Chemistry Semester 1 Exam Questions With
Verified Answers
What is the measure of the amount of stuff (matter) in a sample of matter? - answer✔Mass
What is the measure of the amount of space taken up by a sample of stuff (matter)? -
answer✔Volume
Cubic centimeter (cm3) is a unit used to measure - answer✔Volume
Gram (g) is a unit used to measure - answer✔Mass
Grams for every one milliliter (mc005-1.jpg) or grams for every one cubic centimeter (mc005-
2.jpg) are typical units used for - answer✔Density
In a closed system, what property of stuff (matter) cannot change even though the appearance
may change? - answer✔Mass
Which statement below best describes the result of the experiment. - answer✔The mass
increased during the experiment.
Which statement below best describes the result of the experiment. - answer✔Some groups
lost mass due to careless lab technique.
Which statement below best describes the type of system measured in this experiment. -
answer✔The system is open, allowing particles of matter to enter or leave of the system
Select answer that best completes the following statement of the Law of Conservation of Mass:
- answer✔the mass of the system cannot change.
When making a scientific measurement, we show how closely we are able to make the measure
by reporting the correct number of significant figures. Which of the statements below best
describes what we mean in chemistry by the words "significant figures"? - answer✔All the
certain digits plus one estimated digit our measurement tool allows us to read
The length of the pencil reported with the correct number of significant figures is -
answer✔17.7
Determine the number of significant figures present in the correctly reported measurement
6.345 mL. - answer✔4 SF's
Determine the number of significant figures present in the correctly reported measurement
0.025 g - answer✔2 SF's
A student measures and correctly records the length and width of a rectangle as follows:
length = 10.00 cm
width = 26.50 cm
The calculated area (length x width) of the rectangle is recored with the correct number of
significant figures as - answer✔265.0 cm2
Compare 1 mg to 1 g. - answer✔1mg < 1g (one milligram is less than one gram)
How many nanoJoules (nJ) is equivalent to 0.000375 Joules (3.75 x 10-4 J). - answer✔3.75 x
10^5 nJ or 375,000 nJ
What is the slope of the line for Substance A? - answer✔slope = 80g/50mL = 1.6 g/mL
On the mass-volume graph, the slopes of the lines for the pure Substances A and B tell us what
physical property of the substances? - answer✔density = mass(g) / volume(mL )or the amount
of stuff (matter) for every unit of space taken up by the stuff
Which has the lowest density, pure Substance A or pure Substance B? - answer✔Substance B
has the lowest density.
Is the y-intercept for metal B negligible? Why? - answer✔Yes, because b/ y-max x 100% = 2.58g
/87g x 100% = 3.0% and 3.0% is less than 5%
A chemistry class produced the graph below when they plotted mass vs. volume for samples of
two substances. The equation of the mass-volume relationship for metal B is best represented
as - answer✔mass(g) = 8.53 g / cm3 x volume(cm3)
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