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2 years ago

Can you please help solve and explain the steps for the calculation?

Chemistry

1 answer:

Nimfa-mama [501]2 years ago

8 0

Answer:

The hydrogen ion concentration in a solution, [H+], in mol L-1, can be calculated if the pH of the solution is known.

pH is defined as the negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 pH = -log10[H+] ...

[H+] in mol L-1 can be calculated using the equation (formula): [H+] = 10-pH

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Which of the following elements has the largest atomic radius?

kirza4 [7]

Answer:Noble gases:

are highly reactive.

react only with other gases.

do not appear in the periodic table.

are not very reactive with other elements.

Explanation:Noble gases:

are highly reactive.

react only with other gases.

do not appear in the periodic table.

are not very reactive with other elements.

4 0

2 years ago

(23.4m)(14m) rounded off to the correct number of significant figures

VARVARA [1.3K]

The value of the given expression up to correct significant figures is $330 m^2$ .

The rule that applies for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The rule that applies for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

Given:

The expression: (23.4m)(14m)

To find:

The answer up to correct a number of significant figures.

Solution

Number of significant figures in '23.4' = 3

Number of significant figures in '14' = 22

$=(23.4m)(14m)\\=(23.4m)\times (14m)\\=327.6 m^2$

The number with the least significant figures is '14' is 2, so the answer will be reported up to 2 significant figures:

$=327.6 m^2\approx 330 m^2$

Number of significant figures in '330' = 3

The value of the given expression up to correct significant figures is $330 m^2$ .

Learn more about significant figures here:

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brainly.com/question/17177568?referrer=searchResults

5 0

3 years ago

7. How many milligrams are equal to 0.0268 pounds? (1 oz = 28.34 g, 16oz = 1lb)

Sphinxa [80]

Answer: 12156.275515999867

12156 simplified repeated decimal.

Explanation:

6 0

3 years ago

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 g of luminol into a total vol

Svet_ta [14]

The answer is in the photo

7 0

3 years ago

Which four practices are examples of how humans use science?

valentinak56 [21]

Answer:

A. Making decisions that help humans survive

B. Developing technologies that help humans thrive

C. Developing explanations based on facts

E. Gathering facts that explain natural events

Explanation:

The above are examples of the practices of how humans use science.

Science has been of tremendous help to humans in making decisions that make humans survive and develop technologies that help humans thrive. It has helped to gather and develop explanations that are based on facts. It has helped to explain natural events.

8 0

3 years ago