Chemistry 5070/21 — October/November 2017

Cambridge O-Level · Theory · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Organic Chemistry · Atoms, Elements and Compounds · Stoichiometry · Acids, Bases and Salts · Chemistry of the Environment · Metals · +6 more

Q19MThe Periodic TableChemistry of the EnvironmentMetalsExperimental Techniques and Chemical AnalysisOrganic ChemistryAtoms, Elements and CompoundsFree sample

(a)

Choose from the following elements to answer the questions.

calcium
chlorine
chromium
copper
krypton
nitrogen
oxygen
sodium
sulfur

Each element may be used once, more than once or not at all.

Which element:

(i)

is a monatomic gas,

______

(ii)

makes up 78% of dry air,

______

(iii)

has an oxide which reacts with the impurities in a blast furnace to form slag,

______

(iv)

forms aqueous ions with a 2+ charge which give a dark blue solution on addition of excess aqueous ammonia,

______

(v)

reacts with propane in the presence of ultraviolet light by a substitution reaction?

______

(b)

Complete the table to show the number of electrons and number of neutrons in the sulfur atom and in the magnesium ion.

	number of electrons	number of neutrons
$^{33}_{16}\text{S}$
$^{25}_{12}\text{Mg}^{2+}$

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8 more questions

Q2Atoms, Elements and Compounds · Electrochemistry13M
Q3Atoms, Elements and Compounds · Metals · Stoichiometry9M
Q4Organic Chemistry9M
Q5Stoichiometry · Chemical Energetics · Organic Chemistry5M
Q6Acids, Bases and Salts · Chemical Reactions · Organic Chemistry · States of Matter10M
Q7Atoms, Elements and Compounds · Acids, Bases and Salts · Stoichiometry10M
Q8Stoichiometry · Chemistry of the Environment · Experimental Techniques and Chemical Analysis · Acids, Bases and Salts10M
Q9Organic Chemistry · Chemical Reactions10M

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