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CHM 1045 Exam 1 Review Flashcards | StudBud
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CHM 1045 Exam 1 Review
CHM 1045 Exam 1 Review
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1
What is the charge of C
2
H
3
O
2
in Mg(C
2
H
3
O
2
)
2
?
+2
+1
-2
-1
2
How many significant figures are in the answer of 8.578/4.33821?
4
3
5
6
3
If lithium loses an electron, what will its charge be?
-1
-2
+2
+1
4
Is (NH
4
)
2
CO
3
ionic or covalent?
ionic
covalent
5
Which is the best reading from this graduated cylinder?
21 mL
20 mL
22 mL
21.6 mL
6
The reaction should take 12.71 s. You obtain times of 10.75, 10.71, 10.72 and 10.69 s. Which best describes the data?
inaccurate and imprecise
precise and inaccurate
imprecise and accurate
accurate and precise
7
Balance the equation Al + O
2
→ Al
2
O
3
. What is the coefficient of Al?
4
3
1
2
8
Write the formula of the compound they will form: Mg
2+
, PO
4
3−
Mg(PO4)2
Mg2(PO4)3
Mg3PO4,2
Mg3(PO4)2
9
How many significant figures are in 23,000?
5
4
3
2
10
What is the molarity of a solution formed from 6.75g of NaCl (aq) to make solution with a total volume of 425mL?
0.116 M
0.116 m
0.256 m
0.256 M
11
Physical or chemical? Your friend leaves bread in the toaster too long. The bread turns black and kitchen is smoky.
chemical
physical
12
How many neutrons does Titanium-48 have?
26
22
48
47.8
13
Express the following number in exponential notation with correct significant figures: 0.00000006510
6510x10-11
6.51x10-8
6.510x10-8
651x10-10
14
A compound contains 30% N and 70% O. If the molecular mass of the compound is 80.0 g/mol, what is the molecular formula?
NO2
O7N2
O3N4
N2O4
15
NutraSweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O. Calculate the empirical formula of NutraSweet.
C16H2N14O3
C14H18N2O5
C7H9NO2.5
C12H8O2
16
What is the mass of 17.0 mL nicotinamide in SI units, density = 1.40 g/cm
3
?
0.0238 kg
0.0121 kg
23.8 g
12.1 g
17
Determine the mass in grams of 0.600 mol of ozone molecules, O
3
.
9.60 g
19.2 g
28.8 g
56.4 g
18
Name HNO
3
nitrous acid
hydrogen mononitrate
nitric acid
hydrogen nitrite
19
What are the atomic mass, number of neutrons, and the number of electrons in Br
-
?
80, 45, 35
35, 45, 36
80, 35, 35
80, 45, 36
20
Which does NOT fit in the same periodic group as the rest, and therefore has different properties?
magnesium
strontium
chromium
calcium
21
Which term best describes the following: all samples of a pure compound contain the same elements in the same proportion
law of conservation of mass
law of definite proportions
law of multiple proportions
Dalton's law of atomic theory
22
Name CuCl
2
copper dichloride
copper (I) chloride
copper chloride
copper (II) chloride
23
Which of the following is not a metalloid?
gallium (Ga)
boron (B)
antimony (Sb)
silicon (Si)
24
Which is not part of Dalton's atomic theory?
The basic elements are earth, air, wind, and fire
Atoms of one element differ in properties from atoms of all other elements
Matter is composed of exceedingly small particles called atoms
A compound always has atoms in the same ratio
25
If 0.1718 L of a 0.3556-M C
3
H
7
OH solution is diluted to 0.1222 M, what is the volume of the resulting solution?
0.3556 M
0.1222 M
0.5000 L
0.2500 L
26
Give the name of the prefix associated with 10
3
mega-
kilo-
milli-
deci-
27
Convert the boiling temperature of platinum, 4098 K, into degrees Fahrenheit and Celsius.
2107oF and 3825oC
6917oC and 3825oF
4371oC and 7900oF
6917oF and 3825oC
28
Which of the following best describes the issue with your data collection in the previous question?
random error
gross error
systematic error
systematic sampling
29
Physical or chemical? Food coloring is dropped into water to give it color.
physical
chemical
30
What is the mass percent of Na in NaOH?
57%
76%
23%
16%
31
Which is
not
diatomic?
carbon
oxygen
bromine
iodine
32
How many electrons are present in the following atom:
36
17
Cl
-
?
17
37
18
35
33
Name P
4
O
6
hexaphorphorous tetroxide
phosphorous (IV) oxide
tetraphosphorus hexoxide
phosphorus oxide
34
If ClO
4
-
is perchlorate, what is the name of HClO
4
?
perchloric acid
acetic acid
chloric acid
perchlorous acid
35
Balance the equation Al + HCl → AlCl
3
+ H
2
. What is the coefficient of HCl?
6
3
2
7
36
What are the elements in group 2 of the periodic table called?
halogens
alkali metals
noble gases
alkaline earth metals
