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

MCQ

CH1 - STATES OF MATTER

Which statement explains why ammonia gas, $\text{NH}_3$, diffuses at a faster rate than hydrogen chloride gas, $\text{HCl}$?

2019 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

2.00 g of powdered calcium carbonate is added to 50.0 cm$^3$ of hydrochloric acid. Which apparatus is used to measure the calcium carbonate and the h...

2019 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

The measurements from a chromatography experiment using substance F are shown. The diagram is not drawn to scale.What is the $R_f$ value of F?

2019 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Which statement about an atom of fluorine, $^{19}_{9}\text{F}$, is correct?

2019 Summer

MCQ

CH4 - ATOMS COMBINING

Which row describes the formation of single covalent bonds in methane?

2019 Summer

MCQ

CH4 - ATOMS COMBINING

Which statement describes the structure of an ionic compound?

2019 Summer

MCQ

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Propane burns in oxygen. $\text{C}_3\text{H}_8 + x\text{O}_2 \rightarrow 3\text{CO}_2 + y\text{H}_2\text{O}$Which values of $x$ and $y$ balance the eq...

2019 Summer

MCQ

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

A tablet contains 0.080g of ascorbic acid ($M_r = 176$).What is the concentration of ascorbic acid when one tablet is dissolved in 200 cm$^3$ of water...

2019 Summer

MCQ

CH1 - STATES OF MATTER

Which statement about the electrolysis of copper(II) sulfate solution using carbon electrodes is correct?

2019 Summer

MCQ

CH1 - STATES OF MATTER

Aluminium metal is extracted from aluminium oxide by electrolysis. Which ionic half-equation describes a reaction that occurs at the named electrode?...

2019 Summer