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Mazyrski [523]
3 years ago
11

Which of these is an example of a physical change?

Chemistry
1 answer:
Sonja [21]3 years ago
7 0

Answer: a) sugar dissolving in warm water

Explanation: I think this is the best answer because physical changes are usually reversible and no chemical action occurs

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in Analytical chemistry laboratory. Nickle(ppm)in water sample estimated by two different students was as ,student 1 (25 24 24 2
frosja888 [35]

Answer:

Answers are in the explanation

Explanation:

Precision and accuracy are both statistical concepts. Precision is about how close are the measured values to each other. Accuracy is closeness of the measured values to a specific value or reference value.

There are many ways to calculate precision and accuracy, one is stimating precision as <em>Relative Uncertainty </em>and accuracy as <em>Relative Error.</em>

Formulas are:

Relative Uncertainty: Standard desviation /  Measured value.

Relative Error: Measured Value - Expected Value / Expected value

<em>Measured value is the aveage of the values.</em>

<em />

For student 1:

Mean = 25

Standard desviation = 1.5275

Relative Uncertainty: 1.5275 /  25

Relative Uncertainty: 0.061

Relative Error: 25 - 20 / 20

Relative Error: 0.25

For student 2:

Mean = 24.5

Standard desviation = 0.5477

Relative Uncertainty: 0.5477 / 24.5

Relative Uncertainty: 0.02

Relative Error: 24.5 - 20 / 20

Relative Error: 0.225

<em>As the student 2 has a low Relative error and uncertainty, you can say student 2 is more accurate and precise</em>

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3 years ago
Science 5.13 unit 5 PLZZZ HELPPPP 99 point
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__________ have an electric charge of -1.60 × 10-19 C (-e).
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Answer:

Electrons have an electric charge of -1.60 × 10-19 C

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Neutrinos and Neutrons have 0 e charge.

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What effect does a catalyst have on a reaccion rate an the products formed in a reaccion
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