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

CH2 - SEPARATING SUBSTANCES

Petroleum is a useful natural resource.The diagram shows how petroleum can be separated into useful substances.(a) What is the name of the separation ...

2020 Spring

Theory

CH11 - ACIDS AND BASES

Aluminium is extracted from its ore. The ore is converted into pure aluminium oxide, which then undergoes electrolysis as shown.(a) (i) Name an ore of...

2020 Spring

Theory

CH12 - THE PERIODIC TABLE

(a) Identify the element which is in Group VI and Period 4...............................................................................................

2020 Spring

Theory

CH13 - THE BEHAVIOR OF METALS

Iron is a typical transition element.Iron:● acts as a catalyst● forms coloured compounds● has more than one oxidation state.(a) Name one major i...

2020 Spring

Theory

CH18 - POLYMERS

There are two types of polymers.(a) Addition polymers are made from many identical small units. (i) What is the term used to describe these small unit...

2020 Spring

MCQ

CH1 - STATES OF MATTER

A mixture of ice and water is left to stand and the ice melts.Which row describes what happens as the ice is melting?[Table_1]temperature of mixture |...

2020 Summer

MCQ

CH1 - STATES OF MATTER

Which piece of apparatus should be used to measure exactly 21.4 cm$^3$ of water?

2020 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

The chromatogram for an unknown dye is shown.What is the $R_f$ value of the dye?

2020 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

The atomic number and nucleon number of a potassium atom are shown.[Table_1]How many protons, neutrons and electrons are in a potassium ion, K⁺?

2020 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

The electronic structures of two atoms, P and Q, are shown. P and Q combine together to form a compound.What is the type of bonding in the compound an...

2020 Summer