Chapter 1: The Scientific Endeavour Flashcards
(18 cards)
Name some common instruments used to make measurements?
Measuring cylinder, Electronic balance, Digital calipers, Digital stopwatch, Thermometer
*learn how to read and draw the instruments
The readings taken from the measurements are expressed as?
They are expressed as numerical value with an an unit.
For example, the time shown on the stopwatch.
Numerical value unit representing a
representing the standard of
quantity measured measurement
What is the standardised units called?
International System of Units or SI units
What is the SI unit used for?
It is used to ensure a common standard when making measurements.
What is the SI unit for volume?
m3 ( meter cube) *learn how to convert
What is the SI unit for mass?
kg ( kilogram) *learn how to convert
What is the SI unit for time?
s (seconds) *learn how to convert
What is the SI unit for length?
m (meters) *learn how to convert
What is the SI unit for temperature?
K (kelvin) *learn how to convert
What is it called when the weight on the weighing scale is not zero before starting the experiment?
zero error
What does zero error mean?
Zero error is a type of error in which an instrument gives a non-zero reading when the measured quantity should be zero.
What function on an instrument can reset the zero error?
The ‘tare’ button.
How do you read the measurement on a ruler?
Position the eye so that the line of sight is perpendicular to the marking on the ruler.
How do you read the measurement on a measuring cylinder?
Position the eye so that the line of sight is level with the bottom of the meniscus. (The curved surface of the liquid)
How do you read the measurement on a spring balance?
Position the eye so that the line of sight is perpendicular to the marking on the scale.
How do you read the measurement on a thermometer?
Position the eye so that the line of sight is level with the top of the meniscus.
List all 10 lab safety.
- No eating or drinking
- Tie up hair
- Clothes must not post any danger in the lab
- Goggles must be work if there is any risk of danger
- Wash your hands before leaving the lab.
- Be careful and do not play around.
- Report damage equipment
list the first four hazard symbols an what they are for.
1.Corrosives-cause severe damage on contact with body
2.Harmful/Irritant-irritation, allergic reaction or inflammation of skin. May cause drowsiness and dizziness. Can cause harm to the ozone layer.
3.Environmental Toxicity-cause harmful effects on the environment
4.
