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Questions and Answers
What is the value of K when the temperature is measured at 75.4°F?
What is the value of K when the temperature is measured at 75.4°F?
- 24.1
- 297.11 (correct)
- 75.4
- 273.15
How many significant figures does the number 0.052 contain?
How many significant figures does the number 0.052 contain?
- 2 (correct)
- 3
- 4
- 1
Which of the following calculations is rounded correctly according to significant figures?
Which of the following calculations is rounded correctly according to significant figures?
- 0.009967 = 0.00997 (correct)
- 37.24 + 1013 = 1003 (correct)
- 225.618 + 0.23 = 226.00
- 12.34 x 1.23 = 15.0
What is the equivalent pressure of 91.4 atm in torr?
What is the equivalent pressure of 91.4 atm in torr?
What is the conversion of 1.32 meters to centimeters?
What is the conversion of 1.32 meters to centimeters?
Given the calculation 0.578 x 0.435 + 0.28, what is the correct rounded answer?
Given the calculation 0.578 x 0.435 + 0.28, what is the correct rounded answer?
How many meters are there in 8.72 cm?
How many meters are there in 8.72 cm?
What is the result of multiplying 2.561 by 12.35 and then adding 0.31, rounded to two decimal places?
What is the result of multiplying 2.561 by 12.35 and then adding 0.31, rounded to two decimal places?
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Study Notes
Temperature Scales & Conversions
- The temperature of a system can be expressed in degrees Celsius (°C), degrees Fahrenheit (°F), or Kelvin (K).
- Conversion Formulas:
- °F to °C: T(°C) = (T(°F) - 32) / 1.8
- °C to °F: T(°F) = 1.8 T(°C) + 32
- °C to K: T(K) = T(°C) + 273.15
Significant Figures
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Non-zero digits are always significant.
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Zeros between non-zero digits are significant.
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Zeros to the right of a non-zero digit and a decimal are significant.
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Zeros to the left of non-zero digits are not significant.
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Zeros to the right of a non-zero digit without a decimal are not significant.
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Multiplication and Division: The final result should have the same number of significant figures as the number with the fewest significant figures.
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Addition and Subtraction: The final result should have the same number of decimal places as the number with the fewest decimal places.
Unit Conversions
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Common Conversions:
- 1 foot = 12 inches
- 1 meter = 100 cm
- 1 atm = 1.01325 x 105 Pa = 760 torr
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Conversion Steps:
- Identify the units you need to convert from and to.
- Find the conversion factor that relates those units.
- Multiply the original value by the conversion factor, making sure the units cancel out to leave you with the desired units.
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