Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 7.2, Problem 7.3YT
Skill Building Coulombs
The SI unit of electric charge is the coulomb, C, which is equivalent to the charge of 6.242 × 1018 protons. Express amps and ohms in terms of the base SI units of J, C, and s. Perform dimensional analysis for Equation 7.5 to show that volts may be expressed as J/C.
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Exercise -1- (6pts)
Chemical Composition of Sand
Sand, which is used in making glass, is formed mainly of the compound silica (a compound formed between
silicon Si and oxygen O). Silicon is used also in computer chips. When mixed with steel, it makes the alloys
harder and resistant to corrosion while oxygen is used in chemical industry and medical treatment.
The documents below show some information about silicon and oxygen atoms.
nb of protons
nb of neutrons
Nuclear charge
Silicon atom
14
15
Oxygen atom
8+
Document 1
Document 2
1-Referring to document 1:
1.1- Indicate the number of electrons of silicon atom.
1.2- Determine the atomic number of silicon atom.
1.3- Calculate its mass number.
1.4- Write the atomic representation of silicon atom (Si).
2-Referring to document 2:
.1- Show that
atom
number Z of oxygen atom is 8.
2.2- Write its electronic configuration .
2.3- Identify its valence shell and valence electrons.
2.4- Write its Lewis dot symbol and deduce its valency.
3- Referring…
EXERCISE 4.1
A hydrogen atom, which has one electron, has a radius 0.7 x 10-10 m. The radius of its nucleus is about
1 x 1015 m. By what factor is the volume of this atom larger than the volume of its nucleus? Assume
that both the atom and its nucleus are spherical. The volume V of a sphere of radius r is given by V =
3
tr and r = 3.14.
To WUIK Out
reactant. Use the relationship:
mass of substance
number of moles =
mass of 1 mol of substance
or
volume of gas at s.t.p.
number of moles of gas =
22.4 dm3 mol-1
of moles of the unknown, and hence the mass or volume at s.t.p.
Worked example 4
On heating, potassium chlorate( omposes into potassium chloride and
oxygen:
2KCIO;(s) → 2KCI(s) + 30,(g)
9.8 g of KCIO3(s) are heated. Calculate:
a the mass of KCl(s) formed3B
b the mass and volume, at s.t.p., of O,(g) formed.
Chapter 7 Solutions
Chemistry In Context
Ch. 7.1 - Prob. 7.2YTCh. 7.2 - Skill Building Coulombs The SI unit of electric...Ch. 7.2 - Prob. 7.4YTCh. 7.4 - Prob. 7.5YTCh. 7.4 - Scientific Practices The Shift from NiCd to NiMH...Ch. 7.5 - Scientific Practices The Battery in Your Car Lets...Ch. 7.7 - Prob. 7.9YTCh. 7.8 - Prob. 7.10YTCh. 7.9 - Prob. 7.11YTCh. 7.9 - Prob. 7.12YT
Ch. 7.10 - Prob. 7.13YTCh. 7.10 - Prob. 7.14YTCh. 7.11 - Skill Building Metal Refining (Smelting) The...Ch. 7.11 - You Decide Could Metals Become Extinct? In 2015,...Ch. 7.11 - Prob. 7.17YTCh. 7 - You Decide The Baghdad Battery Alessandro Volta is...Ch. 7 - Prob. 1QCh. 7 - Prob. 2QCh. 7 - Which chemical species gets oxidized and which...Ch. 7 - What is the difference between a galvanic cell and...Ch. 7 - Two common units associated with electricity are...Ch. 7 - Consider the galvanic cell pictured. A coating of...Ch. 7 - Prob. 7QCh. 7 - a. How does the voltage from a tiny AAA alkaline...Ch. 7 - Identify the type of galvanic cell commonly used...Ch. 7 - The mercury battery has been used extensively in...Ch. 7 - Prob. 12QCh. 7 - During the conversion of O2(g) to H2O(l) in a fuel...Ch. 7 - How does the reaction between hydrogen and oxygen...Ch. 7 - This diagram represents the hydrogen fuel cell...Ch. 7 - What is a PEM fuel cell? How does it differ from...Ch. 7 - How do PEM fuel cells allow H2 and O2 to combine...Ch. 7 - In addition to hydrogen, methane also has been...Ch. 7 - Prob. 19QCh. 7 - Potassium and lithium both are reactive Group 1...Ch. 7 - What challenges keep hydrogen fuel cells from...Ch. 7 - Explain the concept of energy density of a battery...Ch. 7 - Describe how a normal AA battery stores and...Ch. 7 - Prob. 24QCh. 7 - What is the difference between an electrolytic...Ch. 7 - Provide some differences between a leadacid...Ch. 7 - Describe the importance of a separator in primary...Ch. 7 - The company ZPower is promoting its silverzinc...Ch. 7 - Prob. 29QCh. 7 - Prob. 30QCh. 7 - Describe some advantages and disadvantages of...Ch. 7 - You never need to plug in Toyotas gasolinebattery...Ch. 7 - Prob. 33QCh. 7 - Hydrogen is considered an environmentally friendly...Ch. 7 - Fuel cells were invented in 1839 but never...Ch. 7 - Hydrogen and methane both can react with oxygen in...Ch. 7 - Engineers have developed a prototype fuel cell...Ch. 7 - Prob. 38QCh. 7 - Describe some similarities and differences between...Ch. 7 - Prob. 40QCh. 7 - Prob. 41QCh. 7 - Prob. 42QCh. 7 - Small quantities of hydrogen gas can be prepared...Ch. 7 - Prob. 44QCh. 7 - Although Alessandro Volta is credited with the...Ch. 7 - Prob. 46QCh. 7 - Prob. 47QCh. 7 - What is the tragedy of the commons? How does this...Ch. 7 - How can the principles of green chemistry be...Ch. 7 - If all of todays technology presently based on...Ch. 7 - Consider these three sources of light: a candle, a...Ch. 7 - Prob. 52Q
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