SUPER QUIZ
Respond correctly!
ARE YOU READY?
QUESTION 1 OF 12
Determine the molecular mass of Aluminum sulfate, Al2(SO4)3
342.1 g/mol
150.1 g/mol
248.1 g/mol
RIGHT ANSWER!
The molecular mass of aluminum sulfate is 342.1 g/mol. Two aluminum atoms (2 × 26.98), three sulfur atoms (3 × 32.06), and twelve oxygen atoms (12 × 16.00).
NEW SUPERPOWER!
NEXT
QUESTION 2 OF 12
What amount of energy is contained in 2.0 moles of photons of blue light with a wavelength of 475 nm?
1.98 * 104 J
3.64 * 106 J
5.04 * 105 J
RIGHTANSWER!
first, use the equation that says energy is equal to (h*c)/wavelength. this gives the energy per a single photon. then, multiply by avogadro's number to get the amount of energy in one mol of photons. finally, multiply by 2 since there are 2 mols in this problem.
NEW SUPERPOWER!
NEXT
QUESTION 3 OF 12
Which species has the following ground-state electron configuration: [Ar]3d5
Fe+
Mn2+
Cr2+
RIGHTANSWER!
The given electron configuration represents a species with 23 electrons. 18 from argon, and 5 extra. Neutral mn has 25 electrons, but in this problem it has 23 since it has a 2+ charge, meaning it has lost 2 electrons.
NEW SUPERPOWER!
NEXT
QUESTION 4 OF 12
Determine the empirical formula for a compund that is found to contain 0.80g S and 1.60g O.
So2
SO3
SO4
RIGHTANSWER!
First use atomic masses to convert from the given masses to mols. you should get 0.02496 mols of S and 0.100 mols of o. then, divide them both by the larger numer (and multily if needed - not in this problem) to reach the simplest whole number ratio.
NEW SUPERPOWER!
NEXT
QUESTION 5 OF 12
Whats the Molecular geometry for PCL5?
Trigonal Bipyramidal
Trigonal PLanar
Tetrahedral
RIGHTANSWER!
This is correct because P forms five single bonds with five Cl atoms, using all 5 of its valence electrons (no lone pairs on P). So the electron geometry has 5 bonding pairs making both the molecular geometry and shape trigonal bipyramidal.
NEW SUPERPOWER!
NEXT
QUESTION 6 OF 12
Consider the molecule c2h4(ethene). Draw the lewis stricture and determine the amount of sigma and pi bonds.
3 sigma bonds, 3 pi bonds
5 sigma bonds, 1 pi bond
6 sigma bonds, 0 pi bonds
RIGHT ANSWER!
This is correct because Each carbon forms 3 sigma bonds (2 with H, 1 with C) and has 1 pi bond (from the double bond). it also has Hybridization: sp². therefore, Total 5 sigma bonds (4 C–H + 1 C–C) and Total 1 pi bond (from the C=C double bond) is correct.
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QUESTION 7 of 12
If 5.00 g of nitrogen gas react with 2.00 g of hydrogen gas, determine the theoretical yeild. n2(g) + 3H2(g) -> 2NH3(g)
5.22 grams
7.09 grams
6.08 grams
RIGHTANSWER!
This is correct because 1 N2→2NH3 n(NH3) = 2 × 0.178 = 0.357 mol Mass NH3 = 0.357 × 7.031 = 6.08 g NH3 = 0.357 × 17.031 = 6.08 g
NEW SUPERPOWER!
NEXT
QUESTION 8 of 12
Which of the following liquids has the strongest intermolecular forces?
ch3ch2ch3 (propane)
H2O (water)
ch30h (methanol)
RIGHTANSWER!
This is correct because Water has the strongest intermolecular forces because it can form two hydrogen bonds per molecule due to its highly polar O–H bonds and bent molecular geometry.
NEW SUPERPOWER!
NEXT
QUESTION 9 OF 12
Calculate the PV work done when a balloon, which has an initial volume of 750.0 mL, deflates to a volume of 25.0 mL. Assume the pressure in the room is 1.10 atm. (1 L·atm = 101 J)
0.81 J
81 J
-81 J
RIGHT ANSWER!
Use the work formula: w=-p(change of v) w = -(1.10atm)(0.025L-0.750l) W = 0.7975 L*atm convert to j by multiplying by 101
NEW SUPERPOWER!
NEXT
QUESTION 10 of 12
What is the volume at STP of 0.0180 mol of oxygen gas collected from a reaction?
40.3 ml
0.0403 L
403 mL
RIGHTANSWER!
with ideal gasses you can multiply the amount of mols by 22.4 to get the volume in l. make sure to pay attention to units when answering the question! in this question, the answer requires you to convert to ml instead of leaving the answer in l.
NEW SUPERPOWER!
NEXT
QUESTION 11 of 12
Solid aluminum reacts with aqueous copper(II) sulfate according to the balanced equation: A student places 5.40 g of Al into a solution containing 24.0 g of CuSO₄. Which reactant is the limiting reactant?
CuSo4
Al
Al2(So4)3
RIGHT ANSWER!
First convert grams to moles getting 0.200 mol Al and 0.150 mol cuso4. Use the ratio from the balanced equation to use which is 2/3 - using this we divide 0.200/0.150 to get 1.33. We have more Al than per cuso4 meaning we will run out of cuso4 faster making this the limiting reactant and al is excess.
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NEXT
QUESTION 12 of 12
A student dissolves equal concentrations (0.10 M) of HCl, HF, and CH₃COOH in separate beakers. After the solutions reach equilibrium, the student measures the electrical conductivity of each. Which solution will have the highest electrical conductivity?
Hcl
HF
CH₃COOH (acetic acid)
RIGHTANSWER!
Strong acids fully dissociate → many ions → high conductivity HCl is a strong acid meaning it dissaciates 100% producig the highest concentration of ions and is the best conductor.
NEW SUPERPOWER!
NEXT
YOU HAVE GOT ALL THE POWERS!
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Transcript
SUPER QUIZ
Respond correctly!
ARE YOU READY?
QUESTION 1 OF 12
Determine the molecular mass of Aluminum sulfate, Al2(SO4)3
342.1 g/mol
150.1 g/mol
248.1 g/mol
RIGHT ANSWER!
The molecular mass of aluminum sulfate is 342.1 g/mol. Two aluminum atoms (2 × 26.98), three sulfur atoms (3 × 32.06), and twelve oxygen atoms (12 × 16.00).
NEW SUPERPOWER!
NEXT
QUESTION 2 OF 12
What amount of energy is contained in 2.0 moles of photons of blue light with a wavelength of 475 nm?
1.98 * 104 J
3.64 * 106 J
5.04 * 105 J
RIGHTANSWER!
first, use the equation that says energy is equal to (h*c)/wavelength. this gives the energy per a single photon. then, multiply by avogadro's number to get the amount of energy in one mol of photons. finally, multiply by 2 since there are 2 mols in this problem.
NEW SUPERPOWER!
NEXT
QUESTION 3 OF 12
Which species has the following ground-state electron configuration: [Ar]3d5
Fe+
Mn2+
Cr2+
RIGHTANSWER!
The given electron configuration represents a species with 23 electrons. 18 from argon, and 5 extra. Neutral mn has 25 electrons, but in this problem it has 23 since it has a 2+ charge, meaning it has lost 2 electrons.
NEW SUPERPOWER!
NEXT
QUESTION 4 OF 12
Determine the empirical formula for a compund that is found to contain 0.80g S and 1.60g O.
So2
SO3
SO4
RIGHTANSWER!
First use atomic masses to convert from the given masses to mols. you should get 0.02496 mols of S and 0.100 mols of o. then, divide them both by the larger numer (and multily if needed - not in this problem) to reach the simplest whole number ratio.
NEW SUPERPOWER!
NEXT
QUESTION 5 OF 12
Whats the Molecular geometry for PCL5?
Trigonal Bipyramidal
Trigonal PLanar
Tetrahedral
RIGHTANSWER!
This is correct because P forms five single bonds with five Cl atoms, using all 5 of its valence electrons (no lone pairs on P). So the electron geometry has 5 bonding pairs making both the molecular geometry and shape trigonal bipyramidal.
NEW SUPERPOWER!
NEXT
QUESTION 6 OF 12
Consider the molecule c2h4(ethene). Draw the lewis stricture and determine the amount of sigma and pi bonds.
3 sigma bonds, 3 pi bonds
5 sigma bonds, 1 pi bond
6 sigma bonds, 0 pi bonds
RIGHT ANSWER!
This is correct because Each carbon forms 3 sigma bonds (2 with H, 1 with C) and has 1 pi bond (from the double bond). it also has Hybridization: sp². therefore, Total 5 sigma bonds (4 C–H + 1 C–C) and Total 1 pi bond (from the C=C double bond) is correct.
NEW SUPERPOWER!
NEXT
QUESTION 7 of 12
If 5.00 g of nitrogen gas react with 2.00 g of hydrogen gas, determine the theoretical yeild. n2(g) + 3H2(g) -> 2NH3(g)
5.22 grams
7.09 grams
6.08 grams
RIGHTANSWER!
This is correct because 1 N2→2NH3 n(NH3) = 2 × 0.178 = 0.357 mol Mass NH3 = 0.357 × 7.031 = 6.08 g NH3 = 0.357 × 17.031 = 6.08 g
NEW SUPERPOWER!
NEXT
QUESTION 8 of 12
Which of the following liquids has the strongest intermolecular forces?
ch3ch2ch3 (propane)
H2O (water)
ch30h (methanol)
RIGHTANSWER!
This is correct because Water has the strongest intermolecular forces because it can form two hydrogen bonds per molecule due to its highly polar O–H bonds and bent molecular geometry.
NEW SUPERPOWER!
NEXT
QUESTION 9 OF 12
Calculate the PV work done when a balloon, which has an initial volume of 750.0 mL, deflates to a volume of 25.0 mL. Assume the pressure in the room is 1.10 atm. (1 L·atm = 101 J)
0.81 J
81 J
-81 J
RIGHT ANSWER!
Use the work formula: w=-p(change of v) w = -(1.10atm)(0.025L-0.750l) W = 0.7975 L*atm convert to j by multiplying by 101
NEW SUPERPOWER!
NEXT
QUESTION 10 of 12
What is the volume at STP of 0.0180 mol of oxygen gas collected from a reaction?
40.3 ml
0.0403 L
403 mL
RIGHTANSWER!
with ideal gasses you can multiply the amount of mols by 22.4 to get the volume in l. make sure to pay attention to units when answering the question! in this question, the answer requires you to convert to ml instead of leaving the answer in l.
NEW SUPERPOWER!
NEXT
QUESTION 11 of 12
Solid aluminum reacts with aqueous copper(II) sulfate according to the balanced equation: A student places 5.40 g of Al into a solution containing 24.0 g of CuSO₄. Which reactant is the limiting reactant?
CuSo4
Al
Al2(So4)3
RIGHT ANSWER!
First convert grams to moles getting 0.200 mol Al and 0.150 mol cuso4. Use the ratio from the balanced equation to use which is 2/3 - using this we divide 0.200/0.150 to get 1.33. We have more Al than per cuso4 meaning we will run out of cuso4 faster making this the limiting reactant and al is excess.
NEW SUPERPOWER!
NEXT
QUESTION 12 of 12
A student dissolves equal concentrations (0.10 M) of HCl, HF, and CH₃COOH in separate beakers. After the solutions reach equilibrium, the student measures the electrical conductivity of each. Which solution will have the highest electrical conductivity?
Hcl
HF
CH₃COOH (acetic acid)
RIGHTANSWER!
Strong acids fully dissociate → many ions → high conductivity HCl is a strong acid meaning it dissaciates 100% producig the highest concentration of ions and is the best conductor.
NEW SUPERPOWER!
NEXT
YOU HAVE GOT ALL THE POWERS!
CONGRATULATIONS!
BACK?
(choose your contact buttons)
WRONGANSWER!
TRY AGAIN?