Download Chemistry Unit Test Review

Chemistry Unit Test Review
Why are Nitrogen and Arsenic
chemically similar?
• A. They are both metals
• B. They both have the same number of
valence electrons.
• C. They are in the same period.
• D. They are not chemically similar.
Students added liver to hydrogen
peroxide. The mass of the
substance after the reaction took
place was less than the mass
before. What might have accounted
for the mass being different after?
Classify these properties. Explain
why you classified them as you did.
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A. Ductile
B. Malleable
C. Dull
D. Luster
E. Good Conductor
F. Good Insulator
G. Shatter easily
H. Brittle
What are some physical
properties of Group 18?
Ca(NO3)2
How many Ca atoms are in
2 molecules of the compound
above?
What is a precipitate?
True or False
• Carbon, Oxygen, and Hydrogen are
all elements that are used to form
organic compounds.
Classify the following as physical or
chemical change.
• A. a precipitate is formed from two liquids
• B. a heated liquid turns to a gas
• C. a beaker gets hot after combining
chemicals
• D. two clear liquids form a white substance
• E. gas is formed after combining liquids
• F. substances mix together
When a chemical change occurs…
• A. a change of state takes place
• B. A new substance with new properties
has formed
• C. Less matter is present after the
substances are joined
• D. More matter is present after the
substances are joined
Calculate the density of the
following object.
Object X
Mass = 4 g
Volume = 2 cm3
Does the following equation
represent the Law of Conservation
of Mass during a chemical
reaction? Explain.
Mg + Cl2  MgCl
Calculate
the density
of the liquid
sample
using the
data given.
Liquid Sample Data
Table
Mass of
the
75.5 g
beaker
and liquid
Mass of
the
empty
beaker
Volume
of the
liquid
70 g
10 mL
How reactive would the element
represented below be? Explain.
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Which group of elements are most
reactive on the periodic table?
Groups on the periodic table
have…
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A. similar number of protons
B. similar chemical symbols
C. similar structure and properties
D. similar atomic masses
How many total atoms are found in
the reactants?
2AgNO3 + CaCl2  2AgCl + Ca(NO3)2
Which element has a mass number
of 12?
Element
Number of Number of Number of
Protons
Neutrons Electrons
Carbon
6
6
6
Magnesium
12
12
12
Lithium
3
4
3
• Look at the Bohr model below. List some
limitations of this model of an atom.
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• What is the charge of this atom’s nucleus?
2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
The equation above is used to show the
combustion of hydrocarbons. What would
2 C4H10 mean in a chemical equation?
A.
B.
C.
D.
4 carbon atoms and 10 hydrogen atoms
8 carbon atoms and 20 hydrogen atoms
8 carbon atoms and 10 hydrogen atoms
4 carbon atoms and 20 hydrogen atoms
Which is not a common physical
property of Fe, Co, Ni, Cu, and Zn?
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A. they are malleable
B. they are good conductors
C. they are ductile
D. they are good insulators
Which element below is a
metalloid?
The table
shows the
number of
protons in an
atom of four
different
elements.
Element
X
Number of
Protons
1
Y
51
Z
8
Q
24
• Describe how the diagram below relates to the
law of conservation of mass.
• How many total atoms are in the reactants side?
• How many total atoms are in the products side?
What is the charge of the nucleus
of an atom of Lithium?
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A. -4
B. 0
C. +3
D. +7