June 2023 Chemistry Regents Questions 41-50 Question Preview (ID: 62059)

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Which compound is less soluble in water as the temperature increases from 0°C to 100°C?

a) KNO3

b) NH3

c) KClO3

d) NH4Cl

How many moles of KI are needed to make 0.50 L of a 0.20 M aqueous solution?

a) 0.10 mol

b) 0.25 mol

c) 0.40 mol

d) 0.70 mol

A solution is prepared using 9.80 grams of NaHCO3 in enough water to make 1500. grams of total solution. What is the concentration of the solution expressed in parts per million?

a) 6.49 x 10^-3 ppm

b) 6.53 x 10^-3 ppm

c) 6.49x 10^3 ppm

d) 6.53 x 10^3 ppm

What can be concluded from the diagram?

a) The reaction is endothermic, and the heat of reaction is -200. kJ.

b) The reaction is endothermic, and the heat of reaction is +200. kJ.

c) The reaction is exothermic, and the heat of reaction is -200. kJ.

d) The reaction is exothermic, and the heat of reaction is +200. kJ.

What is a chemical name of this compound?

a) 1,1-dibromopentane

b) 2,2-dibromopentane

c) 1,2-dibromopentane

d) 4,5-dibromopentane

Which process is represented by this diagram?

a) chromatography

b) distillation

c) electrolysis

d) polymerization

Which aqueous solution has the greatest ability to conduct an electric current?

a) 0.10 M NaCl(aq)

b) 0.010 M NaCl(aq)

c) 0.10 M C6H12O6 (aq)

d) 0.010 M C6H12O6 (aq)

What fraction of an original sample of I(131) remains unchanged after 24.063 days?

a) 1/8

b) 1/2

c) 1/3

d) 1/4

Which type of reaction is represented by the equation?

a) nuclear fission

b) nuclear fusion

c) combustion

d) substitution

What is the amount of mass converted to energy as a result of the reaction between the two reactant nuclei?

a) 0.0239 u

b) 4.0265 u

c) 8.0052 u

d) 16.0343 u

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