8 A small quantity of hydrochloric acid was added toa large quantity of marble chips in an evaporatingdish, which was placed on the pan of a balance. Themass of the dish and its contents was recordedhalf minute. The results are shown in theeverygraph below.25.125.024.924.8-24.7-24.6+0.:::3.4.Time / minutesa Explain why the curve slopes down.b Which result would seem to be incorrect? Why?What was the mass of the evaporating dish andits contents (i) at the start and (ii) at the end ofthe experiment?d What mass of carbon dioxide was produced?e How long did the reaction last?f During which of these times in the experimentwas the rate of reaction most rapid:0-min?g Make a copy of the graph. On your copy, sketchthe1-1 min?3- 3 min?curve youchilled.would expect if the acid had first beenh Now sketch the curve you would expect if thechips had first been crushed to powder.iWhat apparatus could be used instead of anevaporating dish, to prevent any loss of acid bysplashing?Mass of dish and contents/ grams

As per the rule only three sub parts can be answered.

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

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

Publisher:Crouch

Chapter2: Basic Statistical Analysis With Excel

Section: Chapter Questions

Problem 12P

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