Significant Figures Rules Quiz
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Questions and Answers

What is the correct result of adding (3.45 × 10^4) and (2.30 × 10^4)?

  • 5.75 × 10^5
  • 5.75 × 10^3
  • 5.76 × 10^4
  • 5.75 × 10^4 (correct)

    • When dividing (4.78 × 10^6) by (2.39 × 10^2), what is the resulting scientific notation?

  • 2.00 × 10^2
  • 2.00 × 10^4 (correct)
  • 2.00 × 10^8
  • 2.00 × 10^6

    • Which operation requires adjusting the decimal, and why?

  • Multiplying coefficients with the same exponent
  • Dividing coefficients in different units
  • Subtracting two numbers with different exponents (correct)
  • Adding two numbers with the same exponent

    • What happens when multiplying a coefficient greater than 10 in scientific notation?

    <p>Move the decimal left and add 1 to the exponent</p> Signup and view all the answers

    In which operation do you not need to have the same exponents?

    <p>Multiplication of numbers</p> Signup and view all the answers

    Which scenario demonstrates an appropriate laboratory safety procedure?

    <p>None of the above.</p> Signup and view all the answers

    What was the main hypothesis tested in Redi's experiment regarding maggots?

    <p>Maggots develop from eggs laid by flies.</p> Signup and view all the answers

    What did people historically believe about the origin of worms?

    <p>They emerged from decaying wood.</p> Signup and view all the answers

    If Zach had followed proper safety protocol, what would he have done?

    <p>He would have worn appropriate safety goggles.</p> Signup and view all the answers

    What was a consequence of the improper disposal of chemicals by Logan and Monica?

    <p>They may have clogged the sink or damaged plumbing.</p> Signup and view all the answers

    Which of the following numbers has the most significant figures?

    <p>123.40</p> Signup and view all the answers

    In significant figures, how many significant figures does the number 0.003400 contain?

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

    When performing addition, if you are adding 15.674 and 2.1, how many decimal places should the final answer have?

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

    Which of the following is a correct representation of a number in scientific notation?

    <p>6.02 x 10^23</p> Signup and view all the answers

    What is the result when rounding the number 12.567 to two significant figures?

    <p>12.6</p> Signup and view all the answers

    Which of the following operations should be used to determine the number of significant figures in the result of 7.5 x 6.002?

    <p>Count significant figures</p> Signup and view all the answers

    If a number has a leading zero, such as 0.000524, how many significant figures does it have?

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

    How would you convert the standard number 340000 to scientific notation?

    <p>3.4 x 10^5</p> Signup and view all the answers

    Which scenario depicts both high accuracy and high precision?

    <p>One point placed precisely in the center bullseye</p> Signup and view all the answers

    What characterizes a scenario with low accuracy and low precision?

    <p>Points are scattered without any clustering or proximity to the bullseye</p> Signup and view all the answers

    In which scenario is accuracy high, but precision low?

    <p>Several points with random distribution, averaging near the center</p> Signup and view all the answers

    Which of the following indicates high precision but low accuracy?

    <p>Several points differ from the center but are closely grouped</p> Signup and view all the answers

    Which scenario describes low precision but high accuracy?

    <p>Several points scattered around with an average at the bullseye</p> Signup and view all the answers

    What is the independent variable in the experiment assessing the growth of tomatoes under different music genres?

    <p>The music genre</p> Signup and view all the answers

    In the experiment testing the effect of salt on egg buoyancy, which of the following is the dependent variable?

    <p>Height an egg floats</p> Signup and view all the answers

    Which hypothesis aligns with the experiment of sealing jars to observe maggots and flies?

    <p>If jars are covered, flies and maggots won't appear.</p> Signup and view all the answers

    What controlled variables were considered in Aiko's paper airplane experiment?

    <p>Amount of wind and location of test flight</p> Signup and view all the answers

    Which conclusion can be drawn from the experiment involving the jars with meat?

    <p>Properly sealed containers prevent maggots and flies from appearing.</p> Signup and view all the answers

    Which laboratory tool would be most suitable for accurately measuring liquid volumes?

    <p>Graduated Cylinder</p> Signup and view all the answers

    What is the primary function of a Bunsen burner in a laboratory?

    <p>To provide heat</p> Signup and view all the answers

    Which of the following tools is best suited for the storage of liquids in a laboratory setting?

    <p>Erlenmeyer Flask</p> Signup and view all the answers

    Why is a filter paper preferred over a strainer for separating small particles from a liquid?

    <p>Filter paper is designed to trap smaller particles effectively.</p> Signup and view all the answers

    In the context of laboratory tools, what is the function of a dropper?

    <p>To dispense small amounts of liquid</p> Signup and view all the answers

    What is the primary reason for using a glass rod when pouring liquids into a narrow-mouthed container?

    <p>It directs the flow of liquid and minimizes spillage.</p> Signup and view all the answers

    Why is it important to heat a test tube at a 45° angle?

    <p>To allow for uniform heat distribution and prevent breakage.</p> Signup and view all the answers

    What is the correct protocol when diluting concentrated acid?

    <p>Add concentrated acid to water with constant stirring.</p> Signup and view all the answers

    What should you avoid doing while heating a test tube?

    <p>Pointing the mouth of the test tube towards yourself.</p> Signup and view all the answers

    What happens if water is poured into concentrated acid?

    <p>It can cause violent spattering due to rapid steam generation.</p> Signup and view all the answers

    What is the main purpose of ensuring the proper handling of a stopper from a reagent bottle?

    <p>To prevent accidental contamination and injury.</p> Signup and view all the answers

    Which of the following items is necessary for conducting evaporation at Station 4?

    <p>Evaporating dish</p> Signup and view all the answers

    During the handling of liquids, what technique helps prevent liquid from dripping down the side of a narrow-mouthed container?

    <p>Keeping the neck of the bottle touching the rim of the receiving vessel.</p> Signup and view all the answers

    Which material is NOT listed as part of Station 6's setup?

    <p>Test tube</p> Signup and view all the answers

    What is the primary function of a funnel in laboratory operations?

    <p>To facilitate the transfer of liquids into containers.</p> Signup and view all the answers

    What should a student do with a flat-top stopper after removing it from a reagent bottle?

    <p>Lay it upside down on the table.</p> Signup and view all the answers

    In the context of laboratory safety, why is it vital to handle solid reagents with care?

    <p>They could spill and contaminate the workspace.</p> Signup and view all the answers

    How can students best demonstrate the process of decantation as outlined in the objectives?

    <p>By allowing solid particles to settle before pouring off the liquid.</p> Signup and view all the answers

    What is the primary reason for using a water bath during evaporation?

    <p>To maintain a constant temperature for sensitive samples</p> Signup and view all the answers

    Why is it necessary to keep glassware dry on the outside before heating?

    <p>Moisture can cause inaccurate measurements</p> Signup and view all the answers

    Which practice should NEVER be followed when handling solids?

    <p>Returning unused chemicals to their original containers</p> Signup and view all the answers

    What is the step to ensure clean transfer of solids into a test tube?

    <p>Fold the paper carefully into a funnel</p> Signup and view all the answers

    What should be done if a spatula is known to be dirty?

    <p>Dispose of it and obtain a new one</p> Signup and view all the answers

    What is the primary purpose of folding filter paper into a cone before filtration?

    <p>To prevent splashing during pouring</p> Signup and view all the answers

    Why is filtration ineffective for separating dissolved solids from liquids?

    <p>Dissolved solids are too small to be trapped by the filter paper</p> Signup and view all the answers

    In which situation would decantation be preferred over filtration?

    <p>When solids settle quickly and can be poured off</p> Signup and view all the answers

    What is the primary reason water remains non-potable after decantation?

    <p>There are still potential pathogens and dissolved particles present</p> Signup and view all the answers

    What happens to the sediment during the decantation process?

    <p>It is allowed to settle before the liquid is poured off</p> Signup and view all the answers

    Study Notes

    Significant Figures (SIG.FIGS)

    • Non-zero digits are always significant.
    • Zeros between non-zero digits (sandwiched zeros) are significant.
    • Trailing zeros in whole numbers without a decimal point are not significant.
    • Trailing zeros in a decimal number are significant.
    • Leading zeros are never significant.
    • In scientific notation, all digits in the coefficient are significant.

    Atlantic - Pacific Rule

    • The Atlantic rule applies when the decimal point is absent; start counting significant figures from the Atlantic side.
    • The Pacific rule applies when the decimal point is present; start counting significant figures from the Pacific side.
    • Example: 100 has 1 significant figure, while 100. has 3 significant figures.

    Rounding Off Significant Figures

    • If the digit to round is 5 or more, increase the preceding digit by one.
    • If the digit to round is 4 or less, keep the preceding digit the same.

    Operations with Significant Figures

    Addition and Subtraction

    • Consider the number of decimal places in each number.
    • The final answer should have the same number of decimal places as the measurement with the fewest decimal places.

    Multiplication and Division

    • Count the significant figures in all numbers.
    • The final answer should be expressed with the lowest number of significant figures used in the calculation.

    Scientific Notation

    • Coefficients must range between 1 and 10 (1.1-9.9).
    • The base is always 10 with an exponent.
    • Negative exponents indicate decimal numbers.

    Converting to and from Scientific Notation

    • Move the decimal left to convert a standard number to scientific notation; the number of moves becomes the positive exponent.
    • Move the decimal right to convert scientific notation to standard form; the number of moves equals the negative exponent.

    Mastery Test Coverage

    Addition and Subtraction

    • If exponents are the same, perform the operation and keep the exponent.
    • If exponents differ, adjust the decimal point for equal exponents before summing.

    Multiplication and Division

    • Exponents need not be the same.
    • For multiplication, multiply coefficients and add exponents.
    • For division, divide coefficients and subtract exponents.

    Accuracy and Precision

    • Accuracy refers to how close measurements are to the true value.
    • Precision refers to the consistency of measurements.
    • Scenarios depict varying combinations of accuracy and precision, from high accuracy and precision to low accuracy and precision.

    Laboratory Procedures and Safety

    • Proper usage of laboratory tools and techniques is crucial for safe conduct in experiments.
    • Review safety procedures, including the importance of wearing safety goggles and the correct handling of chemicals.
    • Understand the filtration process and the importance of using appropriate equipment to ensure successful results.

    Common Lab Tools and Operations

    • Familiarize with various lab tools like graduated cylinders, test tubes, beakers, and their specific uses.
    • Classification of tools based on their functions, such as heating, measuring, and storing.
    • Learn the proper techniques for handling liquids and solids in a lab environment, ensuring safety and accuracy in experiments.

    Filtration and Decantation Techniques

    • Filtration involves separating solids from liquids using filter paper.
    • Decantation is used for separating heavier solids from liquids by carefully pouring off the liquid without disturbing the solids.
    • Understand that dissolved solids cannot be separated by filtration, as this represents a chemical change.

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    Description

    Test your knowledge of significant figures with this quiz. Learn the important rules regarding non-zero digits, trailing zeros, and zeros in scientific notation. Perfect for students looking to master this key concept in mathematics or science.

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