CHEM 1411SAMPLE eXAM 1
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Dec 6, 2023
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1
.
Houston Community College System
Chemistry 1411
EXAM # 1A
The Periodic table of the Chemical Elements
2
CHEM 1411
Sample Exam #1A (1,2, and 3)
Part I. Multiple choice questions. ( 4 points each)
Direction- Please write your correct choice in space provide.
____1.
The distance between carbon atoms in ethylene is 134 picometers. Which of the
following express the distance in meters?
A. 1.34x10
-13
m
B. 1.34x10
-10
m
C. 1.34x10
-7
m
D. 1.34x10
-6
m
____ 2.
Acetic acid boils at 244.2
0
F. What is boiling point in degrees celsius?
A. 167.7
0
C
B. 153.4
0
C
C. 117.8
0
C
D. 103.7
0
C
____ 3.
Which of the following expressed measurement 52,030.2 m in correct scientific
notation?
A. 5.20302x10
4
m
B. 5.203x10
4
m
C. 5.20x10
4
m
D. 5.2x10
4
m
____ 4.
Select the answer with correct number of decimal places for
the following sum.
4.65 g + 2.0 g + 19.6442 g =
A. 26.2942 g
B. 26.29 g
C. 26 g
D. 26.3 g
____ 5.
Which of the following is a non-metal?
A. Li
B. Be
C. Os
D. I
____ 6.
Bromine is the only non-metal that is liquid at room temperature. Consider the
isotope bromine-81,
35
81
Br. Select the combination which list the correct atomic
number, neutron number , and mass number respectively.
A. 35,46,81
B. 35,81,46
C. 81,46,35
D. 46,81,35
____ 7.
Which of the following name is correct for given chemical formula?
A. I
2
O
5
, iodine pentoxide
B. LiNO
3
, lithium nitrate
C. PbO , lead(I) oxide
D. H
2
SO4 , hydrosulfuric acid
____ 8.
Which of the following chemical formula is not correct for given chemical name?
A. ferric oxide , Fe
2
O
3
B. calcium hydroxide , Ca(OH)
2
C. tetrasulfur dinitride , S
4
N
2
D. potassium chlorite , KClO
3
____9.
What is the mass in grams of 0.250 mole common antiacid, calcium carbonate?
A. 4.00x10
2
g
B. 25.0 g
C. 4.00x10
-2
g
D. 2.50x10
-3
g
3
____ 10. Which one of the following reactions is not balanced?
A. 2C
6
H
6(l)
+ 15O
2(g)
à
12CO
2(g)
+ 6H
2
O
(g)
B. B
2
O
3(s)
+ 6HF
(l)
à
2BF
3(g)
+ 3H
2
O
(l)
C. UO
2(g)
+ 4HF
(l)
à
UF
4(s)
+ 4H
2
O
(l)
D. 2B
5
H
9(l)
+ 12O
2(g)
à
5B
2
O
3(s)
+ 9 H
2
O
(g)
____11. Which identification is INCORRECT for the element?
A. Na, sodium
B. S, sulfur
C. P, potassium
D. Zn, zinc
____12. Which of the following is not a chemical change?
A. burning coal
B. making bread rise using baking soda
C. boiling an egg
D. boiling water
____13. Which ion has
a -1 charge?
A. CO
3
B. HSO
3
C. NH
4
D. SO
4
____14. Which of the following is improperly labeled?
A. Cu- transition metal
B. Mg- alkaline earth metal
C. Br- halogen
D. U- noble gas
____15. How many carbon atoms are in CH
3
-CH
2
-COO-CH
3
A. 1
B. 2
C. 3
D. 4
Part II. Show all your work for complete credit.
1. The density of mercury , the only metal to exist as liquid at room temperature, is 13.6
g/cm
3
. What is the density in pounds per cubic inch (lb/in
3
) ? ( 1 lb=454 g , 1 in =2.54 cm)
( 8 points)
2. The speed needed to scape the pull of earth
,
s gravity is 11.3 km/s. What is this speed in
mi/hr ? ( 1 mi=1.6094 km) ( 6 points)
3. Lithium , is used in dry cells and storage batteries and in high temperature lubricants, it
has two naturally occurring isotopes,
6
Li and
7
Li. Calculate the atomic mass of lithium.
( 8 points)
isotopes
isotopic mass(amu)
abundance(%)
6
Li
6.01521
7.50
7
Li
7.016003
92.50
4. Terphthalic acid , used in the production of polyester fibers and films, is composed of
carbon, hydrogen, and oxygen. when 0.6943 g of acid is subjected to combustion analysis
it produced 1.471 g CO
2
and 0.391 g H
2
O. What is its empirical and molecular formula if
its molar mass is 172
g/mol. ( 8 points)
4
5. Aluminum reacts with oxygen to produce aluminum oxide which can be used as an
absorbent, desiccant or catalyst for organic reactions. ( 10 points)
4 Al
(s)
+ 3 O
2(g)
à
2 Al
2
O
3(s)
A mixture of 82.4 g of aluminum (M=26.98 g/mol) and 117.65 g of oxygen (M=32.00 g/mol)
is allowed to react.
a) Identify the limiting reactant.
b) Calculate the mass of aluminum oxide formed.
c) Determine the mass of the excess reactant present in the vessel when the reaction is
complete.
d) What is the percentage yield for the reaction if reaction mixture produce 120 g of
aluminum oxide?
Bonus question( 10 points)- show all your work.
!"
When 11.2 g CaCO
3
reacts with excess hydrochloric acid, as below, 4.61 g of CO
2
is
produced. What is the percent yield of CO
2
? Do not type the units with your answer.
CaCO
3
(s) + 2 HCl(aq)
à
CO
2
(g) + CaCl
2
(aq) + H
2
O(l) (not balanced)
#"
Calcium reacts with oxygen to make calcium oxide, CaO. What is the theoretical yield
of CaO(s) that could be prepared from 7.63 g of Ca(s) and 2.56 g of O
2
(g)?
5
CHEM 1411 SAMPLE EXAM # 1A - KEY (1, 2,
and 3)
PART-I
1.
B (pico = 10
-12
,
134 x 10
-12
m = 1.34 x 10
-10
m)
2.
C
C = 5/ 9(F-32)
=
5/ 9(244.2 - 32)
=
5/ 9(212.2)
= 117.9
o
C
3.
A
4.
D
sum = 26.2942 g ,
round off to the least number of decimal point (one),
sum
=
29.3 g
5.
D
6.
A
7.
B LiNO
3
is Lithium nitrate
8.
D potassium chlorate, KClO
3
9.
B CaCO
3
= 1(40) + 1(12) + 3(16) = 100 g/ml
10. C
2H
2
O
(l)
11. C
P is the symbol for phosphorous
12. D boiling water is a phase change from liquid to vapor
13. B HSO
3
‾
(bisulfite)
14. D
Uranium is an inner transition metal
15. D
four carbon atoms
PART-II
1.
13.6 g
1 lb
(2.54 cm)
3
-----------
x
------------
x
------------------
= 0.491 lb/ in
3
cm
3
454 g
1 in
3
2.
11.3 km
1 mi
3600 sec
-------------
x
----------------
x
----------------
= 2.53 x 10
4
mi/hr
sec
1.6094 km
1 hr
3.
Ave. atomic wt. of Li = (7.50/100) (6.01521) + (92.50/100) (7.016003) = 6.95 a.m.u.
4.
m
c
= (3/11) mCO
2
= (3/11)(1.471) = 0.4012 g ,
m
H
= (1/9) mH
2
O = (1/9) (0.391) = 0.0434 g
m
O
= m - (m
c
+ m
H
) = 0.6943 - (0.4012 + 0.0434) = 0.2497 g
C = 0.4012/12 = 0.0334
,
0.0334/0.01561 = 2.14 = 2
H = 0.0434/1 = 0.0434
,
0.0434/0.01561 = 2.78 = 3
O = 0.2497/16 = 0.01561
,
0.01561/0.01561
= 1
= 1
empirical formula is C
2
H
3
O
= 2(12) + 3(1) + 1(16)
= 43
X = ( 172/ 43)
=
4
,
(C
2
H
3
O)
4
or
C
8
H
12
O
4
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- The answer to 6.626*10^-34 Js (7.40*10^6 m/s)(9.11*10^-28 g) is 9.83*10^-17 g right? That's the answer I got but my digital homework says it's wrong, but like, all my math is checking out that it should be what I got?arrow_forwardPlease answer all questions and show calculations For the image attached For 1. a Mass of metal: Trial 1 is 35.0228 g Trial 2 is 35.0915 g Trial 3 is 34.0821 g Mass of water: Trial 1 is 20.0177 g Trial 2 is 20.0250 g Trial 3 is 20.0168 g For delta t of water: Trial 1 is 15.5 C Trial 2 is 15.7 C Trial 3 is 15.1 C For delta t of metal Trial 1 is 80.1 C Trial 2: 80.2 C Trial 3: 79.5 C For B my calculated Specific heat is: Trial 1 is 0.462 Trial 2 is 0.467 Trial 3 is 0.466arrow_forwardA 11 oz. can of soda contains 26 mg of sodium. How many atoms of sodium are found per mL of the solution? 1 oz. = 29.57 mL Report your answer using scientific notation (e.g., 1.23e15). Report your answer with two significant figures. Do not report units.arrow_forward
- An experiment with a pycnometer resulted in the following data: Mass of Pycnomter = 25.428 g Mass of Pycnometer filled with water = 44.021 grams Mass of Pycnometer filled with liquid X = 41.421 grams a) What is the specific gravity of liquid X? b) If methanol (Specific Gravity = 0.790) was used rather than water in measuring the density of irregular objects, how would that affect the result? Why?arrow_forward1. All answers to be entered via short answer are in the NUMERICAL FORMAT and presented up to the 3rd decimal place. ADD TRAILING ZEROS if necessary, to complete your answer. NO NEED TO INCLUDE THE UNIT for now.For uniformity of answers, please be guided by the following examples:- If your answer is 5.627594, enter 5.628- If your answer is 3.129934, enter 3.130- If your answer is 8.38, enter 8.380- If your answer is 1.2, enter 1.200- If your answer is 25, enter 25.000- If your answer is less than the value of 1, always place a zero before the decimal point (E.g.: if 0.5, enter 0.500)2. In cases for answers in the EXPONENTIAL FORMAT, please be guided by the following examples and format:- Do not convert your answer to decimal format- If your answer from the calculator is 1.23454566 x 10E-4, enter 1.235x10^-4 (no spaces in between)- If your answer from the calculator is 7.379566 x 10E-5, enter 7.38x10^-5 (no spaces in between)3. The ATOMIC MASSES should be rounded to the NEAREST WHOLE…arrow_forwardThe experiment involves diluting a 16% sugar solution, prepared by dissolving 16 g of sugar in 100 mL water. Three different solutions are prepared by mixing the 16% sugar solution with various volumes of water.Make appropriate choices from the dropdowns. Work from left to right. Each answer can be calculated from numbers to the left of it in the row. The objective is to calculate the number in the right-hand most column in each row (% sugar in the solution). 16% sugar solution taken / mL water added/ mL diluted solution / mL Dilutionfactor % sugarin diluted solution 25 25 [ Select right answer] ["50", "25", "100", "150"] [ Select right answer] ["1", "0.5", "2"] [ Select right answer] ["8", "50", "12.5", "25"] 25 8.3 [ Select right answer]…arrow_forward
- Professor Gomez's dogJasper, is a very anxious little guy, so she baked him some treats that contain melatonin to help calm him down. The treats are quite small, and each one contains 150 of melatonin Jasper's veterinarian recommended he take milligrams of melatonin per of body weight per day Jasper weighs exactly 15 lbs. How many of the melatonin containing treats is he allowed to have in one day? Note : 2.20 lb=1 logarrow_forwardShow your work, use general chemistry rules for significant figures. 6. A solution is made by dissolving 1.0 x 10–4 mol of Na3PO4 in 200.00 mL of water. Then 0.25 mL of 0.200 F HCl is added to the solution. H3PO4 ⇌ H+ + H2PO4– Ka1 = 7.11 x 10–3 H2PO4– ⇌ H+ + HPO42– Ka2 = 6.34 x 10–8 HPO42– ⇌ H+ + PO43– Ka3 = 4.17 x 10–13 (a) What is the pH of the resultant solution? (b) An additional 0.75mL of 0.200 F HCl is added to the solution from the end of part (a). What is the pH of the resultant solution? (c) Finally, an additional 0.50 mL of 0.200 F HCl is added to the solution from the end of part (b). What is the pH of the resultant solution?arrow_forwardDaniel Harris has always enjoyed eating tuna fish. Unfortunately, a study of the mercury content of canned tuna in 2010 found that chunk white tuna contains 0.6 ppm Hg and chunk light tuna contains 0.14 ppm2. The U.S. Environmental Protection Agency (EPA) recommends no more than 0.1 μg Hg/kg body weight per day. A person weighs 65 kg. How often may the person eat a can containing 6 ounces (16 oz=1 lb) of chunk white tuna so that they do not average more than 0.1 μg Hg/kg body weight per day? The person can consume one 6 oz can of chunk white tuna every ______ days. If the person switches to chunk light tuna, how often can they eat one can? The person can consume one 6 oz can of chunk light tuna every _______ days. S. L. Gerstenberger, A. Martinson, and J.L. Kramer, "An Evaluation of Mercury Concentrations in Three Brands of Canned Tuna," Environ. Toxicol. Chem. 2010, 29, 237.arrow_forward
- 1) State your interpretation of the meaning of the slope for the first graph you prepared of Volume of Steel Nuts (mL) versus Number of Steel Nuts. Hint: Understanding the meaning of a slope involves several factors: the units which are a ratio of the y axis units over the x axis units, the interpretation of the slope as “number of the y axis units for every one of the x axis units” and the concept that constructing the best line or curve that follows the trend in the data is a sort of averaging of the random error throughout the data.arrow_forwardA 75.42 % mass solution of naquadah (FM naquadah = 160.28 g/mol) in water has a density of 1.175 g/mL. Find the molarity of naquadah in this solution. How many mL of 7.791 M naquadah should be diluted to a volume of 300.00 mL to give a solution with a concentration of 3.03 M? A naquadah solution has a molarity of 0.43118023 M with a relative uncertainty of 0.12760507%. What is the concentration and its absolute uncertainty rounded to an appropriate number of digits? a. 0.43 +/- 0.06 M b. 0.431 +/- 0.001 M c. 0.4312 +/- 0.0006 M d. 0.43118 +/- 0.00006 M e. 0.431180 +/- 0.000013 Marrow_forwardCan you explain the concept? How do I do the calculations? For example, where did the 4x2 came from?arrow_forward
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