638 Answered Questions for the topic AP chemistry

Ap Chemistry Chemistry

10/22/18

Calculating ΔH°
Calculate ΔH° for the following reactionZn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
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Ap Chemistry

10/19/18

Finding the empirical formula of an unknown metal chloride using gravimetric analysis
Balanced Equation: AgNo3 (aq) + *MCl (s) —> AgCl (s) + MNO3 (aq)*”M”stands for the unknown metalMass of filter paper: 1.140 gramsMass of precipitate and filter paper: 1.2999 gramsWhat is the... more
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Ap Chemistry Chemistry

10/17/18

magnesium ribbon
True or falseIf I have excess magnesium ribbon at the end of the reaction, I don't need to do a titration because I can assume that HCl was completely consumed.
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Ap Chemistry Chemistry

10/14/18

coffee cup calorimetry
1) In this virtual lab, you will use coffee cup calorimetry to determine the specific heat, c, of a metal. Imagine that, in lab, you record the mass of a piece of metal, mmetal, as m(metal) =45.00... more
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Ap Chemistry Chemistry

10/12/18

ΔHrxn reactions
Given these reactions,X(s) +1/2 O2(g) --> XO(s)ΔH=-539.5 kJXCO3(s) --> XO(s)+CO2(g)ΔH=+266.3 kJwhat is ΔHrxn for this reaction?X(s)+1/2 O2(g)+CO2(g) --> XCO3(s)
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Ap Chemistry Chemistry

09/29/18

Gas mixtures
A gas mixture is made by combining 7.2g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 17.07L. What is the molar mass of the unknown gas in g/mol, and... more
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Ap Chemistry Chemistry

09/29/18

Hydrochloric Acid
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. What volume of H2(g) is produced when 6.50 g of Al(s) reacts at STP?
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Ap Chemistry Moles Beer's Law

09/11/18

Molarity Written Response
Angelica made 100mL of a 3.5M salt solution. She wanted to dilute this solution to make 100mL of a 2.1M solution. She calculated that she needed 60mL of her stock solution. She added the 60mL to... more
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09/08/18

Hydrchloric acids
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.  CaCO3 + 2HCl = CaCl2 (aq) + H2O + CO2 A.)How many grams of calcium chloride will be... more
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09/07/18

Unknown compound combustion
An unknown compound contains only C, H, and O. Combustion of 6.10 g of this compound produced 14.4 g of CO₂ and 3.92 g of H₂O. What is the empirical formula of the unknown compound?
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Ap Chemistry

07/25/18

What is the density of the solid object?
A certain liquid has a density of 0.79355 g/mL. A solid object with a mass of 43.51 grams is placed in a sample of the liquid (the solid is insoluble in the liquid). The total volume of the solid... more
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Ap Chemistry

07/25/18

How many moles of sulfur atoms are present in 830 milligrams of allicin?
The compound responsible for the smell of garlic is called allicin. By mass, allicin is composed of 44.4% carbon, 6.2% hydrogen, 9.9% oxygen, and 39.5% sulfur. The molar mass of allicin is 162 g/mol.
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Ap Chemistry

07/25/18

What is the percent abundance of the heaviest isotope?
A newly discovered element has an average atomic mass of 552.6209 amu. The element is found to have three isotopes. The first isotope has a mass of 551.1 amu and an abundance of 37.55 %. The second... more
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Ap Chemistry

07/24/18

how Many grams of element z
137.34 grams of element X reacts with 67.41 grams of element Z to form a compound. How many grams of the same compound could be produced using 55.1 grams of element X with excess element Z?
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Ap Chemistry

07/24/18

What is the average atomic mass of this element
Problems SetB » SummerB_08A newly discovered element is found to have four isotopes. The first isotope has a mass of 628.7 amu and a percent abundance of 24.21 %. The second isotope has a mass of... more
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Ap Chemistry

07/24/18

What is Percent Yeild of reaction
0.428 liters of hydrogen gas was reacted with excess fluorine gas to produce hydrogen fluoride. Given that the density of the hydrogen gas is 0.082 g/L, what was the percent yield of the reaction... more
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Ap Chemistry

07/24/18

A sample of glucose, C6H12O6, contains 4.5 x 1018 carbon atoms. If the sample has a total volume of 745 mL, what is the molarity of the glucose sample?
moles problem
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Ap Chemistry

07/24/18

What would be the total weight, in kilograms, of exactly 0.3 mole of people if the average weight of a person is 73,000 grams?
Weight problem
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Ap Chemistry

07/23/18

How many moles of ammonium ions are in 51 grams of ammonium carbonate?
Moles problem
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Ap Chemistry

07/23/18

A new element, X, is discovered. This element forms a compound XF4 in which the percent by mass of fluorine is 16.1 %. What is the atomic mass of X, in amu?
AMU problem 
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Ap Chemistry

07/23/18

A sample contains 0.0815 mg of testosterone, C19H28O2. How many moles of carbon atoms are in the sample?
Moles problem
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Ap Chemistry

07/11/18

Ammonia can be produced by the reaction of nitrogen and hydrogen. What is the maximum mass of ammonia that can be produced from a mixture of 33.1 grams nitrogen
Mass problem
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Ap Chemistry

07/11/18

A particular ion of a newly discovered element has a charge of -1, and contains 573 neutrons and 501 electrons. What would be the mass number
mass number problem
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Ap Chemistry

07/03/18

if the proton were 10 cm in diameter. . . the size of an orange, how big would everything be?
actual size of a proton is 10 to the -15 m
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Ap Chemistry

07/03/18

the size of the atom is due to the?
what in the atom creates the size of it
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