Unit 3 Review-2017 Question Preview (ID: 36363)
Chemistry And Physics Topics.
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What happens to the properties of elements when they become compounds?
a) Elements reacted chemically to form an element with t he same properties
b) Elements reacted chemically to form a compound with the same properties
c) Elements reacted chemically to form a compound with different properties
d) Elements reacted chemically to form an element with different properties
What is a sign that a chemical reaction occurred?
a) Formation of bubbles
b) A reduction in total mass
c) Disappearance in atoms
d) An increase in the number of atoms
When baking soda and vinegar are mixed together in a sealed container, why doesn't the mass change?
a) Temperature increased
b) Number of atoms did not change
c) Distance between molecules stayed the same
d) Volume increased
The gases hydrogen and oxygen chemically combine to form a liquid. Describe their properties.
a) A compound has identical properties to the properties that made it
b) The compound water has only the properties of oxygen
c) The compound water has only the properties of hydrogen
d) A compound has different properties to the properties that made it
Which is an example of a chemical change?
a) Crushing ice
b) Mixing sugar and water
c) Burning paper
d) Cutting paper
If there are 10 grams of Ag(silver) and 20 grams of O(oxygen), what will be the mass of silver oxide?
a) 10 grams
b) 20 grams
c) 30 grams
d) 40 grams
Which is formed when 2 or more different elements combine chemically?
a) atom
b) compound
c) molecule
d) mixture
Which of the following equations is balanced?
a) Na + O2------Na2O
b) 2Na + O2-----2Na2O
c) 4Na + O2------2Na2O
d) Na + O2--------2Na2O
Which statement is true about Conservation of Mass?
a) Matter can never be created or destroyed
b) Elements combine to form compounds
c) Air is made of particles but has no mass
d) Matter is made of particles too small to see
Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of ?
a) an atom
b) a compound
c) an electron
d) a mixture
If 2 teams are competing in a tug of war and nobody is winning, the forces are
a) accelerating
b) changed by gravity
c) unbalanced
d) balanced
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 1 has twice the potential energy since it is only half as high
b) Glass 2 has twice the potential energy since it is twice as high
c) Glass 1 has twice the potential energy since it is twice as high
d) Glass 2 has twice the potential energy since it is only half as high
A grocery cart being pushed by a shopper will continue moving in the same direction at the same speed unless
a) it is acted on by an unbalanced force
b) the shopper adds more mass
c) the force of gravity and inertia react
d) all of the above
What is the difference between balanced and unbalanced forces?
a) Balanced forces cause motion
b) Gravity is both balanced and unbalanced
c) There is no difference. They both cause motion.
d) Unbalanced forces cause motion
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 rearranged the atoms in the reactants to form new substances
c) The reaction destroyed elements to produce the products
d) The atoms in salt were replaced with new atoms
Two different substances were combined in a bag that then became cool and deflated. Why?
a) The substances physically changed the plastic.
b) The substances physically changed and became warm
c) The substances chemically reacted and released thermal energy
d) The substances chemically reacted and absorbed thermal energy
What happens to the gravitational force of planets the further they get from the sun?
a) The gravitational attraction increases
b) The gravitational attraction decreases
c) The gravitational attraction does not change
d) There is no relationship between a planet's distance from the sun and its gravitational force.
Which of the following would make the strongest electromagnet?
a) 1 battery and 2 coils of wire
b) 1 battery and 20 coils of wire
c) 2 batteries and 2 coils of wire
d) 2 batteries and 20 coils of wire
Which of the following best explains why a balloon flies in the opposite direction when you release the air?
a) An object in motion stays in motion unless acted on by an unbalanced force
b) A force is caused by the sliding motion of 2 surfaces touching each other
c) For every action there is an equal and opposite reaction
d) The larger the mass of an object, the greater the force needed to move it
Which of the following would cause a larger force reading on a spring scale?
a) pulling it 60 cm
b) using a 10 gram mass
c) using a 20 gram mass
d) using a circular piece of wood
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