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ollegr [7]
3 years ago
7

5TH GRADE SCIENCE!!!!!!

Chemistry
2 answers:
Yuri [45]3 years ago
4 0

Answer:

Phase changes that require a loss in energy are condensation and freezing.

Explanation:

nika2105 [10]3 years ago
3 0

Answer:

freezing consensation

Explanation:

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The concentration of hydrogen in soil sample 13 * 10 ^ - 6 * M the soil is tested with a pH meter, what value should the meter r
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pH = 4.9

Explanation:

Given data

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The pH is a scale used to determine <em>the acidity or basicity of a solution</em>. The pH is related to the concentration of hydrogen ions through the following expression.

pH = -log [H⁺]

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<h3>What are significant figures?</h3>

The term significant figures has to do with the figures that have a mathematical meaning. We know that the result has to correspond to the highest number of significant figures.

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