Chapter 30 Multiple choice questions

. A six-sided die is thrown four times. The faces are numbered 1−6. What is the probability P of 4 being the uppermost face each time. Assume no bias.

1/4096

1/24

1/6

1/1256

. A student recrystallizes a sample using three different solvent mixtures. The probability that solvent-system 1 is pure is 70%. The probability that solvent-system 2 is pure is 90%. The probability that solvent-system 3 is pure is 95%.
What is the probability P that all three samples are pure?

P = 0.60 or 60.9%

P = 2.55 or 255%

P = 0.85 or 85.0%

P = 0.843 or 84.3%

. A polyhedron has ten equivalent faces. The faces are numbered 1−10. What is the probability P of the polyhedron landing with a 6 uppermost?

1 or 100%

1/10 or 0.1 or 10%

10 or 1000%

1/6 or 0.167 or 16.7%

. The probability of a student failing an exam is 40%.
What is the probability P of the student passing the exam?

100%

20%

40%

60%

. A store-room contains 15 bottles of chemical. All look identical but 2 are contaminated.
What is the probability of collecting a jar that is not contaminated?

1/15 = 6.67%

2/15 = 13.3%

14/15 = 93.3%.

13/15 = 86.7%

. Which of the following represents a probability P of 1 (100%)?
Assume no bias.

The probability of a die always landing with a six uppermost.

The probability of finding an electron somewhere in all space.

The probability of a carboxylic acid dissociation reaction going to completion if left for an infinite period of time.

The probability of entropy increasing during an irreversible process in a thermodynamic system.

. A student is using faulty equipment. On average, the equipment works two times in three. What is the probability that the equipment works?

P = 0.333 (to 3 s.f.)

P = 1.00 (to 3 s.f.)

P = 0.667 (to 3 s.f.)

P = 0.250 (to 3 s.f.)

. Which of the following represents a genuine instance of a probability P ≈ 0?

The composition of a thermostated reaction mixture will change after equilibrium is reached.

No current flows through an electrode when the electrode overpotential is 0 V.

A reaction between an acid and a base will not proceed at a temperature of 10 K.

Radionuclides immobilized in glass will not diffuse.

. A student must collect a bottle of reagent. Most are pure but 1 in 5 is impure. What is the probability that three bottles in a row are contaminated?

1/5 or 20%

1/25 or 4%

1/625 or 0.160%

1/125 or 0.800%

. The probability that a reaction proceeds to completion is 45%. What is the probability that it does not proceed to completion?

45% (or 0.45)

0

55% (or 0.55)

100% (of 1.00)

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