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Midterm Chem 1
C3H4 + O2 --> 3CO2 + H2O
What number below has five sig figs?
Midterm Chem 1
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1
What number below has five sig figs?
23410
0.01783
10.292
0.00652
2
C
3
H
4
+ O
2
--> 3CO
2
+ H
2
O
synthesis
combustion
double replacement
single replacement
3
What is the coefficent for iron?: Fe
3
O
4
+ Al --> Al
2
O
3
+ Fe
9
6
3
4
4
Base unit for mass:
millimeter
meter
kilometer
grams
5
What is in the nucleus?
tightly packed neutrons
tightly packed protons and neutrons
tightly packed protons
loosely packed protons and neutrons
6
What coefficents balance the equation?NH
4
NO
2
--> N
2
+ H
2
O
1, 1, 2
2, 1, 1
1, 2, 2
2, 2, 2
7
An equation is balanced when
there is the same number of atoms on both sides
products and reactants are the same chemical
coefficents are the same on both sides
subscripts are the same on both sides
8
Cl
2
+ 2KBr --> 2KCl + Br
2
single replacement
synthesis
decomposition
double replacement
9
CaSO
4
calcium (II) sulfate
calcium sulfate
calcium sulfur monoxide
calcium monosulfate
10
What did we discover in the gold foil lab?
electron
proton
nucleus
neutron
11
In a double replacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride and
potassium chloride
sodium hydroxide
hydrogen
water
12
The equation AX --> A + X
decomposition
synthesis
single-replacement
double-replacement
13
Who proposed the atomic theory?
Rutherford
Bohr
Dalton
Thompson
14
Within a group of elements, as the atomic number increases, the atomic radius
decreases
increases
explodes
stays the same
15
Oxygen has 8
electrons in the nucleus
energy levels
protons in the nucleus
neutrons outside the nucleus
16
Ions are atoms of an element that have different
electrons
neutrons
masses
protons
17
Al
2
O
3
dialuminum trioxide
aluminum oxide
aluminum (III) oxide
aluminum trioxide
18
How many electrons can occupy the s orbitals at each energy level?
eight
two
six
one
19
When an atom has an unequal sharing of electrons, the bond is called
polar
nonpolar
bipolar
dipolar
20
The symbols of length in order from smallest to largest are:
mm, m, cm, km
m. cm. mm. km
km, mm, cm, m
mm, cm, m, km
21
Silicon is a
transition metal
metal
metalloid
non-metal
22
Metalls are malleable because they
hold layers of ions in rigid positions
are easily broken
allow one plane of electrons to slide past another
do not produce ions
23
What is the balanced equation when aluminum reacts with copper (II) sulfate
Al + CuSO4 --> AlSO4 +Cu
2Al + Cu2SO4 --> Al2SO4 + 2Cu
Al + Cu2S --> Al2S + Cu
2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu
24
Pb(NO
3
)
2
+ 2KI --> PbI
2
+ 2KNO
3
single replacement
synthesis
decomposition
double replacement
25
tin (IV) chromate
Sn(CrO4)4
Sn(CrO4)2
Sn2(CrO4)4
Sn2(CrO4)
26
What did we discover in the cathode ray experiment?
proton
electron
neutron
nucleus
27
The greater the electronegativity difference between two bonded atoms, the greater the percentage of
electron sharing
ionic character
metallic character
covalent character
28
Magnesium bromide and chlorine yield
Mg and BrCl
MgCl and Br
MgCl2 and Br2
MgBrCl
29
Most of the volume of the atom is occupied by the
protons
nucleus
nuclides
electron cloud
30
2Al + 3Fe(NO
3
)
2
--> 3Fe + 2Al(NO
3
)
2.
Iron has been replaced by
nitrogen
aluminum
nitrate
water
31
Which does NOT indicate a chemical reaction?
precipitate
change in the mass
gas
heat and light
32
Elements in the same group have similiar
atomic number
properties
number of neutrons
atomic masses
33
Isotopes are atoms of the same element that have different
electrons
masses
chemical properties
protons
34
diphosphorus pentoxide
P2O3
PO
P2O5
P5O2
35
Magnesium hydroxide decomposes to yield magnesium oxide and
oxygen
hydrogen
water
salt
36
ammonium nitrate
NH4NO3
(NH4)2NO3
(NH4)3N
AlN3
37
The element with the electron configuration [Ne]3s
2
3p
2
S
C
Mg
Si
38
An atom of Calcium is ____ than an atom of Potassium
the same as
smaller than
larger than
can't tell
39
Mendeleev organized the periodic table by increasing atomic
density
number
reactivity
mass
40
A sphere represents
a p orbital
an f orbital
a d orbital
an s orbital
41
A measurement has good precision if it
has a large number of sig figs
is close to the target
has a small number of sig figs
is close to other measurements
42
An atom of potassium has 19 protons and 20 neutrons. What is it's mass number?
10
19
39
20
43
How would you write hydrogen gas?
H2
H
OH
2H
44
The size and shape of the electron cloud is most closely related to the electron's
charge
spin
mass
energy
45
2,500 kg is equal to:
2,500,000 grams
2,500 grams
2.5 grams
25 grams
46
In a combustion reaction a fuel (CH) always combines with
nitrogen
oxygen
carbon
hydrogen
47
How many double bonds in HF
two
three
one
zero
48
How many double bonds in CO
2
zero
two
three
one
49
The periodic law allows some properties of an element to be based on its
symbol
repeating properties
color
number of isotopes
50
2Mg + O
2
--> 2MgO
single replacement
decomposition
double replacement
synthesis
