January 2024 Chemistry Regents Questions 31-40 Question Preview (ID: 62918)

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Which elements are present in the mixture?

a) L and G

b) L and J

c) E and G

d) E and J

Which particle model diagram represents a noble gas at STP?

a) 1

b) 2

c) 3

d) 4

A student determines the density of a copper sample at room temperature to be 9.46 g/cm3. Based on Table S, what is the student’s percent error in determining the density of copper?

a) 0.50%

b) 5.0%

c) 5.3%

d) 5.6%

What is the gram-formula mass of Mg(NO3)2?

a) 86 g/mol

b) 134 g/mol

c) 148 g/mol

d) 172 g/mol

Compared to a rubidium atom, a Rb+ ion has

a) one more electron and a larger radius

b) one more electron and a smaller radius

c) one fewer electron and a larger radius

d) one fewer electron and a smaller radius

Which ion in the ground state has the same electron configuration as an atom of neon in the ground state?

a) K+

b) Li+

c) F-

d) Cl-

Which substance can not be broken down by a chemical change?

a) barium

b) butanal

c) methane

d) methanol

The difference in which property allows the separation of a sample of water and sand by using filter paper and a funnel?

a) boiling point

b) melting point

c) particle size

d) sample volume

According to Table F, which compound has a very low solubility in water?

a) sodium carbonate

b) sodium sulfide

c) calcium hydroxide

d) calcium phosphate

What is the molarity of a NaOH solution containing 0.125 mole of NaOH in 0.200 L of water?

a) 0.025 M

b) 0.250 M

c) 0.625 M

d) 1.60 M

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