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

Theory

CH3 - ATOMS AND ELEMENTS

The table shows the numbers of protons, neutrons and electrons in particles A to I.[Table_1]Answer the following questions about particles A to I. Eac...

2021 Spring

Theory

CH15 - AIR AND WATER

The elements shown are gases at room temperature and pressure.hydrogennitrogenoxygenchlorine(a) State which one of these gases is green..................

2021 Spring

Theory

CH16 - SOME NON-METALS AND THEIR COMPOUNDS

This question is about ammonia.(a) Nitrogen reacts with hydrogen to form ammonia in an industrial process.$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(...

2021 Spring

Theory

Concentration and Titration

A student wanted to make some zinc chloride crystals. The student followed the procedure shown. step 1 Add excess zinc powder to dilute hydrochlor...

2021 Spring

Theory

Plastics

The table shows the names or structures of organic compounds P to U. (a) Give the letters of the organic compounds, P to U, that are unsaturated hy...

2021 Spring

Theory

CH18 - POLYMERS

Polymers are large molecules built up from small molecules.(a) State the name given to the small molecules from which polymers are made..................

2021 Spring

MCQ

CH1 - STATES OF MATTER

A gas is released at point P in the apparatus shown. Which gas turns the damp universal indicator paper red most quickly?

2021 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

A mixture is separated using the apparatus shown. What is the mixture?

2021 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

Which statement about paper chromatography is correct?

2021 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct?

2021 Summer