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jeyben [28]
3 years ago
14

Do your answers to the previous questions satisfy

Chemistry
1 answer:
harkovskaia [24]3 years ago
6 0

Answer:

I put B&C

Explanation:

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A sample of silicon rejected for use in an electronic circuit has an impurity of boron at a level of 3 parts per trillion. What
Law Incorporation [45]

Answer:

A. 3 x 10-12

Explanation:

Generally, the parts-per notation is used to represent very small concentration without any specific unit.

Parts per million is notated as 10^{-6}

Parts per billion is notated as 10^{-9}

Parts per trillion is notated as 10^{-12}

Hence, 3 parts per trillion will be written as 3 x 10^{-12}

The correct option is A.

6 0
3 years ago
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A buffer solution is composed of 7.50 mol of acid and 4.75 mol of the conjugate base. If the pKa of the acid is 4.90 , what is t
Mamont248 [21]

Answer:

The correct answer is: pH= 4.70

Explanation:

We use the <em>Henderson-Hasselbach equation</em> in order to calculate the pH of a buffer solution:

pH= pKa + log   \frac{ [conjugate base]}{[acid]}

Given:

pKa= 4.90

[conjugate base]= 4.75 mol

[acid]= 7.50 mol

We calculate pH as follows:

pH = 4.90 + log (4.75 mol/7.50 mol) = 4.90 + (-0.20) = 4.70

7 0
2 years ago
Map<br> Formulate your hypothesis.<br> List down the materials.<br> • Write the methods.
Whitepunk [10]

Answer:

How to Formulate an Effective Research Hypothesis

State the problem that you are trying to solve. Make sure that the hypothesis clearly defines the topic and the focus of the experiment.

Try to write the hypothesis as an if-then statement. ...

Define the variables.

Explanation:

5 0
2 years ago
All of the following are true of carbohydrates except
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3. they make up larger compounds like fats and amino acids, would be the correct answer.

5 0
3 years ago
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Under the Doppler Effect, an observer behind a moving wave source observes
disa [49]
Attachment is the answer
3 0
3 years ago
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