GCU CHEMISTRY 113 QUIZ 1 NEWEST ACTUAL

GCU CHEMISTRY 113 (QUIZ 1) NEWEST ACTUAL /

QUESTIONS WITH CORRECT ANSWERS VERIFIED/GRADED A+

A - ---Answers---How many Pop TartsTM are needed to convert 1,000.0 g of water at 20.0°C to 100.0°C? One Pop TartTM is equal to 800,000 J of energy.

A) 0.418

B) 2.83

C) 3.25

D) 18.0

D - ---Answers---A chunk of iron at 90.6°C was added to 200.0 g of water at 15.5°C. The specific heat of iron is 0.449 J/g°C, and the specific heat of water is 4.184 J/g°C. The temperature of the resulting mixture was 18.2°C. Assuming no heat was lost to the surroundings, what was the mass of the iron added?

• 468 g
• 55.5 g
• 66.9 g
• 69.5 g
• / 2

B - ---Answers---A 24.6 g sample of a metal is heated to 110.0°C and then placed in a coffee cup calorimeter containing 125 g of water at a temperature of 23.00°C. After the metal cools, the final temperature of the metal andwater is 24.83°C.Assuming no heat has escaped to the surroundings or been absorbed by the calorimeter, calculate the specific heat of the metal.

• 4.18 J/g°C
• 0.457 J/g°C
• 0.499 J/g°C
• 1.00 J/g°C

A - ---Answers---The dissociation of a salt in water to from an aqueous solution is called enthalpy of solution, ΔHsoln. The ΔHsoln for CaCl2 is -120 kJ/mol. When CaCl2 is added to water

_____.

• the temperature of the water will increase.
• the temperature of the water will remain the same.
• the process is endothermic.
• nothing will occur, CaCl2 is insoluble

C - ---Answers---The value of ΔH° for the reaction below is - 336 kJ. Calculate the heat (kJ) released to the surroundings when 23.0 g of HCl is formed.CH4 (g) + 3Cl2 (g) CHCl3 (l) + 3HCl (g)

• 211
• / 2