Significant Figures and Rounding Quiz

Podcast

Play an AI-generated podcast conversation about this lesson

Download our mobile app to listen on the go

Get App

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?

The temperature of the water (C) Signup and view all the answers

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

The point at which sugar stops dissolving (B) Signup and view all the answers

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

The solubility of sugar increases (D) Signup and view all the answers

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

To ensure reliable and valid results (B) Signup and view all the answers

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

To formulate a hypothesis (B) Signup and view all the answers

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

To follow significant digit rules (D) 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?

7.62 cm (D) Signup and view all the answers

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

The digit immediately to the right of the rounding digit (C) 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?

The rounding digit increases by one (C) Signup and view all the answers

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

They are discarded without adjustment (D) Signup and view all the answers

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

Dismiss digits if they are 2, 3, or 4 (D) 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?

The rounding digit stays the same (D) Signup and view all the answers

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

M (B) Signup and view all the answers

What is the independent variable in the experiment?

Temperature of the water (A) Signup and view all the answers

What is the dependent variable in this experiment?

Amount of sugar (A) Signup and view all the answers

Which of the following statements about control variables is true?

They help to ensure that the experiment is fair. (D) Signup and view all the answers

What trend is observed from the results of the experiment?

Solubility increases as the temperature rises. (A) Signup and view all the answers

What can be concluded from the experiment concerning the hypothesis?

The hypothesis is validated. (B) Signup and view all the answers

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

They predict outcomes based on proven hypotheses. (B) Signup and view all the answers

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

Type of sugar used (C) Signup and view all the answers

What determines whether a scientific theory remains valid?

It can be disproved by new facts. (B) Signup and view all the answers

How does scientific research contribute to technology?

By serving as a direct source of ideas for new technological possibilities (D) Signup and view all the answers

What kind of benefits does technology bring to science?

It provides tools and techniques to tackle scientific questions (B) Signup and view all the answers

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

Steam engine (C) Signup and view all the answers

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

Alessandro Volta (C) Signup and view all the answers

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

They contributed to its construction and innovation. (C) Signup and view all the answers

Which advancement has successfully eradicated or controlled serious infectious diseases?

Vaccines (D) Signup and view all the answers

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

To drive machinery using heat (A) Signup and view all the answers

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

Improvements in transportation, agriculture, and manufacturing (D) Signup and view all the answers

What is the correct procedure for heating test tubes safely?

Use a metal clamp and tilt the test tube sideways. (B) Signup and view all the answers

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

Add the acid to the water to prevent splashing. (A) Signup and view all the answers

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

Avoid handling them near heat sources. (C) Signup and view all the answers

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

Use the special waste containers for disposal. (A) Signup and view all the answers

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

Wash the affected area thoroughly with water. (B) Signup and view all the answers

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

Always handle them with care to prevent breakage. (D) Signup and view all the answers

How should you handle substances that release gas?

Always conduct these reactions inside the fume cupboard. (A) Signup and view all the answers

What is the proper way to use a pipette?

Always use a pipette bulb to draw liquids. (C) Signup and view all the answers

Flashcards are hidden until you start studying

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.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.