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Materials - Levels 3 - 6[ Answers ] | |
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Fill in the missing word. When a solid dissolves in a ___________ a solution is made.
John adds 12.5g of salt to the beaker and stirs until the salt dissolves in the water.
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What is the reading when all the salt has dissolved?
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Describe how John could get all the salt back as a solid form using the salt solution he has made.
Four test tubes were set up as shown, with a shiny new, steel nail in each. |
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Write down the letters of the tubes in which the nail will not rust.
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In which tube will the nail rust the fastest? ___________________________
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Bikes have many steel parts. Suggest two ways to prevent these parts from going rusty. __________________________ ___________________________ Study the flow chart below. Each arrow represents a reaction.
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To leave just zinc, an element has to be removed from zinc oxide. Name the element removed. ______________________
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Zinc is treated with an acid to make zinc sulphate. Which acid is used? _____________________________
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When zinc dissolves in an acid, bubbles of hydrogen gas are given off. How would you test for hydrogen and how do you know if it is present?
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