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22 May Hydrogen Peroxide

Posted at 06:11h in Chemistry Tuition Questions by admin

7) Aqueous hydrogen peroxide is used to sterilise contact lenses. At room temperature, aqueous hydrogen peroxide decomposes very slowly to form water and oxygen. The decomposition can...

22 May Vinegar – An Overview

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a) (i) Give evidence from the diagram which demonstrates that the above reaction is exothermic. ……………………………………………………………………………………………… (ii) Construct the balanced chemical equation for the above reaction....

12 May Secondary Chemistry Tuition Question and Answer

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Terephthoyl chloride and ethylene glycol react by polymerisation to produce a polymer called poly(ethylene terephthalate), commonly known as PET. PET is used to make soft...

12 May Organic Molecular Structures – Questions and Answers

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Terephthoyl chloride and ethylene glycol react by polymerisation to produce a polymer called poly(ethylene terephthalate), commonly known as PET. PET is used to make soft...

12 May Basic questions of chemistry

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Methane, CH4, is the major constituent of natural gas. (a) Draw a dot-and cross-diagram to show how the outer shell electrons are arranged in methane. (b) At a...

12 May Methane -The Main Constituent of Natural Gas

Posted at 07:26h in Chemistry Tuition Questions by admin

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3 . Methane, CH4, is the major constituent of natural gas. (a) Draw a dot-and cross-diagram to show how the outer shell electrons are arranged in methane. ...

09 May Boron Nitride – An Overview

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(a) Suggest why boron nitride with structure A can be used as a lubricant. ...

09 May Are you able to answer this Secondary Chemistry Tuition Question? (Part 2)

Posted at 10:43h in Chemistry Tuition Questions by admin

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Several small pieces of magnesium are placed on a block of solid carbon dioxide. The solid carbon dioxide is at a temperature of -60 °C. The...

07 May Suggest Why Calcium Oxide Is Used To Neutralize Acidic Soils

Posted at 04:55h in Chemistry Tuition Questions by admin

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9. Cement is made by heating clay with crushed calcium carbonate. During this process, the calcium carbonate is first converted to calcium oxide. (a) Suggest why calcium...

05 May Silicate – An Overview

Posted at 08:36h in Chemistry Tuition Questions by admin

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2 .        Sorrel is a small green plant.
(a)        The pigments in the sorrel leaf can be separated by chromatography.
(i)         Describe how chromatography can...

05 May O Level Chemistry Tuition Question

Posted at 08:18h in Chemistry Tuition Questions by admin

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Although certain bacteria in the soil convert nitrogen gas into nitrates, other bacteria convert nitrogen into ammonium salts. The ionic equation for this second reaction is N2...

05 May IP Chemistry Tuition – Question and Answer

Posted at 08:17h in Chemistry Tuition Questions by admin

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Although certain bacteria in the soil convert nitrogen gas into nitrates, other bacteria convert nitrogen into ammonium salts. The ionic equation for this second reaction is N2...

05 May Periodic Table Questions (Practice)

Posted at 08:16h in Chemistry Tuition Questions by admin

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5 In the Periodic Table, how many periods include the elements of atomic numbers 1-18? A ...

05 May The Periodic Table of Elements

Posted at 08:09h in Chemistry Tuition Questions by admin

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9. Which graph shows the number of electrons in the outer shell of an atom, plotted against the proton (atomic) number for the first ten elements...

05 May Chemistry Tuition Question On Mole

Posted at 08:04h in Chemistry Tuition Questions by admin

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13 Which quantity is the same for one mole of ethanol and one mole of ethane?
A. mass
B....