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AP Chemistry Questions and Answers

• What mass of carbon dioxide is produced if 54.0g of water is produced? In a combustion reaction, 46.0g of ethanol reacts with 96.0g of oxygen to produce water and carbon dioxide.
What mass of carbon dioxide is produced if 54.0g of water is produced? In a combustion reaction, 46.0g of ethanol reacts with 96.0g of oxygen to produce water and carbon dioxide.
The answer to this is 88.0 g. The amount of ethanol should be added to the amount of oxygen. This means that 46.0 grams added to 96.0 grams of oxygen will be 142 grams. From 142 grams, the 54.0 grams of water that has been produced will then be subtracted from the total. The total will be 88.0 grams. The same solution can be done when a similar equation is given even when the numbers are changed. Carbon dioxide is actually needed in the environment by plants in order to produce oxygen that people need. The constant production of carbon dioxide plus a substantial amount of plants will ensure that people will have enough oxygen to keep them alive.

• Which of the following has the correct state lable in the equation?[(aq) or (s(= means yields)do not trust the state lables on the pre net ionic equations, they may try to fool you!
Which of the following has the correct state lable in the equation?[(aq) or (s(= means yields)do not trust the state lables on the pre net ionic equations, they may try to fool you!
My chemistry book states that SO4 IS, in fact, insoluble for Ag+. Thus, it WOULD form that Ag2SO4 (s) that is present in the first equation. So both the first and second answers are correct, because insoluble salts always form a precipitate. I disagree with this answer.

• What are the soluble polyatomic ions for all the given elements?
What are the soluble polyatomic ions for all the given elements?
1. C2H3O2 (-)2. NO3 (-)3. ClO3 (-)4. NH4(+)5. ClO4 (-)

• What would be the correct answer (with significant figures) for the following problem? 21-13.8 = ?
What would be the correct answer (with significant figures) for the following problem? 21-13.8 = ?
7Since the limiting term has no decimal places, the answer will mirror that fact. This makes your answer have NO decimal places, leaving it to be displayed simply as 7.

• Which of the following polyatomic ions that contain oxygen are soluble?
Which of the following polyatomic ions that contain oxygen are soluble?
1. NO3-2. ClO3-3. ClO4-4. C2H3O2-

• Insoluble? K2CO3
Insoluble? K2CO3
The cataion is a alkali metal. All alkali metals are soluble. The answer should be true.

• Always Soluble?
Always Soluble?
1. Alkali metal ions: Li+, Na+, K+, Rb+, Cs+2. Ammonium: NH4+HINT: all of the polyatomic ions that are always soluble have a charge of negative 1 except for the ammonium ion which has a charge of positive 1.

• What is true regarding substance whose triple point occurs at 222 K and 3.93 atm?
What is true regarding substance whose triple point occurs at 222 K and 3.93 atm?
Will sublime rather than melt at STP.

• Is it true or false? Exceptions for I (-):Ag(+)Pb(2+)Hg2(2+)
Is it true or false? Exceptions for I (-):Ag(+)Pb(2+)Hg2(2+)
TrueHINT: the exceptions are the same for Cl-, Br-, and I- (all are halogens, missing F)

• Which statement is not correct about the trp operon?
Which statement is not correct about the trp operon?
Tryptophan binds to the repressor protein and inactivates it.

• Insoluble?F-
Insoluble?F-
1. False

• Which statement is NOT correct about the lac operon?
Which statement is NOT correct about the lac operon?
It regulates the production of a series of five enzymes.