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3 years ago

Chemical bonds

2 answers:

4 0

Chemical bonds hold atoms together to form compounds through the sharing of electrons or the transferring of electrons.
Bio is not my strongest subject, but I am pretty sure that a pyramid of numbers differs from an ecological pyramid because it displays the number of organisms at each trophic level

Orlov [11]3 years ago

3 0

D. displays the number of organisms at each trophic level.

Hope I was helpful :)

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8 Write the equation

MAVERICK [17]

Answer:

Explanation — This page looks at the oxidation of alcohols using acidified sodium or ... of sodium or potassium dichromate(VI) acidified with dilute sulfuric acid. ... The electron-half-equation for this reaction is as follows: ... To do that, oxygen from an oxidizing agent is represented as [O]. ... Article type: Section or Page.

6 0

3 years ago

As a part of a clinical study, a pharmacist is asked to prepare a modification of a standard 22g package of a 2% mupirocin ointm

Vesna [10]

Answer:

226.8 mg of mupirocin powder are required

Explanation:

Given that;

weight of standard pack = 22 g

mupirocin by weight = 2%

so weight of mupirocin = 2% × 22 = 2/100 × 22 = 0.44 g

so by adding the needed quantity of mupirocin powder to prepare a 3% w/w mupirocin ointment

mg of mupirocin powder are required = ?, lets rep this with x

Total weight of ointment = 22 + x g

Amount of mupirocin = 0.44 + x g

percentage of mupirocin in ointment is 3?

3/100 = 0.44 + x g / 22 + x g

3( 22 + x g ) = 100( 0.44 + x g )

66 + 3x g = 44 + 100x g

66 - 44 = 100x g - 3x g

97 x g = 22

x g = 22 / 97

x g = 0.2268 g

we know that; 1 gram = 1000 Milligram

so 0.2268 g = x mg

x mg = 0.2268 × 1000

x mg = 226.8 mg

Therefore, 226.8 mg of mupirocin powder are required

8 0

3 years ago

A physical change is a change (4 points) in the properties of matter that does not change the identity of the substance in the p

goblinko [34]

Yes a physical change can do that. A chemical change is like a burning candal

4 0

3 years ago

220 mL of oxygen gas was collected over water. The total pressure of oxygen plus water vapor was 745.8 mmHg at 25.0°C. What is t

alukav5142 [94]

The pressure, in mmHg, exerted by only the oxygen gas is 720.8 mmHg

<h3>Pressure of gas collected over water</h3>

The total pressure of a gas collected over water is given by P = P' + p where

P = pressure of oxygen gas and
p = vapour pressure of water at 25 °C = 25 mmHg

Making P' subject of the formula, we have

P' = P - p

Since the total pressure of oxygen plus water vapor is P = 745.8 mmHg, substituting the values of the variables into the equation, we have

P' = P - p

P' = 745.8 mmHg - 25 mmHg

P' = 720.8 mmHg

So, the pressure, in mmHg, exerted by only the oxygen gas is 720.8 mmHg

Learn more about pressure of gas collected over water here:

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2 years ago

The equation for the complete combustion of ethane (C2H4) is

Mandarinka [93]

-6x -8y = 28
6х + 4y =-28

would this be infinite many solutions or no solutions?

5 0

3 years ago