A mixture of a metal with one or more other elements.
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In which reaction would displacement happen?A)copper + magnesium sulfate B) iron + calcium sulfate C)magnesium + copper sulfate D)iron + potassium sulfate
C)magnesium + copper sulfate
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15
What is the chemical name given to rust?
hydrated iron(III) oxide
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Most of metals which occur in their native state in nature:A)are very active B)do not form any compound C)are not reactive D)are moderately reactive
C)are not reactive
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15
The ability of metal to be hammered into sheets is called ________.
malleability
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15
Which of the following does not prevent rusting of iron?A)painting,oiling,galvanizing B)attach to a piece of copper C)connect to a piece of magnesium with copper wire D)cover entirely with copper
B)attach to a piece of copper
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15
Which metal is in liquid state at room temperature?
Mercury
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State 2 harmful effects of nitrogen oxides.
acid rain, photochemical smog, respiratory problem
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What is the chemical used to kill bacteria in water in the water treatment plant?
chlorine
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magnesium + steam â
magnesium oxide + hydrogen (magnesium very slowly with cold water)
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15
Name a chemical that can be used to test the presence of water.
anhydrous copper(II) sulfate (white to blue) OR anhydrous cobalt(II) chloride(blue to pink)
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15
Which is NOT a use of zinc?A)sacrificial protection B)galvanising C)making bronze D)making brass
