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INTRO INTO CHEMISTRY HMS MIDTERM QUESTIONS WITH ACCURATE ANSWERS
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INTRO INTO CHEMISTRY HMS MIDTERM QUESTIONS WITH ACCURATE ANSWERS
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INTRO INTO CHEMISTRY HMS MIDTERM QUESTIONSWITH ACCURATE ANSWERS
Which of the following statements about elements is true?
Zinc, copper, and iron are elements.
An element is composed of two or more different substances. Over 150
elements in the universe
All known elements are naturally occurring. Accurate Answer - Zinc,
copper, and iron are elements.
Table salt, NaCl, is an example of which type of material?
element
mixture
colloid
compound Accurate Answer - compound
Based on the law of conservation of mass, which of these is a true statement?
Matter is neither lost nor gained during a chemical change.
The mass of the products is always greater than the mass of the materials
which react in a chemical change.
A certain mass of material must be present for a reaction to occur.
The mass of the products is always less than the mass of the materials which
react in a chemical change. Accurate Answer - Matter is neither lost nor
gained during a chemical change.
Which of these describes a chemical change?
A glass rod placed in a flame becomes hot.
When liquid water is heated, it changes to a gas.
Gasoline burns in an engine to form carbon dioxide and water.
, When a piece of rocksalt is hit with a hammer,it forms smaller crystals.
Accurate Answer - Gasoline burns in an engine to form carbon dioxide and
water.
Which of these is a homogeneous mixture?
sand on a beach
milk
sodium chloride
apple juice Accurate Answer - milk
Muddy water is an example of a
suspension.
colloid.
solution.
element. Accurate Answer - suspension
Which of these is not a physical property of a substance?
melting point
color
flammability
mass Accurate Answer - flammability
In which state of matter would you expect to find water, at 108°C and 1 atm
on Earth?
plasma
liquid
solid
gas Accurate Answer - gas
Which of these is likely to have matter in a plasma state?
microwave oven
incandescent light
steam
lightning Accurate Answer - lighting
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