Theory

CH6 - USING MOLES

(a) A compound contains 72% magnesium and 28% nitrogen. What is its empirical formula? ..................................................................

2009 Summer

Theory

CH6 - USING MOLES

Titanium is a transition element. It is isolated by the following reactions.titanium ore $\rightarrow$ titanium(IV) oxide $\rightarrow$ titanium(IV) c...

2010 Summer

Theory

CH6 - USING MOLES

Nitrogen dioxide is a brown gas. It can be made by heating certain metal nitrates. $$2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2$$ (a) (i) Name anoth...

2010 Summer

Theory

CH6 - USING MOLES

Nitrogen dioxide is a brown gas. It can be made by heating certain metal nitrates.\[ \text{2Pb(NO}_3\text{)}_2 \rightarrow \text{2PbO} + \text{4NO}_2 ...

2010 Summer

Theory

CH6 - USING MOLES

(a) Complete this method of preparing dry crystals of the soluble salt cobalt(II) chloride-6-water from the insoluble base cobalt(II) carbonate.Step 1...

2010 Winter

Theory

CH6 - USING MOLES

The diagram shows an experiment to find the formula of magnesium oxide. Which piece of apparatus would be needed in addition to those shown?A a balan...

2013 Summer

Theory

CH6 - USING MOLES

(a) Define the following(i) the mole.....................................................................................................................

2013 Summer

Theory

CH6 - USING MOLES

(a) Lead has a typical metallic structure which is a lattice of lead ions surrounded by a 'sea' of mobile electrons. This structure is held together b...

2013 Winter

MCQ

CH6 - USING MOLES

A compound, X, contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass.The relative molecular mass, $M_r$, of X is 60.What is the molecular form...

2016 Summer

MCQ

CH6 - USING MOLES

The equation for the reaction between calcium carbonate and hydrochloric acid is shown. $$\text{CaCO}_3(s) + 2\text{HCl}(aq) \rightarrow \text{CaCl}_2...

2016 Summer

Theory

CH1 - STATES OF MATTER

The diagram shows a cup of tea. Which row describes the water particles in the air above the cup compared with the water particles in the cup?[Table_1...

2013 Summer

Theory

CH11 - ACIDS AND BASES

Crystals of sodium chloride were prepared by the following method.1 25.0cm3 of dilute hydrochloric acid was accurately measured into a conical flask....

2013 Summer

Theory

CH11 - ACIDS AND BASES

Lead iodide is insoluble in water.Lead iodide is made by adding aqueous lead nitrate to aqueous potassium iodide.Which pieces of apparatus are needed ...

2013 Summer

Theory

CH3 - ATOMS AND ELEMENTS

Element X is represented by $^{27}_{13}X$.Which statement about element X is correct?A. An atom of X contains 13 protons and 13 neutrons.B. An atom of...

2013 Summer

Theory

CH12 - THE PERIODIC TABLE

The positions of four elements are shown on the outline of the Periodic Table.Which element forms a coloured oxide?

2013 Summer

Theory

CH4 - ATOMS COMBINING

For which substance is the type of bonding \textbf{not} correct?[Table_1]The table contains the following:\begin{center}\begin{tabular}{|c|c|c|c|}\hli...

2013 Summer

Theory

CH4 - ATOMS COMBINING

Element X has six electrons in its outer shell. How could the element react? A by gaining two electrons to form a positive ion B by losing six elec...

2013 Summer

Theory

CH1 - STATES OF MATTER

The diagram shows an incomplete circuit. Which substance causes the lamp to light when added to the glass tube? A. aqueous sodium chloride B. aqu...

2013 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

A compound with the formula XF$_2$ has a relative formula mass of 78.What is element X?A) argonB) calciumC) neonD) zirconium

2013 Summer

Theory

CH13 - THE BEHAVIOR OF METALS

What is the balanced chemical equation for the reaction between calcium and water?A. $\text{Ca} + \text{H}_2\text{O} \rightarrow \text{CaOH} + \text{H...

2013 Summer