June 2022 Chemistry Regents Questions 31-40 Question Preview (ID: 59694)

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

a) 2-8-5

b) 2-8-6

c) 2-7-6

d) 2-7-4

A 26.7-gram sample of which element has a volume of 3.00 cubic centimeters at room temperature?

a) Cr

b) Cd

c) Nb

d) Ni

Which element is a nonmetal and solid at STP?

a) lead

b) nitrogen

c) sodium

d) sulfur

What is the molecular formula for CH3CH2COOCH3?

a) C2H4O

b) C2H4O2

c) C4H8O

d) C4H8O2

A substance conducts electricity in the liquid phase but not in the solid phase. This substance can be classified as

a) covalent

b) ionic

c) metallic

d) molecular

A student measured the melting point of a sample of gallium to be 309 K. Based on Table S, which numerical setup can be used to calculate the student’s percent error?

a) (309 K – 303 K) / 303 K x 100

b) (309 K – 303 K) / 309 K x 100

c) 303 K / 309 K x 100

d) 309 K / 303 K x 100

Which chemical bond is most polar?

a) a O–H bond in H2O

b) a S–H bond in H2S

c) a Se–H bond in H2Se

d) a Te–H bond in H2Te

What is the amount of heat required to melt 43 grams of solid magnesium oxide at its melting point? The heat of fusion is 1.9 x 10^3 J/g.

a) 2.3 x 10^-2 J

b) 4.4 x 10^1 J

c) 8.2 x 10^4 J

d) 3.4 x 10^5 J

This apparatus is used for which process?

a) filtration

b) distillation

c) chromatography

d) electrolysis

Solid aluminum has a specific heat capacity of 0.90 J/g•K. How many joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K?

a) 22 J

b) 45 J

c) 1100 J

d) 1200 J

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