces acting on a toy car as it moves to the right. Which diagram shows the toy car that will most likely accelerate to the right based on these conditions?

a)
b)
c)
d)
8.

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

a)

there are no forces acting on the rock

b)

the only force acting on the rock is directed toward the sidewalk

c)

the forces acting on the rock are all balanced

d)

the sidewalk exerts an unbalanced force on the rock

9.

A pitcher throws a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10 newton force to the ball. Which statement correctly describes the reaction force between the bat and the ball?

a)

the reaction force is the force that causes the ball to move toward the bat

b)

the reaction force is the force applied to the bat by the player holding the bat

c)

the reaction force is the force that pulls the ball toward the ground

d)

the reaction force is the force of the ball on the bat

10.
a)
b)
c)
d)
11.

a)

moving at a constant speed

b)

accelerating

c)

moving toward the north

d)

stopped

12.

A student viewed the moon through binoculars one week after a new moon. Which image shows the phase of the moon that the student observed?

a)
b)
c)
d)
13.
a)

Diagram 1

b)

Diagram 2

c)

Diagram 3

d)

Diagram 4

14.

a)

the magnetic attraction between Earth and the sun

b)

potential energy stored in Earth that originated in the sun

c)

the gravitational attraction between the sun and the Earth

d)

electromagnetic energy from the sun pulling on Earth

15.

a)

the proposed law will protect the lake because plant roots between the wetland and the lake will stop pollution from entering th elake

b)

the proposed law ill not protect the lake because animals that live in or near the lake will add pollution to the lake

c)

the proposed law will not protect the lake because groundwater will carry pollution from the weland directly into the lake

d)

the proposed law will protect the lake because the high elevation of the water table will block pollution from entering the lake

16.

a)

bright sun with no wind

b)

partly cloudy with no wind

c)

mostly sunny with light winds

d)

overcast skies with strong winds

17.

A tiger cub has a pattern of stripes on its fur that is similar to that of its parents. Where are the instructions stored that provide information for a tiger's fur pattern?

a)

in cytoplasm inside cells

b)

on genes within chromosomes

c)

on the cell membrane

d)

in the mitochondria

18.

What are the main functions of the human skeletal system?

a)

to support the body, protect the organs, produce blood cells, and store calcium

b)

to regulate the composition of bodily fluids by removing metabolic wastes and retaining a balance of water, salt, and other nutrients

c)

to regulate and maintain bodily functions by producing hormones and releasing them into the bloodstream

d)

to enable the diffusion of oxygen into the bloodstream and the removal of carbon dioxide from the bloodstream

19.
a)
b)
c)
d)
20.

Researchers are studying lichens growing on trees in a forest ecosystem. At the beginning of the study, the researchers identified twelve lichen species in the forest. Later, a forest fire happened in the study area. The researchers returned to the area and found only six lichen species. Which inference is best supported from the researcher's observations?

a)

most lichen species are unaffected by forest fire

b)

the biodiversity in a forest increases after a fire

c)

certain lichen species are better adapted to survive forest fires than others

d)

forest fires will permanently remove certain species from the ecosystem

21.
Which is an electron?
a)
A
b)
B
c)
C
22.
What is found in the nucleus of atoms?
a)
Protons and electrons.
b)
Protons, neutrons, and electrons.
c)
Protons and neutrons.
d)
Neutrons and electrons.
23.
How many valence electrons does Sodium (Na) have?
a)
1
b)
2
c)
3
d)
4
24.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
25.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
26.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
27.
 Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
28.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
29.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
30.
A dichotomous key for insects is given. To what order does an insect with two pairs of scaly wings belong?
a)
Coleoptera
b)
Heteroptera
c)
Diptera
d)
Lepidoptera
31.
a body system that controls growth and homeostasis by secreting hormones from glands.
a)
skeletal system
b)
nervous system
c)
endocrine sytem
d)
integumentary system
32.
Which kingdom has all multicellular organisms that move to catch their food?
a)
Protist
b)
Fungi
c)
Plant
d)
Animal
33.
<--------8N  4N-------->
a)
2N
b)
12N
c)
4N
d)
32N
34.
Which of Newton's laws is illustrated when a magician pulls a tablecloth out from under the dishes without disturbing them?
a)
first
b)
second
c)
third 
d)
fourth
35.
Organisms that make their own food. Also called autotrophs.
a)
Producer
b)
Parasite
c)
Scavenger
d)
Decomposer
36.
a)
40,000 N
b)
100 N
c)
100 m/s^2
d)
10,000 kg
37.
a)
The cart was stationary with a velocity of 0 m/s for the entire 7 seconds. 
b)
The cart was stationary except for a short burst of acceleration of 0.5 m/s^2 . 
c)
The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds.
d)
The cart accelerated at a constant rate of approximately 0.8 m/s^2 . 
38.
a)
The book, the ball, and the car 
b)
The ball, the car, and the bird 
c)
The can, the swing, and the bird 
d)
The book, the ball, the can, and the swing 
39.
a)
As the fuel burns, gases push against the rocket, moving it upward. 
b)
As the fuel burns, gases move out of the rocket and reduce air resistance. 
c)
As the fuel burns, the mass of the rocket decreases. 
d)
As the fuel burns, the rocket moves faster. 
40.
a)
Airplane W has a greater kinetic energy than Airplane X. 
b)
The two airplanes have the same gravitational potential energy but different kinetic energies. 
c)
Airplane X has more gravitational potential energy than Airplane W. 
d)
The two airplanes have the same kinetic energy but different gravitational potential energies.
41.
a)
0.2 m/s 
b)
0.5 m/s
c)
5.0 m/s 
d)
10.0 m/s 
42.
A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred? 
a)
The chemical energy stored in the match changed to thermal energy and light energy. 
b)
The thermal energy stored in the match changed to light energy and chemical energy. 
c)
The light energy and thermal energy stored in the match changed to mechanical energy. 
d)
The light energy and thermal energy stored in the match changed to chemical energy. 
43.
a)
The Pacific and Nazca plates are both moving to the east. 
b)
The Pacific and Nazca plates are both moving to the west. 
c)
The Pacific plate is moving to the west, and the Nazca plate is moving to the east. 
d)
The Pacific plate is moving to the east, and the Nazca plate is moving to the west. 
44.
a)
The activities prevent most of the water from evaporating into the atmosphere. 
b)
Pollutants from the activities percolate through the soil and enter the water table. 
c)
The activities replace the groundwater used. 
d)
All of the above 
45.
a)
Position 1, because North America receives the most direct sun 
b)
Position 2, because North America is tilted toward the sun 
c)
 Position 3, because North America is parallel to the sun
d)
Position 4, because North America is tilted away from the sun 
46.
a)
February 5, March 7, April 5, May 4 
b)
February 15, March 17, April 15, May 14 
c)
February 25, March 27, April 25, May 24 
d)
February 29, March 31, April 29, May 28 
47.
Use this model of the Hertzsprung-Russell diagram to answer question. 
An astronomer discovers a new star that is very hot, but not very bright. What type of star did she discover? 
a)
a red giant
b)
a young star on the main sequence 
c)
an old star on the main sequence 
d)
a white dwarf 
48.
In the plant cell below, which arrow is pointed to the organelle that contains the genetic material for inherited traits? 
a)
Structure A 
b)
Structure B 
c)
Structure C 
d)
Structure E 
49.
As the Earth rotates, the part of the Earth facing the sun has ________.
a)
an axis
b)
darkness (night)
c)
daylight
d)
winter
50.
The illustration provided shows four locations in or near the Milky Way Galaxy. Which of the labeled locations shows the approximate position of the Sun?
a)
W
b)
X
c)
Y
d)
Z

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