January 2020 Chemistry Regents Questions 31-40 Question Preview (ID: 59701)

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Which equation represents a single replacement reaction?

a) 2Al(s) + 3Cl2(g) → 2AlCl3(s)

b) 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)

c) 2AlCl3(s) → 2Al(s) + 3Cl2(g)

d) AlCl3(aq) + 3KOH(aq) → Al(OH)3(s) + 3KCl(aq)

Which equation represents conservation of charge?

a) I- + 2e- → I2

b) 2I- → I2 + 2e-

c) Br2 → 2Br- + 2e-

d) Br + 2e- → Br-

A measured value for the atomic radius of platinum atoms was determined to be 143 picometers. Based on Table S, what is the percent error of this measured value?

a) 0.10%

b) 9.1%

c) 10%

d) 13%

What is the chemical formula for sodium oxalate?

a) NaO

b) Na2O

c) NaC2O4

d) Na2C2O4

What is the molecular formula for this compound?

a) CH

b) CH2

c) CH3

d) C3H6

Graphite and diamond are both solid forms of the element carbon. Which statement explains the different properties of these two forms of carbon?

a) Diamond has ionic bonding and graphite has metallic bonding.

b) Diamond has metallic bonding and graphite has ionic bonding.

c) Diamond has a different crystal structure from graphite.

d) Diamond has carbon atoms with more valence electrons than graphite.

What is the number of valence electrons in a nitrogen atom in the ground state?

a) 5

b) 2

c) 7

d) 14

Which electron configuration could represent the electrons in a sodium atom in an excited state?

a) 2-8

b) 2-8-1

c) 2-7-1

d) 2-7-2

Which atom has a mass of 12 u?

a) A

b) E

c) G

d) J

The bond between which two atoms is most polar?

a) C–O

b) F–F

c) H–O

d) N–H

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