Significant Figures and Rounding Quiz
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Questions and Answers

What is the first step in the scientific method?

  • Testing and experimenting
  • Formulating a hypothesis
  • Drawing conclusions
  • Observation and question (correct)

    • What defines a hypothesis in scientific research?

  • A complete conclusion
  • An idea about the investigation (correct)
  • A strong theory
  • A proved fact

    • Which of the following must be controlled in an experiment?

  • All factors except the one tested (correct)
  • The total amount of materials used
  • All conditions during observation
  • The independent variable

    • In the context of solubility, what does an independent variable refer to?

    <p>The temperature of the water</p> Signup and view all the answers

    What observation might prompt a scientific question regarding sugar and water?

    <p>The point at which sugar stops dissolving</p> Signup and view all the answers

    What happens when you increase the temperature of water in relation to sugar solubility?

    <p>The solubility of sugar increases</p> Signup and view all the answers

    Why is it important for an experiment to be carried out under controlled conditions?

    <p>To ensure reliable and valid results</p> Signup and view all the answers

    What is the role of observation in initiating the scientific method?

    <p>To formulate a hypothesis</p> Signup and view all the answers

    What is the primary reason to dismiss insignificant figures when rounding?

    <p>To follow significant digit rules</p> Signup and view all the answers

    When rounding the number 7.6245 cm using a ruler with millimetre graduation marks, what would the rounded measurement be?

    <p>7.62 cm</p> Signup and view all the answers

    Which digit determines if the rounding digit remains the same or increases by one?

    <p>The digit immediately to the right of the rounding digit</p> Signup and view all the answers

    If the rounding digit is 6 and the digit to its right is 5, what is the result of rounding?

    <p>The rounding digit increases by one</p> Signup and view all the answers

    What happens to digits to the right of the rounding digit after rounding?

    <p>They are discarded without adjustment</p> Signup and view all the answers

    If you were to round the number 12.0347, which rounding rule would apply?

    <p>Dismiss digits if they are 2, 3, or 4</p> Signup and view all the answers

    In rounding whole numbers, what does a digit of 4 or less to the right of the rounding digit indicate?

    <p>The rounding digit stays the same</p> Signup and view all the answers

    What symbol represents the prefix for a factor of 10^6?

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

    What is the independent variable in the experiment?

    <p>Temperature of the water</p> Signup and view all the answers

    What is the dependent variable in this experiment?

    <p>Amount of sugar</p> Signup and view all the answers

    Which of the following statements about control variables is true?

    <p>They help to ensure that the experiment is fair.</p> Signup and view all the answers

    What trend is observed from the results of the experiment?

    <p>Solubility increases as the temperature rises.</p> Signup and view all the answers

    What can be concluded from the experiment concerning the hypothesis?

    <p>The hypothesis is validated.</p> Signup and view all the answers

    What is the role of scientific laws in relation to hypotheses?

    <p>They predict outcomes based on proven hypotheses.</p> Signup and view all the answers

    Which factor is considered a control variable in the given experiment?

    <p>Type of sugar used</p> Signup and view all the answers

    What determines whether a scientific theory remains valid?

    <p>It can be disproved by new facts.</p> Signup and view all the answers

    How does scientific research contribute to technology?

    <p>By serving as a direct source of ideas for new technological possibilities</p> Signup and view all the answers

    What kind of benefits does technology bring to science?

    <p>It provides tools and techniques to tackle scientific questions</p> Signup and view all the answers

    Which development led to improvements in multiple industries including transportation and agriculture?

    <p>Steam engine</p> Signup and view all the answers

    Who is credited with the discovery of the first practical method of generating electricity?

    <p>Alessandro Volta</p> Signup and view all the answers

    What role did various scientists and engineers play in the development of internal combustion engines?

    <p>They contributed to its construction and innovation.</p> Signup and view all the answers

    Which advancement has successfully eradicated or controlled serious infectious diseases?

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

    What was the primary function of the steam engine when it was developed?

    <p>To drive machinery using heat</p> Signup and view all the answers

    What type of improvements did the steam engine lead to in various sectors?

    <p>Improvements in transportation, agriculture, and manufacturing</p> Signup and view all the answers

    What is the correct procedure for heating test tubes safely?

    <p>Use a metal clamp and tilt the test tube sideways.</p> Signup and view all the answers

    What should you do if you need to mix sulphuric acid with water?

    <p>Add the acid to the water to prevent splashing.</p> Signup and view all the answers

    Which of the following is a safety measure regarding flammable substances?

    <p>Avoid handling them near heat sources.</p> Signup and view all the answers

    What is the correct action to take with regard to waste disposal in a laboratory?

    <p>Use the special waste containers for disposal.</p> Signup and view all the answers

    What should you do if you accidentally spill strong acid on your skin?

    <p>Wash the affected area thoroughly with water.</p> Signup and view all the answers

    What is a common safety guideline for handling glass instruments in the lab?

    <p>Always handle them with care to prevent breakage.</p> Signup and view all the answers

    How should you handle substances that release gas?

    <p>Always conduct these reactions inside the fume cupboard.</p> Signup and view all the answers

    What is the proper way to use a pipette?

    <p>Always use a pipette bulb to draw liquids.</p> Signup and view all the answers

    Study Notes

    Rounding Numbers

    • Significant digits are essential for precision in measurement.
    • A ruler with centimeter markings provides only one significant digit.
    • Use rounding to dismiss insignificant figures; for example, 7.6245 cm rounds to 7.62 cm.
    • Rounding rules differ for whole numbers and decimals.

    Rounding Rules

    • Whole Numbers:

      • Rounding digit remains unchanged if the following digit is 0, 1, 2, 3, or 4; turn subsequent digits to 0.
      • Rounding digit increases by one if the next digit is 5, 6, 7, 8, or 9; subsequent digits become 0.

    • Decimal Numbers:

      • Dismiss digits to the right of the rounding digit if it is 4, 3, 2, or 1.
      • Add one to the rounding digit if it is 6, 7, 8, or 9, then discard subsequent digits.

    Scientific Method Stages

    • Observation and Question:

      • Observations lead to questions about natural phenomena, such as the solubility of sugar in water based on temperature.

    • Formulating a Hypothesis:

      • A hypothesis should predict outcomes based on observed variables, e.g., increasing water temperature enhances sugar solubility.

    • Testing and Experimentation:

      • Conduct experiments under controlled conditions, modifying only the independent variable (water temperature) while keeping other factors constant.

    • Analysis of Results:

      • Organize data into tables and graphs to draw conclusions.
      • Confirmed hypothesis: Increased temperature correlates with higher sugar solubility.

    • Laws and Theories:

      • From validated hypotheses, scientific laws are formulated.
      • Theories explain laws, can vary, and remain valid until disproven by new evidence.

    Lab Safety Guidelines

    • Limit materials on the work table to necessary items only.
    • Always wear gloves, lab coat, and safety glasses when required.
    • Handle glassware carefully to prevent breakage; use metal clamps to heat test tubes properly.
    • Never handle flammable substances near heat sources, and avoid food and drink in the lab.
    • Strong acids/bases are corrosive; always add acid to water to prevent splashing.
    • Dispose of waste properly; do not return unused substances to stock containers.
    • Use a pipette bulb to avoid ingestion of hazardous substances.

    Impact of Scientific Research

    • Significant advancements in technology stem from scientific research, impacting everyday life.
    • Science and technology interdependently foster progress, generating ideas and providing necessary tools.
    • Major technological achievements include the steam engine, electricity development, internal combustion engine, and vaccines.
    • Vaccines, developed through extensive research, have effectively controlled or eradicated many infectious diseases.

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    Related Documents

    Unit 1 Scientific Research PDF

    Description

    Test your understanding of significant figures and rounding in measurements. This quiz covers how to read a ruler marked in centimeters and millimeters, and the importance of precision when expressing measurements. Challenge yourself with various scenarios and improve your measurement skills!

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