Resistance

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Resistance

Safety - must always wear safety glasses and we should be very careful not to
drop any acid. Fair test- we must make sure that we use the same size, amount
and roughly the same mass of chips, this is because we want to keep the chips
roughly the same all the way through the experiment so that it will be a fair
test and the results we be in relation to each other, otherwise the results will
be completely different to what we will expect and it will ruin the experiment.
We must also take our readings at the same intervals throughout the experiment
i.e. I will take a reading every fifteen seconds for all of my experiments. I
predict that the more concentrated the acid the quicker the reaction will take
place, because the more concentrated the acid is then it will make the chips
react faster and more hydrogen will be given off in a quicker time. The smaller
the stones are, the even quicker the reaction will happen, this is because the
acid has a smaller surface area to act upon. Equipment- We will need a boiling
tube, calcium carbonate chips, hydrochloric acid, water, a stop watch, a gas
syringe and a bung on the top of the boiling tube with a delivery tube connected
to the gas syringe. I will also need a stand and a clamp to hold on to the
syringe. Method When doing my experiments I will use the same procedure
throughout. Once I have set up the apparatus I will measure out 5cm3 of acid in
a measuring tube and then pour it into a boiling tube. Then I will be ready with
the stop watch and then quickly drop in the chips into the acid, push on the
bung and and start the stop watch. This must all be done in a very short space
of time. From there, I must take the reading from the volume in the gas syringe
every fifteen seconds very accurately until it reading is not changing very
much. I must record the results in a table and then write it up neat later. The
factors which may affect how well the experiment works are how quickly the chips
are put in and then the bungplaced on and the stop watch pressed. Although this
is a factor it is not really a major factor that will affect the end results,
and as long as the time it all takes is kept constant throughout then it should
not matter too much. Other factors are what kind of water to use for dilution, I
could either use water from the tap which is not very pure or it may be too hot
or too cold, or I could use distilled water. Tap water may have some things in
it which may affect the results. The temperatur...

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