Science Grade 7
Directions: Read and answer the following questions briefly:
21.Differentiate qualitative and quantitative observation.
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22.Explain how elements and compounds are classified as pure substances.
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23.Give 2 examples of homogeneous and heterogeneous mixtures. Why are they
homogeneous or heterogeneous?
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24.How is diluted solution different from a concentrated solution?
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25.How do we express the concentration of solution operationally?
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Directions: Read and answer the following questions briefly:
21.Differentiate qualitative and quantitative observation.
________________________________________________________________________________________
________________________________________________________________________________________
22.Explain how elements and compounds are classified as pure substances.
________________________________________________________________________________________
________________________________________________________________________________________
23.Give 2 examples of homogeneous and heterogeneous mixtures. Why are they
homogeneous or heterogeneous?
________________________________________________________________________________________
________________________________________________________________________________________
24.How is diluted solution different from a concentrated solution?
________________________________________________________________________________________
________________________________________________________________________________________
25.How do we express the concentration of solution operationally?
________________________________________________________________________________________
________________________________________________________________________________________
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Answer:
21.Qualitative observations are made when you use your senses to observe the results. (Sight, smell, touch, taste and hear.) Quantitative observations are made with instruments such as rulers, balances, graduated cylinders, beakers, and thermometers. These results are measurable.
22.Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element. ... For example, water is a compound composed of the elements hydrogen and oxygen. Today, there are about 118 elements in the known universe.
Explanation:
just tell me if it's wrong.