Online Study Guide
Instructions
1) You
do not need to type in your name in the space in the top-left area above. The results of this study
guide will not be sent to your teacher.
2) Carefully read each question and all the answer
choices.
3) Select the correct letter from the drop-down feature to the left of each
question.
4) When you are finished, click the “Check Your Work” button in the
bottom-left corner of the page.
5) The software will grade your work, and then it will show
you the results. Note that the correct answer will be displayed beneath the questions.
6)
Keep doing the study guide over until you earn a 100 on it.
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1.
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While camping out, Bobby toasted a marshmallow over
a campfire (see picture below).
Which is these is NOT evidence that chemical change has
occurred?
a. | The marshmallow gave off an
odor. | b. | The interior of the marshmallow
melted. | c. | The outside of the marshmallow turned
black. |
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2.
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A strip of magnesium burns at a temperature of about 2220°C. Burning
magnesium produces a brilliant white light and leaves behind a white powder known as magnesium oxide.
Which BEST
explains why the burning of magnesium is a chemical reaction? a. | The appearance of the magnesium strip
changed. | b. | The state of matter of the magnesium strip
changed. | c. | A new substance is formed. |
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3.
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During chemical reactions specific events occur at
the valence electron level of the atoms being combined resulting in a new substance being formed.
One of these events is when two or more substances combine and form new...?
a. | physical shapes | b. | electrons | c. | chemical bonds |
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4.
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Alyssa had a double-scoop vanilla ice cream cone on
a hot summer day. The heat melted the ice cream faster than she could eat it all, and some of it ran
down onto her hand.
Hot Sunny
Day | Double-scoop Ice Cream Cone | | | | |
Was her ice cream melting a chemical change? Explain
a. | Yes. There was heat involved, therefore this must be a
chemical reaction. | b. | No. When new
atomic bonds are formed, it is not a chemical change. | c. | No. Changes of state from solid to liquid (melting) are physical
changes. |
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5.
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A student observes that a gas is formed when
chemical Y is added to chemical Z in the lab.
The student’s observation of a new product
being formed is the common outcome of all...?
a. | chemical changes. | c. | mass
changes. | b. | phase changes. |
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6.
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Chemical changes occur during chemical
reactions.
Which of these is common to ALL chemical reactions.
a. | particles are rearranged and a new substance is
produced | b. | a change of color occurs and new types of elements are
formed | c. | heat is released into the air and their is a flash of
light |
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7.
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Some chemicals were combined together in a beaker
and a chemical reaction occurred.
Which of the following is a characteristic of ALL chemical
changes?
a. | Some form of light is given
off. | b. | Some mass is converted to
energy. | c. | A new material is
formed. |
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8.
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A chemical reaction occurs after substances from
two test tubes are combined in a flask..
A change in ________ confirms that a
chemical reaction has occurred.
a. | the kinds of atoms involved | b. | the amount of mass and energy of the substances | c. | the properties and identities of the reacting
substances |
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9.
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Physical changes can be fairly easily reversed, but
chemical change are very difficult to reversed.
Which of these occurs during ALL chemical
changes?
a. | new elements are formed | b. | atomic bonds are broken and new bonds are formed | c. | changes in states of matter from solid to liquid to gas are
observed |
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10.
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The equation below
represents hydrogen and oxygen combining to form water.
2H2 +
O2è
2H2O + energy
Which statement BEST explains how this reaction is similar
to all chemical reactions?
a. | The product has different
properties from the reactants. | b. | The product is in a different state than the
reactants. | c. | Energy is released in the form of massive
explosion. |
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