8 A small quantity of hydrochloric acid was added to a large quantity of marble chips in an evaporating dish, which was placed on the pan of a balance. The mass of the dish and its contents was recorded every half minute. The results are shown in the graph below. 25.1 25.0 24.9 24.8 24.7- 24.6+ 0. 1 3 4 Time / minutes a Explain why the curve slopes down. b Which result would seem to be incorect? Why? What was the mass of the evaporating dish and its contents (i) at the start and (ii) at the end of the experiment? Mass of dish and contents/ grams

Appl Of Ms Excel In Analytical Chemistry
2nd Edition
ISBN:9781285686691
Author:Crouch
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Chapter2: Basic Statistical Analysis With Excel
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8 A small quantity of hydrochloric acid was added to
a large quantity of marble chips in an evaporating
dish, which was placed on the pan of a balance. The
mass of the dish and its contents was recorded
half minute. The results are shown in the
every
graph below.
25.1
25.0
24.9
24.8-
24.7-
24.6+
0.
:::
3.
4.
Time / minutes
a Explain why the curve slopes down.
b Which result would seem to be incorrect? Why?
What was the mass of the evaporating dish and
its contents (i) at the start and (ii) at the end of
the experiment?
d What mass of carbon dioxide was produced?
e How long did the reaction last?
f During which of these times in the experiment
was the rate of reaction most rapid:
0-min?
g Make a copy of the graph. On your copy, sketch
the
1-1 min?
3- 3 min?
curve you
chilled.
would expect if the acid had first been
h Now sketch the curve you would expect if the
chips had first been crushed to powder.
i
What apparatus could be used instead of an
evaporating dish, to prevent any loss of acid by
splashing?
Mass of dish and contents/ grams
Transcribed Image Text:8 A small quantity of hydrochloric acid was added to a large quantity of marble chips in an evaporating dish, which was placed on the pan of a balance. The mass of the dish and its contents was recorded half minute. The results are shown in the every graph below. 25.1 25.0 24.9 24.8- 24.7- 24.6+ 0. ::: 3. 4. Time / minutes a Explain why the curve slopes down. b Which result would seem to be incorrect? Why? What was the mass of the evaporating dish and its contents (i) at the start and (ii) at the end of the experiment? d What mass of carbon dioxide was produced? e How long did the reaction last? f During which of these times in the experiment was the rate of reaction most rapid: 0-min? g Make a copy of the graph. On your copy, sketch the 1-1 min? 3- 3 min? curve you chilled. would expect if the acid had first been h Now sketch the curve you would expect if the chips had first been crushed to powder. i What apparatus could be used instead of an evaporating dish, to prevent any loss of acid by splashing? Mass of dish and contents/ grams
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