Temperature Conversion Quiz
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Questions and Answers

What is the equivalent temperature in Kelvin for 37°C?

  • 309 K
  • 312 K
  • 311 K
  • 310 K (correct)

    • 1°C corresponds to a change of 1 K.

    True

    Convert 39°C to Fahrenheit.

    102.2°F

    To convert Celsius to Kelvin, you add __________.

    <p>273.15</p> Signup and view all the answers

    Match the temperatures in Celsius with their equivalent in Kelvin:

    <p>36°C = 309 K 37°C = 310 K 39°C = 312.15 K 5°C = 278.15 K</p> Signup and view all the answers

    Which of the following formulas is used to convert Fahrenheit to Celsius?

    <p>C = (F - 32) × 5/9</p> Signup and view all the answers

    To find body temperature in Fahrenheit, you multiply the Celsius value by 9/5.

    <p>False</p> Signup and view all the answers

    What is the temperature range in Kelvin between 36°C and 37°C?

    <p>1 K</p> Signup and view all the answers

    Which of the following statements is true regarding physical and chemical changes?

    <p>A physical change does not change the identity of a substance.</p> Signup and view all the answers

    Diagrams (b) and (c) represent physical changes.

    <p>False</p> Signup and view all the answers

    What are the two types of numbers used in chemistry?

    <p>Exact and inexact numbers.</p> Signup and view all the answers

    An example of an exact number is __________ as it is defined.

    <p>12 in the definition of a dozen</p> Signup and view all the answers

    Which diagram represents a physical change?

    <p>Diagram (d)</p> Signup and view all the answers

    Inexact numbers can only be derived from counting.

    <p>False</p> Signup and view all the answers

    Define significant figures in measurements.

    <p>Significant figures indicate the precision of a measured quantity.</p> Signup and view all the answers

    Match the type of number to its definition:

    <p>Exact Number = A number with a defined value Inexact Number = A number derived from measurement</p> Signup and view all the answers

    How many significant figures are in the number 305?

    <p>3</p> Signup and view all the answers

    Zeros located to the left of the first nonzero digit are considered significant figures.

    <p>False</p> Signup and view all the answers

    What is one way to express a number that has ambiguous significant figures?

    <p>Scientific notation</p> Signup and view all the answers

    The number 1.200 has __________ significant figures.

    <p>four</p> Signup and view all the answers

    Which of the following numbers has two significant figures?

    <p>0.0023</p> Signup and view all the answers

    The number 100 may have __________, __________, or __________ significant figures.

    <p>one, two, or three</p> Signup and view all the answers

    Match the following descriptions with the correct number of significant figures:

    <p>0.0023 = 2 significant figures 50.08 = 4 significant figures 1.30 × 10^2 = 3 significant figures 100 = Ambiguous significance</p> Signup and view all the answers

    When a number has a decimal point, any trailing zeros are considered significant.

    <p>True</p> Signup and view all the answers

    What is the mass of the gas when the container is filled with it?

    <p>1.9 g</p> Signup and view all the answers

    The density of the gas is expressed in g/cm³.

    <p>True</p> Signup and view all the answers

    What is the volume of the container in cm³?

    <p>985.0</p> Signup and view all the answers

    Density is calculated using the formula: density = mass / __________.

    <p>volume</p> Signup and view all the answers

    Match the following values with what they represent:

    <p>124.6 g = Mass of the empty container 126.5 g = Mass of the container with gas 1.9 g = Mass of the gas 9.850 × 10² cm³ = Volume of the container</p> Signup and view all the answers

    What is the final density of the gas rounded to correct significant figures?

    <p>1.9 × 10^-3 g/cm³</p> Signup and view all the answers

    The mass of the gas can be determined without any calculations.

    <p>False</p> Signup and view all the answers

    What is the appropriate number of significant figures for the calculated density of the gas?

    <p>2</p> Signup and view all the answers

    What should you do if the leftmost digit to be dropped is equal to or greater than 5?

    <p>Round up</p> Signup and view all the answers

    Exact numbers have a limited number of significant figures.

    <p>False</p> Signup and view all the answers

    What determines the number of significant figures in the result of a multiplication or division operation?

    <p>The original number with the smallest number of significant figures.</p> Signup and view all the answers

    In calculations with multiple steps, it is best to retain at least one extra digit until the end to minimize ______.

    <p>rounding error</p> Signup and view all the answers

    Match the following operations with their outcome in terms of significant figures:

    <p>Addition = Result determined by the least number of decimal places Multiplication = Result determined by the least number of significant figures Subtraction = Result determined by the least number of decimal places Division = Result determined by the least number of significant figures</p> Signup and view all the answers

    What is the result of rounding 11.2154 to the correct number of significant figures if 1.4 has 2 significant figures?

    <p>11</p> Signup and view all the answers

    Rounding errors can be avoided by rounding at each step of a multi-step calculation.

    <p>False</p> Signup and view all the answers

    When adding 317.5 mL and 0.675 mL, the result should be reported as ______ mL.

    <p>318.2</p> Signup and view all the answers

    Study Notes

    Temperature Conversion

    • Normal human body temperature varies from approximately 36°C (morning) to 37°C (afternoon).
    • Conversion to Kelvin:
      • 36°C = 309 K
      • 37°C = 310 K
    • A 1°C change corresponds to a 1 K change.

    Temperature Formulas

    • Celsius to Fahrenheit:
      [(°C × \frac{9°F}{5°C}) + 32°F]
    • Fahrenheit to Celsius:
      [(°F - 32°F) × \frac{5°C}{9°F}]

    Physical vs Chemical Changes

    • Physical Changes: Identity of the substance remains unchanged.
    • Chemical Changes: Identity of the substance changes post-reaction.
    • Example: Certain diagrams may represent chemical changes (b & c) while others may depict physical changes (d).

    Uncertainty in Measurements

    • Measurement types:
      • Exact numbers (defined values)
      • Inexact numbers (derived from measurement).
    • Significant figures reflect the precision of a measured value.

    Significant Figures Rules

    • Non-zero digits are always significant.
    • Zeros between non-zero digits are significant.
    • Leading zeros are not significant.
    • Trailing zeros are significant only if there is a decimal point.
    • Ambiguity in trailing zeros can be resolved using scientific notation.

    Rounding Rules

    • If the digit to be dropped is 5 or greater, round up.
    • In calculations, retain one extra digit to minimize rounding errors.

    Calculations with Significant Figures

    • In multiplication/division, the result should reflect the least number of significant figures in the inputs.
    • Exact numbers do not limit significant figures in results.
    • For multi-step calculations, minimize rounding error by keeping more digits until the final result.

    Example Problems

    • Sample calculations involve adding, subtracting, multiplying, and dividing measured values while adhering to significant figure rules.
    • The density calculation requires steps: First, determine mass, then divide by volume, applying significant figures rules.

    Density Calculation Example

    • Given a container mass of 124.6 g and a filled mass of 126.5 g:
      • Mass of gas = 126.5 g - 124.6 g = 1.9 g
      • Volume = 9.850 × 10² cm³
      • Density = mass/volume = 1.9 g / 9.850 × 10² cm³ = 1.9 × 10⁻³ g/cm³.

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    Description

    Test your understanding of temperature conversion from Celsius to Kelvin. This quiz covers normal human body temperature and the range it spans throughout the day. Use the formula K = °C + 273.15 to solve the problems presented.

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