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Common Physical Quantities in Chemistry

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Questions and Answers

Which apparatus is considered the most accurate for measuring time?

Digital stopwatch (correct)
Kitchen timer
Sand timer
Analogue stopwatch

Which unit is NOT an SI unit for measuring length?

Metre
Foot (correct)
Millimetre
Centimetre

Which of the following statements about the alcohol thermometer is correct?

It can measure body temperature accurately.
It operates in a range of -10°C to 110°C. (correct)
It is digital and easy to read.
It measures temperatures below -10°C.

What is the main limitation of the measuring tape compared to a metre rule?

<p>It has lower accuracy, depending on the type. (B)</p> Signup and view all the answers

What type of thermometer is specifically designed for measuring body temperature?

<p>Oral digital thermometer (B)</p> Signup and view all the answers

Flashcards

What is the SI unit of time?

The SI unit of time is the 'second'.

What is a common tool to measure temperature?

A thermometer is a common tool for measuring temperature. It can be either an alcohol or digital thermometer.

What is a common tool to measure length?

A metre rule is a straightforward tool for measuring length.

What is the difference between an alcohol thermometer and a digital laboratory thermometer?

An alcohol thermometer uses the expansion of alcohol to indicate temperature, while a digital thermometer uses a sensor to display the temperature digitally.

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What is the relationship between accuracy and measurement tools?

The accuracy of a measurement tool impacts the precision of the measurement results. Different tools have varying accuracies, so choosing the right one for the context is crucial.

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Study Notes

Common Physical Quantities

Time, temperature, length, mass, and volume are common physical quantities measured in chemistry labs.

Appropriate Apparatus

Time: Digital stopwatches (accurate to 0.01 seconds) or analogue stopwatches (accurate to 0.15 seconds).
Temperature: Alcohol thermometers (range -10°C to 110°C), digital laboratory thermometers, oral digital thermometers (body temperature). Temperature sensors connected to data loggers offer automatic data collection.
Length: Metre rules (accurate to 0.1 cm), measuring tapes (accurate to 0.1 or 0.5 cm depending on the type).
Mass: Kilograms, grams, tonnes are used to measure mass
Volume: Cubic metres, cubic centimetres, cubic decimetres measure volume.

Apparatus for Experiments

The choice of apparatus depends on the specific experiment and level of accuracy needed.

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Description

This quiz covers the fundamental physical quantities commonly used in chemistry labs, including time, temperature, length, mass, and volume. Learn about the appropriate measuring apparatus for each quantity and the importance of accuracy in experiments.