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Unit 1 Review
Unit 1 Review
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1
The SI base unit for measuring mass is
kilogram
meter
gram
mole
2
Convert 1000 mL to Liters
10 L
0.100 L
100 L
1 L
3
How many grams are in 5.00 mols of Calcium
(Molar Mass of Copper = 40.078 g/mol)
?
8.02 g Ca
200. g Ca
0.125 g Ca
NO!
4
Perform the following conversion: 1.51 x 10
15
atoms
of Si to mol of Si
8.41 x 10-3 mols Si
3.67 x 109 mols Si
4.62 x 10-8 mols Si
2.51 x 10-9 mols Si
5
What is the dependent variable? "If acid rain is in water, then fish population will increase."
acid rain increasing
the fish population
the type of fish
acid in water
6
The definition of a chemical is
a toxic substance made in a laboratory.
any substance that has a definite composition.
an unnatural material added to foods.
anything that has mass and takes up space.
7
Which is NOT a Quantitiative Observation?
My dog has yellow fur
My dog has 42 teeth
My dog has 4 legs
My dog has 2 eyes
8
An actual measurement of a sample is 3.5m. The measured value is 2.5m. Percent error?
40.0 %
26.8 %
10.0 %
28.6 %
9
What is the control based on the hypothesis below? "If trees have leaves, then bird nests will increase."
leaves on the tree
type of birds
the type of tree
number of bird nests
10
The amount of space occupied by an object is
matter
mass
area
volume
11
What is chemistry?
the study of the composition, structure, & changes in matter
the difference between a chemical and physical property
matter, volume, and length
something that has mass and volume
12
Write the number seven thousand with six significant figures.
7000
700.
7.00x103
7000.00
13
How many significant figures in the measurement 7000 g?
0
3
1
4
14
Find the mass of a sample with a volume of 55.1 mL and a density of 6.72 g/mL.
370 g
370. g
0.122 g
8.20 g
15
Convert 23 465 mg to grams.
234.65 g
2.3465 g
23.465 g
0.23465 g
16
The closeness of a set of measurements made in the same way refers to
accuracy
precision
measurement
system
17
Theoretical Chemistry
The study of substances and processes in living things.
Use of math & computers to understand observed principles.
The identification of components & composition of materials.
Study of properties & changes of matter & relation to energy.
18
Psuedoscience is....
when people study fossils, bones, and prehistoric plants
Science based on the scientific method supported by empirical evidence.
Fake science that is based on opinions and personal beliefs.
The study of psuedonyms.
19
When rounding sig figs with addition/subtraction, what is the rule?
round to the greatest number of decimal places
round to the least number of decimal places
20
Physical Chemistry is ...
Use of math & computers to understand observed principles
The identification of components & composition of materials
The study of substances and processes in living things
Study of properties & changes of matter & relation to energy
21
The branch of chemistry that deals with substances containing carbon is called
Physical Chemistry
Organic Chemistry
Biochemistry
Analytical Chemistry
22
"The percent yield for 2 moles of HI = 77.3%," Is this an example of a qualitative or quantitative observation?
Quantitative observations
Qualitative observations
23
Convert 34.6 grams to kilograms
3460 kg
0.0346 kg
0.346 kg
346 kg
24
All measurements in science
must include only digits known with certainty.
must be expressed in scientific notation.
are both accurate and precise.
have some degree of uncertainty.
25
Which is an example of psuedoscience?
astronomy
geography
astrology
biology
26
The SI base unit for measuring length is
second
gram
meter
ampere
27
How many significant figures in the measurement 0.0020 m?
4
2
5
1
28
If a metal has a mass of 45.65g and a volume of 16.9 cm
3
, calculate its density.
2.7 g/cm3
0.370 g/cm3
2.70 g/cm3
0.37 g/cm3
29
Round seven thousand cm to two significant figures using scientific notation.
7000. cm
7x103 cm
7.0x103 cm
7000 cm
30
When rounding sig figs with multiplication/division, what is the rule?
round to the least number of sig figs present in the original problem
round to the greatest number of sig figs present in the original problem
31
The branch of chemistry in which the compositions of materials are identified is known as
Analytical Chemistry
Organic Chemistry
Physical Chemistry
Biochemistry
32
How many
atoms
are in one mole?
3.00 x 108 atoms
6.022x10-23 atoms
6.626 x 10-34 atoms
6.022x1023 atoms
33
What does percent error tell you?
how accurate your results are
how precise your results are
34
Which of the following measurements contains 3 significant figures?
0.02 mL
200 mL
200.0 mL
20.2 mL
35
What is the independent variable? "If plants are watered, then growth height will increase."
amount of sunlight
the type of plant
watering the plants
plant growth height
36
How many moles of potassium (K) are there in 88 grams of potassium
(Molar Mass of Potassium = 39.0983 g/mol)
?
2.2 mols K
This ain't math class
3440 mols K
0.44 mol K
37
Which is not a part of the scientific method?
making an educated guess
introducing bias
making measurements
analyzing data
38
The branch of chemistry that involves the study of living things is called
Biochemistry
Analytical Chemistry
Organic Chemistry
Theoretical Chemistry
39
How many significant figures in the measurement 10.0500 g?
3
7
4
6
40
53 cm+ 48.26 cm =
1.0x102 cm
101.26 cm
101 cm
101.3 cm
41
What is the correct conversion factor for converting from
atoms
of copper to moles of copper?
\frac{1mole}{6.022\times10^{23}atoms}
\frac{63.55g}{1mole}
\frac{6.022\times10^{23}atoms}{1mole}
\frac{63.55g}{6.022\times10^{23}atoms}
42
52.18 g x 1.7572 g =
91.70 g2
91.690695 g2
91.69 g2
92 g2
43
The accuracy of a measurement
does not depend on the instrument used.
is something scientists rarely achieve.
is how close it is to the accepted value.
indicates that the measurement is also precise.
44
The unit g/cm
3
measures
density
area
mass
volume
45
What is the volume of rectangular prisim with the dimensions 2m x 14m x 1m
14m3
28m2
17m3
28m3
46
Combinations of SI base units form
conversion factors
non-SI units
derived units
equalities
47
A 50.0 mL beaker contains 680. g mercury. What is the density of mercury?
1.36 g/mL
3.40 x 104 g/mL
34.0 g/mL
13.6 g/mL
48
The density of an object is 4.78 g/mL. What is the volume if the mass is 2.34 kg?
11.2 mL
0.490 mL
2.04 x 10-6 mL
490. mL
