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CHM151 Exam #1 Review Flashcards | StudBud
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CHM151 Exam #1 Review
CHM151 Exam #1 Review
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CHM151 - General Chemistry I Exam #1 Matthews-Chemistry: A Novel (Textbook) Chapters 1-3
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1
Which one is NOT an intensive property of matter?
density
mass
color
malleability
2
Rutherford's experiment also proved this about the nucleus...
It can be seen with a microscope.
It is made of protons and neutrons.
It has great mass compared to the rest of the atom.
It is gold in color.
3
From the density equation, we can calculate mass as ___
density x volume
volume x gravity
mass ÷ density
volume x mass
4
Write the chemical formula for barium nitride.
Ba3N2
BaN
Ba2N3
BaN2
5
Dalton’s atomic theory states that ___.
Atoms can combine to form compounds
All of the above
All atoms of an element are alike
The atoms of different elements are different
6
What is the SI base unit of mass ?
kilogram
pound
gram
ounce
7
Write the chemical formula for: Copper(II) sulfate pentahydrate
CuSO4 • 5 H2O
CuSO4 • 7 H2O
Cu2SO4 • 5 H2O
CuSO4
8
Mass doesn't change but weight can.
false
true
9
Why is the law of conservation of mass true?
the substances gain more atoms at the beginning of reaction
all molecules at the start of reaction are there at the end
all atoms at start of reaction are there at end
10
A substance is ____.
a form of matter that has a definite composition and distinct properties
a mixture of compounds with a uniform composition
a form of matter that cannot be separated into simpler parts
a compound with two or more atoms
11
Which of the following is
not
needed to calculate the atomic mass of an element?
% abundance
masses
which isotopes exist
Number of Protons
12
Find the average atomic mass of element X
19.992 amu
20.993 amu
none of these
20.157 amu
13
What did Ernest Rutherford discover about atoms?
That they have a positively charged nucleus
That they are not mostly empty space
That alpha particles cannot pass through atoms
That atoms have positively charged particles floating about
14
The atomic number is the number of neutrons in the nucleus of an atom.
True
False
15
Covalent compounds form by transferring electrons from one atom to another.
True
False
16
Isotopes of an element have the same number of neutrons, but different numbers of protons.
True
False
17
Mixtures can be classified as:
homogeneous and heterogeneous
elements
pure substances
uniform and nonuniform
18
What is the atomic mass of Calcium?
30.01
41.00
39.05
40.08
19
A theory is an educated guess, based on observations.
False
True
20
Atomic Mass?
20.1797
10
Ne
20
21
Round 866 to 2 significant figures:
800
860
900
870
22
Atomic Number?
10
20
Ne
20.1797
23
Ionic compounds ___.
are all of these
are composed of ions
usually form between metals and a nonmetals
are a 3-dimensional networks of ions
24
How many neutrons are in the isotope Carbon-14?
8
14
12
6
25
Write the chemical formula for dinitrogen pentoxide.
N5O2
N2O5
NO5
NO
26
Which pair consists of a molecular formula and its corresponding empirical formula?
C8H18 and C4H9
NaHCO3 and Na2HCO
Na8Cl and NaCl
H2O2 and H4O
27
An isotope of americium has 146 neutrons. How is this isotope written?
Am-95
146Am
241Am
95Am
28
Write the name of the following compound: NO
Nitrogen oxygen
Nitrogen monoxide
Nitrogen oxide
Nitrogen dioxide
29
Write the chemical formula for magnesium chlorate.
Mg(ClO2)2
Mg(ClO3)
Mg(ClO3)2
MgCl2
30
The Law of Conservation of Mass states ___ in chemical reactions
matter is not real
matter can be created and destroyed
matter can not be created but it can be destroyed
matter cannot be created and it cannot be destroyed
31
The number 0.09010 has three significant figures.
True
False
32
An extensive property is...
the quality or condition of a substance
the property that depends on the type of matter
the property that depends on the amount of matter
a form of matter
33
Define Empirical Formula:
The simplest whole-number ratios by which elements combine.
The expanded decimal ratios by which elements combine
The simplest decimal ratios by which elements combine.
The expanded whole-number ratios by which elements combine.
34
What is a cation?????
An atom with more protons than neutrons
A compound with a total charge of zero
An atom or group of atoms with a negative charge
An atom or group of atoms with a positive charge
35
Physical or Chemical property?
flammability
Chemical
Physical
36
Write the name of the following compound: V(ClO
2
)
5
Vanadium chlorate
Vanadium chlorite
Vanadium(V) chlorite
Vanadium(V) chlorate
37
What are the states of matter?
solid, liquid, and juice
solid and gas
solid and liquid
solid, liquid, and gas
38
Physical or Chemical property?
Malleability
Physical
Chemical
39
Name the following compound: NiCO
3
.
Nitrogen(I) chloride
Nickel(II) carbonate
Nitrogen(III) carbonate
Nickel(II) cadmium
40
What is the name of the following compound: CoCl
2
•6H
2
O
Cobalt(II) dichloride hexahydride
Cobalt dichloride
Cobalt(II) chloride hexahydride oxide
Cobalt(II) chloride hexahydrate
41
All of Dalton's atomic theory was correct.
True
False
42
What is the molecular weight of MgF
2
?
38.00
19.00
62.31
43.31
