Chemistry
13th Edition
ISBN: 9781260162370
Author: Chang
Publisher: MCG
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Textbook Question
Chapter 1.7, Problem 1RCF
The density of platinum is 21.45 g/cm3. What is the volume of a platinum sample with a mass of 11.2 g?
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Decide whether these proposed Lewis structures are reasonable.
proposed Lewis structure
Yes.
Is the proposed Lewis structure reasonable?
Cl-
: 2:
:Z:
:Z:
N—N
: 0:
C C1:
O CO
No, it has the wrong number of valence electrons.
The correct number is: ☐
No, it has the right number of valence electrons but doesn't satisfy the
octet rule.
The symbols of the problem atoms are:* ☐
Yes.
No, it has the wrong number of valence electrons.
The correct number is: ☐
No, it has the right number of valence electrons but doesn't satisfy the
octet rule.
The symbols of the problem atoms are:* |
Yes.
No, it has the wrong number of valence electrons.
The correct number is:
No, it has the right number of valence electrons but doesn't satisfy the
octet rule.
The symbols of the problem atoms are:* |
If two or more atoms of the same element don't satisfy the octet rule, just enter the chemical symbol as many
times as necessary. For example, if two oxygen atoms don't satisfy the octet rule, enter "0,0".
☑
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
ΔΗ is
(pick one)
A
This reaction is faster above 103. °C than
below.
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous only above
-9. °C.
AS is
(pick one)
ΔΗ is
(pick one)
C
The reverse of this reaction is always
spontaneous.
AS is
(pick one)
18
Ar
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
The reverse of this reaction is always
spontaneous but proceeds slower at
temperatures below 41. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
94. °C.
AS is
(pick one)
This reaction is always spontaneous, but
ΔΗ is
(pick one)
C
proceeds slower at temperatures below
−14. °C.
AS is
(pick one)
Х
00.
18
Ar
무ㅎ
B
1
1
Chapter 1 Solutions
Chemistry
Ch. 1.3 - Which of the following statements is true? (a) A...Ch. 1.3 - Prob. 2RCFCh. 1.4 - Which of the following diagrams represent elements...Ch. 1.5 - An ice cube is placed in a closed container. On...Ch. 1.6 - The diagram in (a) shows a compound made up of...Ch. 1.6 - Determine which of the following properties are...Ch. 1.7 - A piece of platinum metal with a density of 21.5...Ch. 1.7 - The density of sulfuric acid in a certain car...Ch. 1.7 - Convert (a) 327.5C (the melting point of lead) to...Ch. 1.7 - The density of platinum is 21.45 g/cm3. What is...
Ch. 1.7 - The melting point of adamantine is 518F. What is...Ch. 1.7 - The density of copper is 8.94 g/cm3 at 20C and...Ch. 1.8 - Determine the number of significant figures in...Ch. 1.8 - Carry out the following arithmetic operations and...Ch. 1.8 - Give the length of the pencil with proper...Ch. 1.8 - A student measures the density of an alloy with...Ch. 1.8 - Four mass measurements of a metal cube were made...Ch. 1.9 - A roll of aluminum foil has a mass of 1.07 kg....Ch. 1.9 - The volume of a room is 1.08 108 dm3. What is the...Ch. 1.9 - The density of the lightest metal, lithium (Li),...Ch. 1.9 - Prob. 1RCFCh. 1.9 - What is the volume in L of a 1.24-kg sample of...Ch. 1.9 - Prob. 3RCFCh. 1.10 - Prob. 9PECh. 1 - Explain what is meant by the scientific method.Ch. 1 - What is the difference between qualitative data...Ch. 1 - Classify the following as qualitative or...Ch. 1 - Classify each of the following statements as a...Ch. 1 - Give an example for each of the following terms:...Ch. 1 - Give an example of a homogeneous mixture and an...Ch. 1 - Give an example of an element and a compound. How...Ch. 1 - What is the number of known elements?Ch. 1 - Give the names of the elements represented by the...Ch. 1 - Give the chemical symbols for the following...Ch. 1 - Classify each of the following substances as an...Ch. 1 - Classify each of the following as an element, a...Ch. 1 - Identify each of the diagrams shown here as gas,...Ch. 1 - Explain how the distances between particles...Ch. 1 - Using examples, explain the difference between a...Ch. 1 - How does an intensive property differ from an...Ch. 1 - Do the following statements describe chemical or...Ch. 1 - Does each of the following describe a physical...Ch. 1 - Name the SI base units that are important in...Ch. 1 - Write the numbers represented by the following...Ch. 1 - What units do chemists normally use for density of...Ch. 1 - Describe the three temperature scales used in the...Ch. 1 - Bromine is a reddish-brown liquid. Calculate its...Ch. 1 - The density of methanol, a colorless organic...Ch. 1 - Convert the following temperatures to degrees...Ch. 1 - Prob. 1.26QPCh. 1 - Convert the following temperatures to kelvin: (a)...Ch. 1 - Convert the following temperatures to degrees...Ch. 1 - What is the advantage of using scientific notation...Ch. 1 - Define significant figure. Discuss the importance...Ch. 1 - Express the following numbers in scientific...Ch. 1 - Prob. 1.32QPCh. 1 - Express the answers to the following calculations...Ch. 1 - Express the answers to the following calculations...Ch. 1 - Prob. 1.35QPCh. 1 - How many significant figures are there in each of...Ch. 1 - Carry out the following operations as if they were...Ch. 1 - Carry out the following operations as if they were...Ch. 1 - Three students (A, B, and C) are asked to...Ch. 1 - Three apprentice tailors (X, Y, and Z) are...Ch. 1 - Carry out the following conversions: (a) 22.6 m to...Ch. 1 - Carry out the following conversions: (a) 242 lb to...Ch. 1 - The average speed of helium at 25C is 1255 m/s....Ch. 1 - How many seconds are there in a solar year (365.24...Ch. 1 - Prob. 1.45QPCh. 1 - A jogger runs a mile in 8.92 min. Calculate the...Ch. 1 - A 6.0-ft person weighs 168 lb. Express this...Ch. 1 - The speed limit on parts of the German autobahn...Ch. 1 - Prob. 1.49QPCh. 1 - Prob. 1.50QPCh. 1 - Prob. 1.51QPCh. 1 - Carry out the following conversions: (a) 70 kg,...Ch. 1 - Aluminum is a lightweight metal (density = 2.70...Ch. 1 - Ammonia gas is used as a refrigerant in...Ch. 1 - Prob. 1.55QPCh. 1 - Which of the following statements describe...Ch. 1 - Prob. 1.57QPCh. 1 - In determining the density of a rectangular metal...Ch. 1 - Calculate the mass of each of the following: (a) a...Ch. 1 - A cylindrical glass bottle 21.5 cm in length is...Ch. 1 - The following procedure was used to determine the...Ch. 1 - Prob. 1.62QPCh. 1 - A piece of silver (Ag) metal weighing 194.3 g is...Ch. 1 - Prob. 1.64QPCh. 1 - A lead sphere of diameter 48.6 cm has a mass of...Ch. 1 - Lithium is the least dense metal known (density:...Ch. 1 - Prob. 1.67QPCh. 1 - Vanillin (used to flavor vanilla ice cream and...Ch. 1 - At what temperature does the numerical reading on...Ch. 1 - Prob. 1.70QPCh. 1 - A resting adult requires about 240 mL of pure...Ch. 1 - (a) Referring to Problem 1.71, calculate the total...Ch. 1 - Three different 25.0-g samples of solid pellets...Ch. 1 - Prob. 1.74QPCh. 1 - Prob. 1.75QPCh. 1 - The surface area and average depth of the Pacific...Ch. 1 - The unit troy ounce is often used for precious...Ch. 1 - Prob. 1.78QPCh. 1 - Prob. 1.79QPCh. 1 - The natural abundances of elements in the human...Ch. 1 - The mens world record for running a mile outdoors...Ch. 1 - Prob. 1.82QPCh. 1 - Chalcopyrite, the principal ore of copper (Cu),...Ch. 1 - Prob. 1.84QPCh. 1 - Prob. 1.85QPCh. 1 - Measurements show that 1.0 g of iron (Fe) contains...Ch. 1 - The thin outer layer of Earth, called the crust,...Ch. 1 - Prob. 1.88QPCh. 1 - One gallon of gasoline in an automobiles engine...Ch. 1 - A sheet of aluminum (Al) foil has a total area of...Ch. 1 - Prob. 1.91QPCh. 1 - Chlorine is used to disinfect swimming pools. The...Ch. 1 - An aluminum cylinder is 10.0 cm in length and has...Ch. 1 - Prob. 1.94QPCh. 1 - Prob. 1.95QPCh. 1 - Prob. 1.96QPCh. 1 - A human brain weighs about 1 kg and contains about...Ch. 1 - Prob. 1.98QPCh. 1 - A bank teller is asked to assemble one-dollar sets...Ch. 1 - A graduated cylinder is filled to the 40.00-mL...Ch. 1 - A cobalt bar (density = 8.90 g/cm3) is shown here....Ch. 1 - Prob. 1.102QPCh. 1 - Prob. 1.103QPCh. 1 - Prob. 1.104QPCh. 1 - Tums is a popular remedy for acid indigestion. A...Ch. 1 - A 250-mL glass bottle was filled with 242 mL of...Ch. 1 - What is the mass of one mole of ants? (Useful...Ch. 1 - How much time (in years) does an So-year-old...Ch. 1 - Estimate the daily amount of water (in gallons)...Ch. 1 - Public bowling alleys generally stock bowling...Ch. 1 - Fusing nanofibers with diameters of 100 to 300 nm...Ch. 1 - Prob. 1.112QPCh. 1 - Estimate the total amount of ocean water in...Ch. 1 - Estimate the volume of blood in an adult in...Ch. 1 - Prob. 1.115QPCh. 1 - Estimate the distance (in miles) covered by an NBA...Ch. 1 - In water conservation, chemists spread a thin film...
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