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

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