Which of the following can be classified as a mixture:
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sugar
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table salt
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air
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iron
Solution not yet available.
An element can be defined as:
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A substance that cannot be separated into two or more
substances by ordinary chemical (or physical) means
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A substance with constant composition
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A substance that contains two or more substances, in definite
proportion by weight
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A uniform substance
Solution not yet available.
Classify each of the following substances as an element, a
compound, a homogeneous mixture, or a
heterogeneous mixture: salt, pure water, soil, salt water, pure
air, carbon dioxide, gold and bronze.
Solution not yet available.
Look at the table below. In the first column (A) is a list of substances. In
the second column (B) is a description of the group that each of these
substances belongs in. Match up the substance in Column A with
the description in Column B.
Solution not yet available.
You are given a test tube that contains a mixture of iron filings and sulfur.
You are asked to weigh the amount of iron in the sample.
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Suggest one method that you could use to separate the iron
filings from the sulfur.
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What property of metals allows you to do this?
Solution not yet available.
Given the following descriptions, write the chemical formula for each of the
following substances:
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silver metal
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a compound that contains only potassium and bromine
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a gas that contains the elements carbon and oxygen in a ratio
of \(\text{1}\):\(\text{2}\)
Solution not yet available.
Give the names of each of the following compounds:
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\(\text{NaBr}\)
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\(\text{Ba}(\text{NO}_{2})_{2}\)
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\(\text{SO}_{2}\)
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\(\text{H}_{2}\text{SO}_{4}\)
Solution not yet available.
Give the formula for each of the following compounds:
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iron (II) sulfate
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boron trifluoride
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potassium permanganate
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zinc chloride
Solution not yet available.
For each of the following materials, say what properties of the material make
it important in carrying out its particular function.
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tar on roads
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iron burglar bars
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plastic furniture
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metal jewellery
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clay for building
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cotton clothing
Solution not yet available.