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8th Grade Fall Semester Exam

Total questions: 50

Worksheet time: 2hrs 49mins

Name
Class
Date
1.

What is the pH value of a neutral substance?

a)

0

b)

7

c)

14

d)

-7

2.

A solution with a pH value of 3 is considered ?

a)

Acidic

b)

Basic

c)

Neutral

d)

Salty

3.

The pH scale ranges from (a)   to 14.

4.

Bases are also known as (a)   .

5.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
6.
a)

A pure substance which is an Element

b)

A pure substance which is an Compound

c)
Mixture of compound and element
d)
Mixture of elements
7.
a)

A pure substance which is an Element

b)

A pure substance which is a Compound

c)
Mixture of compound and element
d)
Mixture of elements
8.
Mixtures are __________ combined.
a)
Chemically
b)
Physically
c)
Magically
d)
Spontaneously
9.
a substance that is formed as the result of a chemical reaction
a)
Product 
b)
Reactant
c)
Starters
d)
Enders
10.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
11.

In a heterogeneous mixture, the substances

a)

break down into new substances

b)

can be physically separated

c)

are chemically combined

d)

can only be separated through chemical processes

12.

A chemical change differs from a physical change because

a)

Chemicals are used

b)

Molecules do not physically touch

c)

A new substance is formed and in a physical no new substance is formed

d)

The change can be seen but in a physical change it cannot

13.

A substance produced during a chemical reaction

a)

Product

b)

Reactant

c)

Properties

14.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
15.
The tightness across the surface of water that enables paper clips to float is ____________.
a)
adhesion
b)
capillary action
c)
surface tension
d)
polarity
16.

Cohesive means ........

a)

the water molecules stick to each other

b)

the water molecules stick to other surfaces

c)

the water molecules are less dense

d)

the water molecules are far apart

17.

Adhesive means ........

a)

the water molecules stick to each other

b)

the water molecules stick to other surfaces

c)

the water molecules are less dense

d)

the water molecules are far apart

18.

What is the Law of Conservation of Mass?

a)

Mass is created in a chemical reaction

b)

Mass is created in a physical change

c)

New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

d)

Mass is never created or destroyed

19.

In reaction A +B --> C, reactants A + B have a total mass of 9g. What is the mass of product C?

a)

4g

b)

5g

c)

9g

d)

14g

20.

7 g of hydrogen reacts with 17 g of oxygen to produce ______ g of water

a)

14

b)

24

c)

38

d)

62

21.

How many sulfur atoms must be present in the products after a reaction between the following reactants: 2SO2 +2H2O22SO_2\ +2H_2O_2  

a)

2

b)

3

c)

4

d)

8

22.

How many Hydrogen atoms must be present in the products after a reaction between the following reactants: 2SO2 +2H2O22SO_2\ +2H_2O_2  

a)

2

b)

3

c)

4

d)

8

23.
Football A has a greater mass than football B.  Which football will have greater acceleration when both are thrown with the same force in the same direction?
a)
Football A
b)
Football B
c)
They will have the same acceleration
d)
Mass has no effect on acceleration
24.
What Unit do we Measure Force in? 
a)
Newtons
b)
Joules
c)
Force
d)
Don't know
25.
According to Newton's second law, if you increase the force applied to an object :
a)
it accelerates more
b)
it doesn't move
c)
you get more inertia
d)
it decelerates
26.
What is Newtons 2nd law of motion?
a)
Pancakes 
b)
Force= Mass multiplied by acceleration
c)
For every action there is a equal and opposite  re-action.
d)
Law of gravity 
27.

The length of one complete wave cycle is...

a)

frequency

b)

wave speed

c)

amplitude

d)

wavelength

28.

The greater the frequency, the ________ energy carried by the wave.

a)

more

b)

less

29.

Occur when the disturbance is at a right angle to the direction the wave is moving 

Ex: Heat and light waves

a)

Transverse wave

b)

Longitudinal wave

30.

Waves where the disturbance moves in the same direction as the wave.

Ex: Sound wave

a)

Transverse wave

b)

Longitudinal wave

31.

the distance from crest (top) to crest (top) or from trough (bottom) to trough (bottom)

a)

Amplitude

b)

Frequency

c)

Rarefaction

d)

Wavelength

32.

the length from rest to crest

a)

Amplitude

b)

Frequency

c)

Rarefaction

d)

Wavelength

33.

Select the correct order of waves on the EM Spectrum from low to high energy

a)

Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma

b)

Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio

c)

Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio

d)

Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma

34.

Which has the LONGEST wavelength and, therefore, the LOWEST frequency/energy

a)

Gamma Rays

b)

Ultraviolet

c)

Visible Light

d)

Infrared rays

35.

Wavelength and Frequency are related in that...

a)

they are always the same

b)

when one increases, the other decreases (inversely proportional)

c)

there is no correlation

d)

they both vary in an irregular pattern

36.

Electromagnetic waves can transfer energy without a(n)

a)

medium.

b)

electric field.

c)

magnetic field.

d)

change in either a magnetic or an electric field.

37.

Which has the LONGEST wavelength and, therefore, the LOWEST frequency/energy

a)

Gamma Rays

b)

Ultraviolet

c)

Visible Light

d)

Infrared rays

38.
The higher the frequency the ______ the energy. 
a)
higher
b)
lower
c)
neither, stays the same
39.
This is an image of the formation of a star, also known as a .... 
a)
Main Sequence
b)
Planetary Nebula
c)
Supernova
d)
Stellar Nebula
40.

True or False: All stars will eventually become a black hole

a)

True

b)

False

41.
Which of the following is NOT a final stage of a star. 
a)
black hole
b)
black dwarf
c)
neutron star
d)
red giant
42.
This stage is when a high mass star explodes
a)
Supergiant
b)
Red giant
c)
Supernova
d)
Black hole
43.
When a star's gravitational pull is so strong that not even light can escape, it's called a what?
a)
Black hole
b)
Supernova
c)
White dwarf
d)
Nebula
44.

What is the sun made up of?

a)

Hydrogen

b)

Helium

c)

Hydrogen and Helium

d)

None of the Above

45.

Our sun is known as a middle-aged, stable star. Also known as a ____________________.

a)

Gas Giant

b)

Nebula

c)

Pulsar

d)

Main Sequence Star

46.

What type of galaxy is the Milky Way?

a)

Spiral

b)

Elliptical

c)

Irregular

d)

Lenticular

47.

A galaxy that is shaped like a sphere, football, or egg is an example of a(n)

a)

Spiral Galaxy

b)

Elliptical Galaxy

c)

Irregular Galaxy

48.

Which type of galaxy is shown in the image?

a)

Spiral

b)

Elliptical

c)

Irregular

49.

Which type of galaxy is shown in the image?

a)

Spiral

b)

Elliptical

c)

Irregular

50.

Which type of galaxy is shown in the image?

a)

Spiral

b)

Irrational

c)

Irregular

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