1. Why do you think we avoid writing the minus sign (-) in chemical equations? 2. What does CO3²- have to do with ocean acidification? Explain the chemical reactions completely. 3. One of the harmful oxidants in the body is the neutral OH• molecule. It has 7 total valence electrons, and unlike the OH- ion, it has no charge. Draw the Lewis structure of a regular OH- ion, then draw the Lewis structure of OH• and use this to show why OH• has very high energy, and a high tendency to oxidize the biomolecules inside our cells. (Recall what you learned from modules 2 and 3.) 4. If I weigh 40 kg, what is my molar mass? In other words, if we made trillions and trillions of my clones to make 1 mole of me, what would be our mass all together? Show your solution with units. 5. When coal is burned, sulfur impurities in the coal react with oxygen gas to form sulfur trioxide:

Chemistry
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Chapter8: Bonding: General Concepts
Section: Chapter Questions
Problem 136AE: Write Lewis structures for CO32, HCO3, and H2CO3. When acid is added to an aqueous solution...
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1. Why do you think we avoid writing the minus sign (-) in chemical equations?
2. What does CO3?- have to do with ocean acidification? Explain the chemical reactions
completely.
3. One of the harmful oxidants in the body is the neutral OH• molecule. It has 7 total valence
electrons, and unlike the OH- ion, it has no charge. Draw the Lewis structure of a regular OH-
ion, then draw the Lewis structure of OH• and use this to show why OH• has very high
energy, and a high tendency to oxidize the biomolecules inside our cells. (Recall what you
learned from modules 2 and 3.)
4. If I weigh 40 kg, what is my molar mass? In other words, if we made trillions and trillions of my
clones to make 1 mole of me, what would be our mass all together? Show your solution with
units.
5. When coal is burned, sulfur impurities in the coal react with oxygen gas to form sulfur trioxide:
S+ 02 → S03
a.
Did oxidation occur? Explain.
b. Balance the equation.
c. Translate the equation into a sentence by filling in the blanks below:
of oxygen gas to form
of sulfur trioxide.
moles of sulfur react with
d. The sentence in letter (c) tells us how many moles of SO3 are produced from a certain
number of S. You can now use it to make a conversion factor between moles of S and
moles of SO3. Fill in the blanks below:
moles S=_moles SO3
e. A coal plant burns about 455,000 moles of S per day. How many moles of SO3 does this
form*? Use simple dimensional analysis and your conversion factor from letter (d).
f. The molar mass of SOa is 86.06 g/mol. Using simple dimensional analysis, convert your
answer from letter (e) into grams, to estimate the mass of SOs produced by each coal
plant per day.
Transcribed Image Text:1. Why do you think we avoid writing the minus sign (-) in chemical equations? 2. What does CO3?- have to do with ocean acidification? Explain the chemical reactions completely. 3. One of the harmful oxidants in the body is the neutral OH• molecule. It has 7 total valence electrons, and unlike the OH- ion, it has no charge. Draw the Lewis structure of a regular OH- ion, then draw the Lewis structure of OH• and use this to show why OH• has very high energy, and a high tendency to oxidize the biomolecules inside our cells. (Recall what you learned from modules 2 and 3.) 4. If I weigh 40 kg, what is my molar mass? In other words, if we made trillions and trillions of my clones to make 1 mole of me, what would be our mass all together? Show your solution with units. 5. When coal is burned, sulfur impurities in the coal react with oxygen gas to form sulfur trioxide: S+ 02 → S03 a. Did oxidation occur? Explain. b. Balance the equation. c. Translate the equation into a sentence by filling in the blanks below: of oxygen gas to form of sulfur trioxide. moles of sulfur react with d. The sentence in letter (c) tells us how many moles of SO3 are produced from a certain number of S. You can now use it to make a conversion factor between moles of S and moles of SO3. Fill in the blanks below: moles S=_moles SO3 e. A coal plant burns about 455,000 moles of S per day. How many moles of SO3 does this form*? Use simple dimensional analysis and your conversion factor from letter (d). f. The molar mass of SOa is 86.06 g/mol. Using simple dimensional analysis, convert your answer from letter (e) into grams, to estimate the mass of SOs produced by each coal plant per day.
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