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Unit 3 Review-2017
Test Description: Chemistry and Physics topics
Instructions: Answer all questions to get your test result.
1) What happens to the properties of elements when they become compounds?
A
Elements reacted chemically to form a compound with the same properties
B
Elements reacted chemically to form an element with different properties
C
Elements reacted chemically to form an element with t he same properties
D
Elements reacted chemically to form a compound with different properties
2) What is a sign that a chemical reaction occurred?
A
An increase in the number of atoms
B
Formation of bubbles
C
Disappearance in atoms
D
A reduction in total mass
3) When baking soda and vinegar are mixed together in a sealed container, why doesn't the mass change?
A
Number of atoms did not change
B
Volume increased
C
Temperature increased
D
Distance between molecules stayed the same
4) The gases hydrogen and oxygen chemically combine to form a liquid. Describe their properties.
A
The compound water has only the properties of hydrogen
B
The compound water has only the properties of oxygen
C
A compound has identical properties to the properties that made it
D
A compound has different properties to the properties that made it
5) Which is an example of a chemical change?
A
Mixing sugar and water
B
Cutting paper
C
Crushing ice
D
Burning paper
6) If there are 10 grams of Ag(silver) and 20 grams of O(oxygen), what will be the mass of silver oxide?
A
40 grams
B
10 grams
C
30 grams
D
20 grams
7) Which is formed when 2 or more different elements combine chemically?
A
atom
B
molecule
C
mixture
D
compound
8) Which of the following equations is balanced?
A
2Na + O2-----2Na2O
B
Na + O2--------2Na2O
C
Na + O2------Na2O
D
4Na + O2------2Na2O
9) Which statement is true about Conservation of Mass?
A
Matter is made of particles too small to see
B
Air is made of particles but has no mass
C
Elements combine to form compounds
D
Matter can never be created or destroyed
10) Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of ?
A
an electron
B
a compound
C
a mixture
D
an atom
11) If 2 teams are competing in a tug of war and nobody is winning, the forces are
A
changed by gravity
B
balanced
C
unbalanced
D
accelerating
12) Glass 1 is on a shelf 4 ft. high, and glass 2 is on a shelf 8 ft. high. What can you say about their potential energy?
A
Glass 2 has twice the potential energy since it is only half as high
B
Glass 1 has twice the potential energy since it is twice as high
C
Glass 1 has twice the potential energy since it is only half as high
D
Glass 2 has twice the potential energy since it is twice as high
13) A grocery cart being pushed by a shopper will continue moving in the same direction at the same speed unless
A
the force of gravity and inertia react
B
the shopper adds more mass
C
it is acted on by an unbalanced force
D
all of the above
14) What is the difference between balanced and unbalanced forces?
A
There is no difference. They both cause motion.
B
Gravity is both balanced and unbalanced
C
Balanced forces cause motion
D
Unbalanced forces cause motion
15) Which statement best explains what happened when a chemical reaction occurred forming salt from sodium and chlorine?
A
The reaction made new elements from the atoms
B
The reaction destroyed elements to produce the products
C
The reaction rearranged the atoms in the reactants to form new substances
D
The atoms in salt were replaced with new atoms
16) Two different substances were combined in a bag that then became cool and deflated. Why?
A
The substances physically changed and became warm
B
The substances physically changed the plastic.
C
The substances chemically reacted and released thermal energy
D
The substances chemically reacted and absorbed thermal energy
17) What happens to the gravitational force of planets the further they get from the sun?
A
The gravitational attraction does not change
B
The gravitational attraction decreases
C
There is no relationship between a planet's distance from the sun and its gravitational force.
D
The gravitational attraction increases
18) Which of the following would make the strongest electromagnet?
A
1 battery and 20 coils of wire
B
2 batteries and 20 coils of wire
C
2 batteries and 2 coils of wire
D
1 battery and 2 coils of wire
19) Which of the following best explains why a balloon flies in the opposite direction when you release the air?
A
For every action there is an equal and opposite reaction
B
An object in motion stays in motion unless acted on by an unbalanced force
C
A force is caused by the sliding motion of 2 surfaces touching each other
D
The larger the mass of an object, the greater the force needed to move it
20) Which of the following would cause a larger force reading on a spring scale?
A
using a circular piece of wood
B
using a 20 gram mass
C
using a 10 gram mass
D
pulling it 60 cm
*select an answer for all questions
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