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Chem 1 Review Flashcards | StudBud
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Chem 1 Review
Chem 1 Review
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Chem I review #chemistry
Flashcards
33 cards
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Practice quiz
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Questions
33
Answers
1
What is the coefficient on water when this equation is balanced?
4
5
1
2
2
The correct name for MnCl
2
is ________.
manganese chloride
dichloromagnesium
manganese(II) chloride
manganese dichloride
3
The empirical formula for C
4
H
10
is ________.
C4H5
C2H5
CH
CH5
4
What is the charge on this ionic compound?
-1
-8
0
+1
5
In the following isotope, the number 84 is the _______.
electronic number
atomic number
atomic mass
mass number
6
What is the correct formula for magnesium nitrate?
MgNO3
Mg3N2
Mg(NO3)2
Mn3N7
7
The Law of Conservation of Mass states _____________.
mass of the reactants should equal mass of the products
only subscripts may be changed when balancing an equation
energy increases during a reaction
atoms are created in chemical reactions
8
An example of a heterogeneous mixture is _____________.
salt water
milk
air
dirt
9
How many neutrons does krypton-84 have?
84
48
0
36
10
________ is a diatomic element.
lithium
iodine
iron
helium
11
How many moles are in 3.0 x 10
23
atoms of zinc?
30
1
2
0.5
12
This target represents _______.
accurate AND precise
only precise
NEITHER accurate NOR precise
only accurate
13
Which of the following is NOT an SI unit?
second
pound
mole
gram
14
In 1 mole of potassium iodide, there are ______________.
2 atoms
6.022 x 1023 formula units
1 g
166 g
15
This is the Bohr model of what element?
iron
silicon
aluminum
cobalt
16
The phases A, B, and C are
gas, liquid, solid
gas, solid, liquid
solid, liquid, gas
liquid, solid, gas
17
Every atom of neon ______________.
has 10 protons
has 10 neutrons
weighs 20.18 amu
has 10 electrons
18
The charge on an ion of Zinc is
+1
+2
+12
varies
19
When a large atom splits into smaller pieces, this is called
fusion
fission
ultraviolet radiation
radio waves
20
A mystery element has 2 isotopes, X-50 and X-51, in a 75:25 ratio. What's the atomic mass of X?
50.5
101
50
50.25
21
In the chemical formula C
4
H
10
, the subscript 10 means ________.
40 atoms total
10 atoms of hydrogen
10 moles of hydrogen
10% hydrogen
22
In this mass vs. volume graph, which element is more dense?
there is not enough info to tell
aluminum
they have the same density
copper
23
This is evidence of
a physical change
a chemical change
a phase change
evaporation
24
The mass of an electron is ______
1 gram
effectively 0
1 amu
it depends on the type of atom
25
How many significant figures does 6.030 x 10
2
have?
4
3
2
6
26
A sample has a mass of 8.0 g and a volume of 2.0 mL. What is it's density?
16 g/mL
4 g/mL
1 g/mL
0.25 g/mL
27
Which of these is a pure substance?
salt water
air
salt
salt and pepper
28
The Lewis dot structure of an atom of silicon will have ____ pairs of nonbonding electrons.
1
4
2
0
29
What ion does Calcium make?
+2
+1
-2
20
30
This part of the periodic table is called __________.
the actinides
the halogens
the d block
the metalloids
31
Properties of ruthenium include
it is powdery
it conducts electricity
it's a gas
it is brittle
32
Which of these elements is in period 4 of the periodic table?
chromium
zirconium
silicon
beryllium
33
Chemistry is
what makes the world go 'round
the best class evar
the study of matter and changes in matter
wicked awesome
