August 2017 Chemistry Regents Questions 31-40 Question Preview (ID: 59770)

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Which electron configuration represents the electrons in an atom of calcium in an excited state?

a) 2-8-8

b) 2-8-8-2

c) 2-7-8-1

d) 2-7-8-3

Which numerical setup can be used to calculate the atomic mass of the element bromine?

a) (78.92 u)(50.69) + (80.92 u)(49.31)

b) (78.92 u)(49.31) + (80.92 u)(50.69)

c) (78.92 u)(49.31) + (80.92 u)(50.69)

d) (78.92 u)(0.4931) + (80.92 u)(0.5069)

These diagrams represent substances that have

a) the same molecular structure and the same physical properties

b) the same molecular structure and different physical properties

c) different molecular structures and the same physical properties

d) different molecular structures and different physical properties

What is the chemical formula of titanium(II) oxide?

a) TiO

b) Ti2O

c) TiO2

d) Ti2O3

Which equation shows conservation of mass and energy for a reaction at 101.3 kPa and 298 K?

a) 2H2(g) + O2(g) → 2H2O(g) + 483.6 kJ

b) 2H2(g) + O2(g) → 2H2O(ℓ) + 285.8 kJ

c) H2(g) + O2(g) → H2O(g) + 483.6 kJ

d) H2(g) + O2(g) → H2O(ℓ) + 285.8 kJ

Which two particle diagrams each represent a sample of one substance?

a) I and II

b) I and III

c) II and III

d) II and IV

According to Table G, which substance forms an unsaturated solution when 80. grams of the substance are stirred into 100. grams of H2O at 10.°C?

a) KNO3

b) KI

c) NH3

d) NaCl

What is the concentration of AgCl in an aqueous solution that contains 1.2 x 10^-3 gram of AgCl in 800. grams of the solution?

a) 1.2 ppm

b) 1.5 ppm

c) 7.2 ppm

d) 9.6 ppm

A sample of gas is in a rigid cylinder with a movable piston. The pressure of the gas is kept constant. If the Kelvin temperature of the gas is doubled, the volume of the gas is

a) halved

b) doubled

c) tripled

d) unchanged

What is the amount of heat required to completely melt a 200.-gram sample of H2O(s) at STP?

a) 334 J

b) 836 J

c) 66 800 J

d) 452 000 J

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