January 2019 Chemistry Regents Questions 31-40 Question Preview (ID: 59735)

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The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and

a) the same number of electrons per atom

b) the same number of neutrons per atom

c) a different number of electrons per atom

d) a different number of neutrons per atom

Diamond and graphite have different properties because they have different

a) crystal structures

b) electronegativities

c) numbers of protons per atom

d) numbers of valence electrons per atom

This reaction is classified as a

a) synthesis reaction

b) decomposition reaction

c) single replacement reaction

d) double replacement reaction

What is the formula for iron(II) oxide?

a) FeO

b) FeO2

c) Fe2O

d) Fe2O3

How many moles of KClO3 must completely react to produce 6 moles of O2?

a) 1 mole

b) 2 mole

c) 6 mole

d) 4 mole

What is the number of moles of CO2 in a 220.-gram sample of CO2 (gram-formula mass = 44 g/mol)?

a) 0.20 mol

b) 5.0 mol

c) 15 mol

d) 44 mol

A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. Which numerical setup can be used to calculate the percent by mass of KNO3 in this solution?

a) (25g/175g)x100

b) (25g/200g)x100

c) (25g/225g)x100

d) (200g/225g)x100

What is the molarity of 0.50 liter of an aqueous solution that contains 0.20 mole of NaOH (gram-formula mass = 40. g/mol)?

a) 0.10 M

b) 0.20 M

c) 2.5 M

d) 0.40 M

Which statement describes a property of ethanol after being separated from the mixture?

a) Ethanol is nonflammable.

b) Ethanol has a melting point of 0.°C.

c) Ethanol has a density of 0.80 g/cm^3 at STP

d) Ethanol has a boiling point of 89°C at standard pressure.

A rigid cylinder with a movable piston contains a sample of hydrogen gas. At 330. K, this sample has a pressure of 150. kPa and a volume of 3.50 L. What is the volume of this sample at STP?

a) 0.233 L

b) 1.96 L

c) 4.29 L

d) 6.26 L

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