Term
| Covalent bonds are formed by the (1) of electrons. Covalent substancees have (2) electrical conductivity. |
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Definition
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Term
| What substance is not used as a fuel? |
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Definition
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Term
| Which changes of condition slow down the reaction between magnesium and air? |
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Definition
| Using magnesium ribbon instead of powdered magnesium. |
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Term
| Dilute sulguric acid is added to a mixture of copper, magnesium and zinc in a beaker. The beaker is left for about 10 minutes and its contents are then filtered. What does the filtrate contain? |
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Definition
| Magnesium sulphate and zinc sulphate. |
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Term
| Why is argon used instead of air in the light blub? |
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Definition
| The filament glows more brightly. |
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Term
| Element X exists as diatomic molecules. In which group oof the Periodic Table is X placed? |
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Definition
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Term
| Which statement is correct about all metals? |
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Definition
| They may be used to form alloys. |
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Term
Alloys are (X).
(Y) alloys conduct electricity. |
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Definition
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Term
| A piece of equipment needs to be made from a metal that is of low density, relatively strong and resistant to corrosion. Which metal is best suited for this? |
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Definition
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Term
| What is true about diamond and graphite. |
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Definition
| They are different solid forms of the same element. |
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