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. lia Narri Student Information 1220 Cofteen St IL! Jl“ “ yirrlgirl eSS wiy]CC - St ' i ¥} udent I Learning Online Watertown, NY 13601 I Courses I Community 2022 Spring ONLIB_CHE_107_1 (CHE_107_E1) - Intro to Chemistry 1 Homework Review Test Submission: Homework#2 Review Test Submission: Homework#2 User Julia Michelle Narrigan Course 2022_Spring_ONLIB_CHE_107_1 (CHE_107_E1) - Intro to Chemistry 1 Test Homework#2 Started 2/23/22 9:11 PM Submitted 2/23/22 9:44 PM Due Date 2/23/22 11:59 PM Status Completed Attempt Score 8 out of 10 points Time Elapsed 33 minutes Results Displayed All Answers, Submitted Answers, Correct Answers, Incorrectly Answered Questions Question 1 0.25 out of 0.25 points - Which Greek philosopher thought that matter was infinitely divisible? v Selected Answer: @ d. Zeno Answers: a. Aristotle b. Democritus c. Plato @ d. Zeno Question 2 0.25 out of 0.25 points How many elements occur naturally as diatomic molecules? | Selected Answer: @ d. 7
Answers: a.0 Question 3 0 out of 0.25 points Which of the following laws enables us to characterize a compound by a specific chemical formula? Selected Answer: ¢ p, the law of conservation of mass Answers: a. the law of conservation of energy p. the law of conservation of mass @ c the law of constant composition d. all of these Question 4 0.25 out of 0.25 points What is the mass number of an atom that is made up of 38 protons, 49 neutrons, and 38 electrons? v Selected Answer: «, ¢ 87 Answers: a. 38 b. 49 Question 5 0.25 out of 0.25 points What are the horizontal rows of the periodic table called? Selected Answer: &, p, periods Answers: a. cycles @ b. periods
C. families d. none of these Question 6 0.25 out of 0.25 points Which of the following contains two species which are a pair of isotopes? Selected Answer: b, 12C and 13C Answers; a 14C and 14N o b, ?Cand 3¢ c both 14¢ and 14y and 12¢ and 13¢ d neither 14¢ and 14y or 12¢ and 13¢ Question 7 0.25 out of 0.25 points - Which of the following contains only nonmetals? v Selected Answer: &, ¢ F, Cl,He,and C Answers: a. C, Si, B, and Be b. P, B, Si, and Na @ c F, Cl, He, and C d. none of these Question 8 0.25 out of 0.25 points Which of the following best compares Democritus’s view of matter and our current view? Selected Answer: @ c The ancient view is based on thought only, but the current view is based on experimental evidence. Answers: a. Both views are based on belief only. b, Both views are based on firm experimental evidence. @, c. The ancient view is based on thought only, but the current view is based on experimental evidence.
d. Both views are based on a combination of thought and experimental evidence. Question 9 Which element is currently used to define the atomic mass unit? Selected Answer: &, | carbon-12 Answers: a. hydrogen-1 @ b, carbon-12 c. Oxygen-16 d. none of these Question 10 Which of the following subatomic particles are found in the nucleus? Selected Answer: @ d. protons and neutrons Answers: a. clectrons p. neutrons ¢. protons @ d. protons and neutrons Question 11 How many elements are there in period 3? Selected Answer: @ c 8 Answers: a. 2 0.25 out of 0.25 points 0.25 out of 0.25 points 0.25 out of 0.25 points
Question 12 0.25 out of 0.25 points Which of the following defines the mass number of an atom? Selected Answer: &, , the total number of protons and neutrons in the atom Answers: a. the number of protons in the atom b, the number of neutrons in the atom @, c. the total number of protons and neutrons in the atom d. the total number of protons, neutrons, and electrons in the atom Question 13 0 out of 0.25 points Which column of the periodic table contains the halogens? X Selected Answer: Q d. 8A Answers: a. 1A b. 4A o C. 7A d.8A Question 14 0.25 out of 0.25 points Which of the following is true of the atomic weight of an element? Selected Answer: @ d. It is a weighted average obtained from the weights and abundances of the isotopes. Answers: a. It is the weight of the heaviest isotope. b, It is the weight of the lightest isotope. c. It is the weight of the most abundant isotope. @ d. It is a weighted average obtained from the weights and abundances of the isotopes. Question 15 0.25 out of 0.25 points Which of the following statements describes a compound?
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QUESTION 2
Three separate lab groups determined the density of a metal to be 12.5 g/mL, 13.1 g/mL and 14.8 g/mL. Use these values to
calculate the average density among the measurements.
O A. 13.5 g/mL
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T-=Instructions: Select the best answer, by highlighting your
chosen answer, to complete the following questions.
1. Mass divided by volume is the formula for which physical
property?
a. Weight
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which tYpe of properties include color, shape, size, and
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d. None of the above
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3. which of the following is a chemical property of a
substance?
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4. Which physical property is a size dependent property?
a. Mass
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5. which physical property is a size independent property?
a. Color
b. Mass
C. Mass
d. Reacts with acid
C. Volume
d. AIl of the above
c. Boiling point
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Al
Si
S
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Study the chart of electronegativity values. Choose the correct observation,
O A. As the atomic number increases across a period, electronegativity decreases.
O B. As the atomic number increases across a period, electronegativity also increases.
O C. Metals have the highest electronegativity.
OD Elements with the most rings have the highest electronegativity.
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2. The following eight structures are all isomers of C6H14O. Each structure corresponds to one
of the predicted ¹H NMR spectra pictured on the next two pages of this document. The
integral values for each peak are next to that peak. Indicate which structure matches each
spectrum by drawing the structures in the boxes along the right side of the pages. Use the
letter codes provided to label the chemically equivalent hydrogens on the structures. One
example is provided.
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26) The floor tiles in SE 27 are about 1 square foot and the lab is about 25 tiles wide and about
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the water in the trash can was about 1 foot deep. One student estimated this was 2.5 gallons.
Estimate how deep the room will get in inches after a 15 minute shower. List 3 simplifving
assumptions you make in this calculation
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Find AG for the following reaction, at 25°C, using AH and S values.
f
NHẠCI(s) → NH3(g) + HCI(g)
kJ
Standard Thermodynamic Values at 298 K
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186.79
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IWE: Half-Reaction Method of Balancing Aqueous
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Balance each of the following redox reactions
occurring in acidic aqueous solution.
K(s) + Cr³+ (aq) → Cr(s) + K+ (aq)
Express your answer as a chemical equation including phases.
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A chemical reaction does not occur for this question.
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Al(s) + Fe²+ (aq) →
A1³+ (aq) + Fe(s)
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A 130.3 g piece of copper (specific heat 0.38 Jİ •°C) is heated and
then placed into 400.0 g of water initially at 20.7°C. The water
increases in temperature to 22.2°C. What is the initial temperature of
°C
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Using the information in the table, the rate law for the reaction A(g) + 3 B(g) →
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Rate
[A], (M)
[B], (M)
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Tme following tabie compares irie mass of packaging, tolal cost and Tiumber of servirigs of irOzen
concentrate and drinking boxes. Use the table to answer questions 40-41
Servings of
Prepared
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Volume of
Mass of
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Total Cost
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33.66
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2.58
40. Calculate the mass of packaging per serving for both frozen concentrate and drinking boxes. Use the
following formula.
Mass of packaging
Mass of Package
per serving
Number of Servings
Calculations: 123.88
41. Calculate the cost per serving for both frozen concentrate and drinking boxes. Use the following
formula.
Total Cost
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1-5
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2.5
3-0
3-5
Na
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Si
S
CI
0-9
1-5
1-8
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2-1
2-5
3-0
K
Ca
Ga
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Br
0-8
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2-8
Rb
Sr
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1-0
1-7
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2-5
Cs
0-7
Ba
TI
Bi
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2-2
Review the chart above. It is showing how much energy it takes to remove an electron from each of those types of atoms. Why would
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1-9
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it be so high in the top right comer and so low in the lower len comer?
It would be high in the top right coner because these electrons are closer to the nucleus and held more strongly, so they will take
O A. more energy to remove.
And the opposite is true for the lower left, farther from the nucleus and so not held as strongly, requiring less energy to…
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The reactant concentration in a first-order reaction was 9.80x 10-2 M after 35.0 s and 8.60x10-3 M after 85.0 s
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Express vaur answer with the annronriate nits Indicate the munltinlication of units s necessan
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Enzymes lower the activation energy of a chemical reaction. This means that the reaction is more likely to proceed, and results in faster formation of products.
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Complete this vocabulary exercise relating to enzymes.
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A chemical engineer is studying the two reactions shown in the table below.
In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 53.0 °C and constant total pressure. Then,
he measures the reaction enthalpy AH and reaction entropy AS of the first reaction, and the reaction enthalpy AH and reaction free energy AG of the second
reaction. The results of his measurements are shown in the table.
Complete the table. That is, calculate AG for the first reaction and AS for the second. (Round your answer to zero decimal places.) Then, decide whether, under
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When entering large numbers in the answer box, do not use commas. For example, enter 1276400 for the number 1,276,400. Do not enter 1, 276, 400. If you accidentally
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3240?
Express your answer numerically to at least three significant figures.
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Solving part B and C
E°cell from part A = 2.33V
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For each of the following equilibria, write the
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Y
Part A
2N₂Os (9) 4NO₂(g) + O₂(g)
O Ke =
O K₂=
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Part B
[NO₂[0₂]
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N₂0₂
N₂O₁]
NO₂0₁
N₂O,
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3F2(g) + Cl₂ (9) 2CIFs (9)
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For the following reaction, 24.7 grams of sulfur dioxide are allowed to react with 9.95 grams of oxygen
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What is the maximum mass of sulfur trioxide that can be formed?
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Predicting the effect of carbocation stability on the rate of...
For each pair of substrates below, choose the one that will react faster in a substitution reaction, assuming that:
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2. doesn't depend on the concentration of the other reactant at all.
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