Theory

CH18 - POLYMERS

Lactic acid can be made from corn starch. It polymerises to form the polymer, polylactic acid (PLA) which is biodegradable. (a) Suggest two advant...

2009 Summer

Theory

CH18 - POLYMERS

A macromolecule is a very large molecule. Macromolecules can be made by joining smaller molecules together. This is called polymerisation. Which row i...

2010 Summer

Theory

CH18 - POLYMERS

A macromolecule is a very large molecule.Macromolecules can be made by joining smaller molecules together. This is called polymerisation.Which row in ...

2010 Summer

Theory

CH18 - POLYMERS

A macromolecule is a very large molecule.Macromolecules can be made by joining smaller molecules together. This is called polymerisation.Which row in ...

2010 Summer

Theory

CH18 - POLYMERS

Hydrolysis is used in chemistry to break down complex molecules into simpler ones.(a) Compounds containing the group $\overset{O}{\parallel}C$ or $\te...

2010 Summer

Theory

CH18 - POLYMERS

The hydrolysis of complex carbohydrates to simple sugars is catalysed by enzymes called carbohydrases and also by dilute acids.(a) (i) They are both c...

2010 Summer

Theory

CH18 - POLYMERS

The hydrolysis of complex carbohydrates to simple sugars is catalysed by enzymes called carbohydrases and also by dilute acids.(a) (i) They are both c...

2010 Summer

Theory

CH18 - POLYMERS

Monomers polymerise to form polymers or macromolecules.(a) (i) Explain the term polymerise...............................................................

2010 Winter

Theory

CH18 - POLYMERS

In the absence of oxygen, certain bacteria decompose carbohydrates to biogas. This is a mixture of gases mainly methane and carbon dioxide. Biogas is ...

2010 Winter

Theory

CH18 - POLYMERS

Synthetic polymers are widely used in the modern world.(a) Their use has brought considerable advantages to modern life as well as some disadvantages....

2010 Winter

MCQ

CH1 - STATES OF MATTER

The rate of diffusion of two gases, methane, CH₄, and ethene, C₂H₄, is measured using the apparatus shown.Which gas diffuses faster and why?

2016 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

A sample of a dye is investigated by chromatography. A line is drawn across a piece of chromatography paper and a spot of the dye is placed on it.The ...

2016 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

The paper chromatogram below was obtained from four different dyes.Which dye has an $R_f$ value of 0.7?

2016 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Which statements about isotopes of the same element are correct?1. They are atoms which have the same chemical properties because they have the same n...

2016 Summer

MCQ

CH4 - ATOMS COMBINING

The table shows the electronic structure of four atoms.[Table_1]atom | electronic structure---- | ------------------- W | 2,8,1 X | 2,8,4 Y | 2,...

2016 Summer

MCQ

CH4 - ATOMS COMBINING

Which statement describes the attractive forces between molecules (intermolecular forces)?

2016 Summer

MCQ

CH4 - ATOMS COMBINING

The diagram represents the general structure of a solid Z. What is Z?

2016 Summer

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

CH11 - ACIDS AND BASES

25 cm$^3$ of 0.1 mol/dm$^3$ hydrochloric acid exactly neutralise 20 cm$^3$ of aqueous sodium hydroxide.The equation for this reaction is:NaOH + HCl $\...

2016 Summer

MCQ

CH1 - STATES OF MATTER

Which reactions could take place at the anode during electrolysis? 1. $4\text{OH}^-(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{O}_2(g) + 4e^-$ 2...

2016 Summer