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7 September, 11:17

1. Classify each of the following as a homogeneous or heterogeneous substance.

a. iron ore

b. quartz

c. granite

d. energy drink

e. oil-and-vinegar salad dressing

f. salt

g. rainwater

h. nitrogen

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  1. 7 September, 11:41
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    a. iron ore - heterogeneous substance

    (it contains a mixture of iron oxides)

    b. quartz - homogeneous substance

    (it is the crystalline silicon dioxide SiO₂, which is a very pure form of SiO₂)

    c. granite - heterogeneous substance

    (it as mixture of different oxides, mainly aluminium and silicon oxides)

    d. energy drink - heterogeneous substance

    (a mixture of water, sugar, carbon dioxide and different substances that may boost concentration, like caffeine)

    e. oil-and-vinegar salad dressing - heterogeneous substance

    (this salad dressing of oil and vinegar is composed of unsaturated triglycerides, acetic acid and water)

    f. salt - homogeneous substance

    (sodium chloride NaCl)

    g. rainwater - homogeneous substance

    (assuming the the atmosphere is clean, it is just pure water H₂O)

    h. nitrogen - homogeneous substance

    (it is the main component of air and it is a diatomic molecule N₂)
  2. 7 September, 11:45
    0
    A homogenous substance is one that has a uniform composition in all its parts.

    A heterogenous substance has different composition in their parts.

    a. iron ore

    Iron ore is a heterogenous substance in which the composition of its part are not uniform.

    b. quartz

    Quartz is a homogenous substance because it is made up of silica alone joined in a framework pattern.

    c. granite

    Granite is heterogenous because it is an aggregate of several minerals like quartz, feldspars e. t. c

    d. energy drink

    Energy drink is homogenous due to the uniformity of the mixture.

    e. oil-and-vinegar salad dressing

    This is a heterogenous substance

    f. salt

    Salt is a homogenous substance because all its parts are uniform

    g. rainwater

    Rainwater is homogeous substance

    h. nitrogen

    Nitrogen is homogeous substance
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