Question 1

A laboratory experiment requires a reaction to be carried out at 77°F. What is this temperature in Celsius?
Correct answer: 25°C

Accepted Answer

25°C

Question 2

A scientist records a temperature of 310 K during an experiment. What is this temperature in degrees Celsius?
Correct answer: 36.85°C

Accepted Answer

36.85°C

Question 3

Which of the following statements about temperature scales is correct?
Correct answer: The Kelvin scale starts at absolute zero, where molecular motion ceases.

Accepted Answer

The Kelvin scale starts at absolute zero, where molecular motion ceases.

Question 4

A medical thermometer reads 38°C. What is this temperature in Fahrenheit?
Correct answer: 100.4°F

Accepted Answer

100.4°F

Question 5

A chemical reaction is only effective above 273 K. What is the minimum temperature in degrees Celsius for the reaction to proceed?
Correct answer: -0.15°C

Accepted Answer

-0.15°C

Question 6

If a sample of water is heated from 20°C to 68°F, what is the change in temperature in Kelvin?
Correct answer: 1.11 K

Accepted Answer

1.11 K

Question 7

A researcher needs to cool a solution to -40°F. What is this temperature in Kelvin?
Correct answer: 233.15 K

Accepted Answer

233.15 K

Question 8

Which of the following best explains why the Kelvin scale is preferred in scientific measurements?
Correct answer: It has an absolute zero, making all temperatures positive and proportional to kinetic energy.

Accepted Answer

It has an absolute zero, making all temperatures positive and proportional to kinetic energy.

Question 9

A weather report states the temperature is 0°F. What is this temperature in Kelvin?
Correct answer: 255.37 K

Accepted Answer

255.37 K

Question 10

A reaction mixture is maintained at 50°C. What is the equivalent temperature in Fahrenheit?
Correct answer: 122°F

Accepted Answer

122°F

Question 11

A student incorrectly converts 25°C to Kelvin by simply multiplying by 2, getting 50 K. What is the correct conversion and what mistake did the student make?
Correct answer: The correct value is 298.15 K; the student should have added 273.15, not multiplied.

Accepted Answer

The correct value is 298.15 K; the student should have added 273.15, not multiplied.

Question 12

A chemical process is optimized at 373.15 K. What is this temperature in Celsius and what real-world event does it correspond to?
Correct answer: 100°C; boiling point of water at 1 atm

Accepted Answer

100°C; boiling point of water at 1 atm

Question 13

Which temperature is the coldest?
Correct answer: -40°C

Accepted Answer

-40°C

Question 14

A patient’s body temperature is measured at 99.5°F. What is this temperature in Celsius?
Correct answer: 37.5°C

Accepted Answer

37.5°C

Question 15

A reaction is carried out at 25°C. What is the temperature in Kelvin and why is this conversion important in chemistry?
Correct answer: 298.15 K; many equations require absolute temperature for correct calculations.

Accepted Answer

298.15 K; many equations require absolute temperature for correct calculations.

Mathematical Relationships Between Temperature Scales

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