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C
lntroduction to Chemistry
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There is a lot more to a good experiment than
just test tubes and chemicals-consider how these
"unknown" factors may influence the results.
1 In
5
Pure substance that cannot be broken down into
simpler substances by a chemical reaction.
3
Describes how close a measured value is to an
actual or known value.
6
Working rnodel to explain and predict the
structure or properties of matter and nature,
based on the results of repeated observations and
experiments.
4
Substance
8
A standard reference experiment done under
parallel or identical conditions by omitting the
independent variabld whose effect is being tested"
11 Transforrnation of a pure substance that results in
a change in its composition, e.g., combustion or
corrosion {2 words}.
13 The reproducibility of measurements,
14 Either an element or a compound-its
composition cannot be varied by physical
means i2 words).
15 Quantitative observation of the size, extent or
amount of an object.
16 Although this way of studying natural pheno,
mena is often presented as a series of steps, it is
science, it's not really a rule so much as an
accepted summary of observed properties or
behavior in nature (2 words).
with a variable composition that can
be altered by simple physicat means, such as by
evaporating one of the components.
5
Controlled test or procedure carried out to learn
more atrout the physical or natural world.
7 No report of an experiment
is complete without
an understanding of the sources of experimental
_, which may be random or systematic.
9
Pure substance that can be broken do.wn into
simpler substances by a chemical reaction.
10 Water
is a common method for deterrnining
the density
-_ of an irregulariy shaped object or
material.
12 This law states that matter is neither created nor
destroyed in a chemical reaction (3 words!.
18 Ratio of mass to volume-a characteristic physical
property of a substance.
actually a process, of discovery {Z words}.
17 Qualitative description of the properties of a
rnaterial, such as its coior or appearance, usrrally
made with the senses.
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2O Anything that has mass and occupies space:
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a measurernent to
express the uncertainty in the measured quantity
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(2 words|.
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observation, experience or logical reasoning.
21 The digits that are reported for
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19 This prediction should never be compared to a
wild guess-it should be based on some prior
chemistry really does
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Characleristic of a substance, such as its solubility, conductivity, melting point, etc. (Z words).
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Chemistry Crossword
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uzzles
Introduction to Chemistry
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