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3 Quantitative chemistry

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Question 16

A student investigated the reaction of copper powder with oxygen in the air. Three samples of copper powder, $A$ , $B$ , and $C$ , were heated in open crucibles until they were completely oxidised. The table below shows the mass measurements obtained:

Sample	Mass of sample before heating in $g\text{g}$	Mass of sample after heating in $g\text{g}$	Increase in mass of sample in $g\text{g}$
$A$	3.42	4.14	0.72
$B$	3.35	4.13	$Z$
$C$	3.50	4.40	0.90

Calculate the value of $Z\,$ in the table.

[2]

Calculate the mean increase in mass of the three copper samples, $A$ , $B$ , and $C$ .

[3]

Markscheme

3 Quantitative chemistry Questions

GCSE
Chemistry
3 Quantitative chemistry

3 Quantitative chemistry

Question bank

3 Quantitative chemistry

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Question 16

Sample	Mass of sample before heating in $g\text{g}$	Mass of sample after heating in $g\text{g}$	Increase in mass of sample in $g\text{g}$
$A$	3.42	4.14	0.72
$B$	3.35	4.13	$Z$
$C$	3.50	4.40	0.90

Calculate the value of $Z\,$ in the table.

[2]

Calculate the mean increase in mass of the three copper samples, $A$ , $B$ , and $C$ .

[3]

Markscheme

3 Quantitative chemistry Questions

GCSE
Chemistry
3 Quantitative chemistry