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Xtremepapers.net
May 15th
10
Chemistry
9th Grade
05/15/2011

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Cards

Term
Covalent bonds are formed by the (1) of electrons. Covalent substancees have (2) electrical conductivity.
Definition
1-sharing
2_low
Term
What substance is not used as a fuel?
Definition
Oxygen
Term
Which changes of condition slow down the reaction between magnesium and air?
Definition
Using magnesium ribbon instead of powdered magnesium.
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?
Definition
Magnesium sulphate and zinc sulphate.
Term
Why is argon used instead of air in the light blub?
Definition
The filament glows more brightly.
Term
Element X exists as diatomic molecules. In which group oof the Periodic Table is X placed?
Definition
Group VII
Term
Which statement is correct about all metals?
Definition
They may be used to form alloys.
Term
Alloys are (X).
(Y) alloys conduct electricity.
Definition
X-mixtures
Y-All
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?
Definition
aluminium
Term
What is true about diamond and graphite.
Definition
They are different solid forms of the same element.
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