Suppose a vodka martini contains 30% alcohol with the remaining portion of the
drink composed of water. What is the solute in this type of martini?
~ alcohol
You need to prepare 2.00 L of 0.100 M Na2CO3 solution. The best procedure is
to weigh out:
~ 21.2 g Na2CO3 and add water until the f...
✓~ a model that explains the underlying reasons for observations and laws
What term best describes a brief statement that summarizes many past
observations and predicts new ones?
✓~ scientific law
Which of the following is an example of a scientific law?
✓~ In a chemical reaction, matter is neither created nor destroyed.
Which of the following would be considered a theory?
✓~ Helium balloons float because helium is less dense than air.
The key to success in chemistry is:
,✓~ all of the above
A plastic block has dimensions of 2.2 cm x 3.0 cm x 1.5 cm and a mass of 12.4
grams. Will the block float in water and why?
✓~ No, because the density of the block is 1.3 g/mL which is greater than the
density of water.
Given the density of Au is 19.3 g/cm3, determine the mass of gold (in grams) in
an ingot with the dimensions of 10.0 in x 4.00 in x 3.00 in.
✓~ 3.80 x 104
The distance between the two hydrogen atoms in a molecule of water is
0.000000000172 m. Express this distance in scientific notation.
✓~ 1.72 x 10-10 m
How many grams are in 1.48 x 107 μg?
✓~ 14.8
The correct decimal representation of 6.453 x 103 is:
, ✓~ 6,453
How many significant digits should be reported in the answer to the following
question?
(4.3-3.7) x 12.3=
✓~ 1
The correct scientific notation for the number 0.00050210 is:
✓~ 5.0210 x 10-4
Which measurement below represents the heaviest mass?
✓~ 1 Mg
Determine the answer to the following equation with correct number of
significant figures:
2.02+8.102-0.0297=
✓~ 10.09
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