Researching Chemistry

Question 1

Apparatus

Answer 1

conical flask
-beaker
-measuring cylinder
-delivery tube
-dropper
-test tubes/boiling tubes
-funnel
-filter paper
-evaporating basin
-pipette with safety filler
-burette
-volumetric flask
-distillation flask
-condenser
-thermometer

Question 2

General Practice Techniques you should be able to describe/draw

Answer 2

-simple filtration using filter paper and a funnel to separate the
residue from the filtrate
-use of a balance, including measuring mass by difference
-methods for the collection of gases including:
collection over water (for relatively insoluble gases, or
where a dry sample of gas is not required)
collection using a gas syringe (for soluble gases or where a
dry sample of gas is required)
-safe methods for heating using Bunsen burners, water baths or
heating mantles
-determining enthalpy changes using Eh
-volumetric analysis:
the volume markings on beakers provide only a rough
indication of volume
measuring cylinders generally provide sufficient accuracy
for preparative work, but for analytical work, burettes,
pipettes and volumetric flasks are more appropriate
titration is used to accurately determine the volumes of
solution required to reach the end-point of a chemical
reaction
-preparation of a standard solution
- simple distillation using a flask, condenser and suitable heat
source to separate a mixture of liquids with different boiling
points

Question 3

You should be able to

Answer 3

 tabulating data using appropriate headings and units of
measurement
 representing data as a scatter graph with suitable scales and
labels
 sketching a line of best fit (straight or curved) to represent the
trend observed in the data
 calculating average (mean) values
 identifying and eliminating rogue points
 commenting on the reproducibility of results where
measurements have been repeated

Question 4

The uncertainty associated with a measurement can be indicated in
the form:

Answer 4

measurement ± uncertainty.