Chemistry 1 Worksheet 4 Temperature in Chemistry 1
Conversion factors: Celsius to Kelvin: Add 273.15 Kelvin to Celsius: Subtract 273.15 Celsius to Fahrenheit: T(F) = (T(C) x 1.8) + 32 Fahrenheit to Celsius: T(C) = (T(F) 32) x 5 /9 1. What do each of the following symbols stand for? a. K b. o C c. o F 2. Convert the following temperatures to Fahrenheit. a. 54 o C b. 25 o C c. 32 o C d. -35 o C 2
3. Convert the following temperatures to Celsius. a. 4 o F b. 51 o F c. -0.5 o F d. 33 o F 4. Convert the following temperatures to Kelvin. a. 54 o C b. 25 o C c. 32 o C d. -35 o C 3
5. Convert the following temperatures to Celsius. a. 543 K b. 273 K c. 2789 K d. 0 K 6. Convert the following temperatures to Fahrenheit. a. 450K b. 5K 4
7. Convert the following temperatures to Kelvin. a. 2 o F b. -22 o F 8. Which is the lowest temperature: 5 o F, 22 o C, or 183 K? 5
9. Circle the following option that is not a valid value for temperature. a. 4.0 X 10 5 o F b. -35 K c. -75 o C d. 750 K e. 20 o F 10. The freezing point of water is 32 o F and 0 o C. What is the freezing point of water in Kelvin? 11. Is water a solid, liquid or a gas at 245 K? 6
Answer Key Conversion factors: Celsius to Kelvin: Add 273.15 Kelvin to Celsius: Subtract 273.15 Celsius to Fahrenheit: T(F) = (T(C) x 1.8) + 32 Fahrenheit to Celsius: T(C) = (T(F) 32) x 5 /9 1. What do each of the following symbols stand for? a. K Kelvin b. o C degrees Celsius c. o F degrees Fahrenheit 2. Convert the following temperatures to Fahrenheit. a. 54 o C b. 25 o C T(F) = (T(C) x 1.8) + 32 T(F) = (54 o C x 1.8) + 32 T(F) = (97.2) + 32 T(F) = 77 o F T(F) = 129.2 o F c. 32 o C d. -35 o C T(F) = 89.6 o F T(F) = -31 o F 7
3. Convert the following temperatures to Celsius. a. 4 o F b. 51 o F T(C) = (T(F) 32) x 5 /9 T(C) = (4 o F 32) x 5 /9 T(C) = (-28) x 5 /9 T(C) = 10.6 o C T(C) = -15.6 o C c. -0.5 o F d. 33 o F T(C) = -18.1 o C T(C) = 0.56 o C 4. Convert the following temperatures to Kelvin. a. 54 o C b. 25 o C 54 o C + 273.15 = 327.15 K 25 o C + 273.15 = 298.15 K c. 32 o C d. - 35 o C 54 o C + 273.15 = 305.15 K - 35 o C + 273.15 = 238.15 K 8
5. Convert the following temperatures to Celsius. a. 543 K b. 273 K 543 K 273.15 = 269.85 o C 273 K 273.15 = -0.15 o C c. 2789 K d. 0 K 2789 K 273.15 = 2515.85 o C 0 K 273.15 = -273.15 o C 6. Convert the following temperatures to Fahrenheit. a. 450 K First, we need to convert to Celsius. 450 K - 273.15 = _176.85 o C_ T(F) = (T(C) x 1.8) + 32 T(F) = (176.85 o C x 1.8) + 32 T(F) = 318.33 + 32 Correct answer: T(F) = 350.33 o F b. 5 K 5 K - 273.15 = _-268.15 o C_ T(F) = (T(C) x 1.8) + 32 T(F) = (-268.15 o C x 1.8) + 32 T(F) = -482.67 + 32 Correct answer: T(F) = -450.7 o F 9
7. Convert the following temperatures to Kelvin. a. 2 o F We must first convert Fahrenheit to Celsius. T(C) = (T(F) 32) x 5 /9 T(C) = (2 o F 32) x 5 /9 T(C) = (-30) x 5 /9 T(C) = -16.7 o C K = -16.7 + 273.15 Correct answer: K = 256.5 K b. -22 o F T(C) = (-22 o F 32) x 5 /9 T(C) = (-54) x 5 /9 T(C) = -30 o C K = -30 + 273.15 Correct answer: K = 243.15 K 8. Which is the lowest temperature: 5 o F, 22 o C, or 183 K? In order to solve this, we need to convert all values to a common scale. Celsius will require the least amount of work. T(C) = (T(F) 32) x 5 /9 5 o F = -15 o C 183 K 273.15 = - 90.15 o C Correct answer: 183 K (-90.15 o C) is the lowest temperature. 10
9. Circle the following option that is not a valid value for temperature. Kelvin is what is known as an absolute temperature scale. This means that its possible values begin at 0 K, the temperature at which all molecular motion ceases. Because of this, it is not possible to have a value lower than 0 on this scale. Correct answer: b. -35 K 10. The freezing point of water is 32 o F and 0 o C. What is the freezing point of water in Kelvin? Here, we can simply convert degrees Celsius to Kelvin by adding 273.15 + 0 o C = 273.15 K. To confirm that the answer is the same if we convert from Fahrenheit: T(C) = (T(F) 32) x 5 /9 T(C) = (32 o F) 32) x 5 /9 T(C) = (0) x 5 /9 T(C) = 0 o C 0 o C + 273.15 = 273.15 K Correct answer: 273.15 K 11
11. Is water a solid, liquid or a gas at 245 K? Recall from the video that water freezes at 0 o C (a solid) and boils at 100 o C (a gas) and is a liquid at all temperatures in between. To solve this problem, we will need to convert 245 K to Celsius. 245 K 273.15 = -28.15 o C Correct answer: Since this value is less than 0 o C, water is a solid at 245 K. 12