CAIE IGCSE Chemistry 3.2 Relative Masses of Atoms and Molecules Topic Practice

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Question 1

[Maximum number: 1]

The relative atomic mass, ArA_{\mathrm{r}}, of an element is determined by comparing the mass of one atom of the element with the mass of one atom of element Q.

What is Q ?

A

carbon

B

chlorine

C

hydrogen

D

oxygen

Question 2

[Maximum number: 1]

A compound of element X has the formula X2O\mathrm{X}_{2} \mathrm{O} and a relative formula mass of 144 . What is element X ?

A

copper, Cu

B

gadolinium, Gd

C

sulfur, S

D

tellurium, Te

Question 3

[Maximum number: 1]

Calcium carbonate, CaCO3\mathrm{CaCO}_{3}, reacts with dilute hydrochloric acid to produce carbon dioxide.
The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100 .

CaCO3+2HCl→CaCl2+H2O+CO2\mathrm{CaCO}_{3}+2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}

10 g of calcium carbonate is reacted with an excess of dilute hydrochloric acid.
Which mass of carbon dioxide is produced?

A

2.2 g2.2 \mathrm{~g}

B

2.8 g2.8 \mathrm{~g}

C

4.4 g4.4 \mathrm{~g}

D

44 g44 \mathrm{~g}

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