Maris Stella High School
Measurements and Experimental Techniques
Name: _________________________(
) Class: 3______ Date: ___________
Topic 1: Measurement and Experimental Techniques
Syllabus Objectives:
(a) Name appropriate apparatus for the measurements of time, temperature,
mass and volume, including burettes, pipettes, measuring cylinders and gas
syringes;
(b) Suggest suitable apparatus, given relevant information, for a variety of simple
experiments, including collection of gases and measurement of rates of
reaction.
1.1
Measurement of Time, Temperature and Mass
Time
Temperature
Mass
Apparatus used
Units
1.2
Measurements of Volumes of Liquids
Apparatus
Accuracy
For measuring accurately
the volume of a liquid. (0 to
50.0cm3)
For measuring accurately a
fixed volume of liquids, e.g.
(20.0 cm3 or 25.0 cm3)
For measuring up to the
nearest cm3, e.g. (24 cm3 or
99 cm3)
(least accurate) For estimating the volume of
a liquid, e.g. (50 cm3 or 100
cm3)
*Note: different decimal places used for different apparatus
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Maris Stella High School
Measurements and Experimental Techniques
Example of Burette
readings :
Burette readings:
Final:
Initial:
Volume of liquid used
=
Initial
reading
1.3
Measurements of Volumes of Gases
Apparatus
Gas Syringe
Hydrochloric
acid+ lumps
of calcium
carbonate
Final
reading
Accuracy
For measuring accurate volume of
gases up to a maximum of 100 cm3.
Accurate volume of gases can be manually
read on the graduated scale, or automatically
recorded using data logging.
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Maris Stella High School
1.4
Measurements and Experimental Techniques
Preparing a Dry Sample of Gas
We can collect dry samples of gases by passing it through drying agent.
Some commonly used drying agents are concentrated sulfuric acid, quicklime
(calcium oxide) and fused calcium chloride.
1.5
Collecting Gases in the Laboratory
Method of collecting a gas depends on the physical properties of the gas:
- The _______________ of the gas in water
- The ______________________ of the gas compared to the density of air
Method
Displacement of
water
Downward deliverydisplacement of air
Upward deliverydisplacement of air
Used on gases that
are insoluble or
slightly soluble in
water.
For fairy soluble or
very soluble gases
in water that are
heavier or denser
than air.
For fairly soluble or
very soluble gases
in water that are
lighter or less
dense than air.
Example
of gases
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Maris Stella High School
Measurements and Experimental Techniques
Method: ________________________________
Method: ________________________________
Method: __________________________________
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