PW International Boards

Welcome to PW International Boards, your one-stop destination for educational support tailored to students of international curriculums like IGCSE, AS/A Levels, IB, and more. We're here to help you excel in your studies with Quality resources, guidance, and exam strategies. Our journey began by focusing on the needs of Cambridge IGCSE and AS/A Level students, providing everything from past paper solutions to detailed video lectures. Join us as we expand to cover even more subjects and curriculums, ensuring you have the tools you need to succeed on your academic journey!

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PW International Boards

Q.Copper(II) sulfate crystals are blue. They are made by adding an excess of copper(II) oxide to sulfuric acid. The mixture is heated and stirred. It is then filtered and the filtrate is allowed to evaporate, leaving blue crystals.
Why is filtration necessary?

7 months ago | [YT] | 0

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PW International Boards

Q.Which statement about ions and ionic bonding is correct?

7 months ago | [YT] | 0

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PW International Boards

Q. Graphite is a form of carbon. Why can graphite be used as a lubricant?

7 months ago | [YT] | 2

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PW International Boards

Q. An oxide of nitrogen has the following composition by mass: N, 30.4%; O, 69.6%. It has a relative molecular mass of 92. What is the molecular formula of the oxide of nitrogen?

7 months ago | [YT] | 0

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PW International Boards

Q. During the electrolysis of concentrated hydrochloric acid, gases are produced at both electrodes. Which statement describes the test result for the gas collected at the negative electrode?

7 months ago | [YT] | 2

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PW International Boards

Q. Which process is used to make an alkene from a long-chain alkane?

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PW International Boards

Q. Which substance is not produced during the electrolysis of concentrated aqueous sodium chloride?

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PW International Boards

Q. Which element has an oxide that is used as a food preservative?