PQ Flashcards
When nature behaves in a certain way over and over again, under all sorts of different conditions, we can
summarize that behavior (typically a relationship), it is called a(n) _____.
Law
A(n) _______ is formed after an observation and attempts to provide a testable explanation of an observed behavior of
some natural phenomenon.
hypothesis
A(n) _____ is a model that is based on a set of tested hypotheses and gives an overall explanation of some natural
phenomenon.
theory
Which of the following statements are incorrect?
a) The state of matter for an object that has a definite volume but not a definite shape is a liquid state
b) The state of matter for an object that has both definite volume and definite shape is solid state
c) The state of matter for an object that has a definite shape and is highly compressible is gaseous state
d) The state of matter for an object that has no definite volume and takes the shape of its container is gaseous state
e) The state of matter for an object that is rigid is solid state
C).
An example of a pure substance is ____.
a) an element
b) a compound
c) H2O
d) carbon dioxide
e) all of these
E).
. An example of an element is ____.
a) chicken noodle soup
b) powerade
c) air inside a balloon
d) lead pipe
e) baking soda (NaHCO3)
D).
. An example of a compound is _____.
a) chicken noodle soup
b) powerade
c) air inside a balloon
d) lead pipe
e) baking soda (NaHCO3)
E).
An example of a homogeneous mixture is _____.
a) chicken noodle soup
b) powerade
c) a balloon filled with air
d) lead pipe
e) baking soda (NaHCO3)
B).
An example of a heterogeneous mixture is _____.
a) chicken noodle soup
b) powerade
c) air inside a balloon
d) lead pipe
e) baking soda (NaHCO3)
A).
Select the incorrectly matched pair for unit and dimension.
a) Time – seconds
b) Amount of substance – grams
c) Mass – kilograms
d) Length – meters
e) Volume – cubic centimeters
B).
Which of the following metric relationships is incorrect?
a) 1 microliter = 10–6 liters
b) 1 gram = 103 kilograms
c) 103 milliliters = 1 liter
d) 1 gram = 102 centigrams
e) 10 decimeters = 1 meter
B).
- 0 ng is equal to
a) 2.0 x 10-7 g
b) 2 x 103 g
c) 2.0 x 10-9 g
d) 2.0 x 109 g
e) 2.0 x 107 g
C).
Perform the indicated mathematical operation and round the answer to the correct number of significant figures.
4201.5 – 0.08 + 181/0.544 =
a) 4530 b) 4534.14 c) 4534 d) 4534.1 e) 4500
C),
How close a measured number is to other measured numbers is _____.
precision
How close a measured number is to the true value is _____.
c) accuracy
A dozen doughnuts is an example of _____.
b) exact number
A BMI of 21 is an example of _____.
a) measured number
424 Kelvin equals
a) 151 °F
b) 273 °F
c) 697 °F
d) 151 °C
e) 697 °C
D).
- 2°F is equal to _____ °C.
a) 36.2
b) 4.20
c) 33.2
d) 18.4
e) 60.0
D).
Calculate the volume of silver metal that weighs exactly 2.50 kg. The density of silver is 10.5 g/cm3.
a) 0.238 mL
b) 238 mL
c) 26.3 mL
d) 4.20 mL
e) 0.00420 mL
B).
Calculate the density (in g/mL) of an object that has a mass of 12.2 g and occupies a volume of 0.50 m3.
a) 2.4 x 10-5 g/mL b) 24 g/mL c) 0.24 g/mL d) 4.1 x 10-2 g/mL e) 4.1 g/mL
A).
Calculate the mass of an object that has a volume of 100.0 L and a density of 1.00 g/mL.
a) 100. g b) 1.00 x 105 g c) 1.00 x 103 g d) 1.00 x 10-2 g e) 1.00 g
B).
Which one of the following is not one of the postulates of Dalton’s atomic theory?
a) Atoms are composed of protons, neutrons, and electrons.
b) All atoms of a given element are identical; the atoms of different elements are different and have different
properties.
c) Atoms of an element are not changed into different types of atoms by chemical reactions: atoms are neither
created nor destroyed in chemical reactions.
d) Compounds are formed when atoms of more than one element combine; a given compound always has the same
relative number and kind of atoms.
e) Each element is composed of extremely small particles called atoms.
A)
Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?
a) NH4 and NH4Cl
b) ZnO2 and ZnCl2
c) H2O and HCl
d) NO and NO2
e) CH4 and CO2
D).
