Science UIL Chemistry Questions District 2020

50 g of solid barium bromate is added to 2.0 L of water, and 31 g of the solid dissolves. If an additional 2.0 L of water is added to the solution, how much more barium bromate will dissolve?

• 0 g

• 9.5 g

• 19 g

• 31 g

• 50 g

For a 3.0 L sample of sulfur dioxide gas at 40.0^oC and 1.5 atm pressure, how would you calculate the mass of SO₂ in the sample?

• mass = (0.082)(40)(64.07)/(3.0)(1.5)

• mass = (0.082)(313)/(3.0)(1.5)(64.07)

• mass = (3.0)(1.5)(64.07)/(8.314)(40)

• mass = (3.0)(1.5)/(0.082)(40)(64.07)

• mass = (64.07)(1.5)(3.0)/(313)(0.082)

What is the lowest whole-number coefficient on H₂O in the balanced equation for the combustion of ethanol?

• 1

• 2

• 3

• 4

• 5

What kind of experiment is represented by the graph below?

• Titration of a strong acid with a strong base.

• Titration of a weak acid with a strong base.

• Titration of a strong base with a strong acid.

• Titration of a weak base with a strong acid.

• Titration of a weak acid with a strong acid.

Which of these compounds in the liquid state would you expect to have the highest surface tension?

• CH₄

• C₃H₆

• C₃H₈

• CH₃OCH₃

• C₂H₅OH

Estimate the ΔH for this reaction using the bond energies provided on the data page.

• -1248 kJ/mol

• 816 kJ/mol

• -1594 kJ/mol

• 2309 kJ/mol

• -2309 kJ/mol

Tags

NGSS.HS-PS1-4

What is the mass of three moles of sodium hydrogen phosphate dihydrate?

• 178.00 g

• 155.01 g

• 534.00 g

• 465.03 g

• 136.99 g

• The number of moles of NO₂ is twice the number of moles of N₂O₄.

• The concentrations of N₂O₄ and NO₂ are equal.

• The pressure of the N₂O₄ gas is twice the pressure of the NO₂ gas.

• The concentrations of N₂O₄ and NO₂ are constant.

• The rate of the forward reaction is double the rate of the reverse reaction.

What is the total mass of solute in 1.00 kg of solution that has a concentration of 7.5 ppm?

• 7.5 g

• 0.75 g

• 75 mg

• 7.5 mg

• 750 μg

Two aqueous reactants are mixed in a flask with a balloon over the top and the following change is observed.

What are the signs on q and w for the system?

• q > 0, w > 0

• q > 0, w < 0

• q < 0, w > 0

• q < 0, w < 0

• q < 0, w = 0

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4