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Goryan [66]
3 years ago
5

HELP FAST PLZ!!!!

Chemistry
2 answers:
amm18123 years ago
8 0
I would say letter D.
A is biology.
Ecology has to do with distribution of  animals.
Taya2010 [7]3 years ago
7 0
It is d for shure just did it
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Answer: what do i have to do to help.. ;-; like i need instructions and why are the words coverd off black??

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Explanation:

6 0
3 years ago
A bottle of the antiseptic hydrogen peroxide is labeled 3.0% (v/v). How many mL of hydrogen peroxide are in a 400 mL bottle of t
zepelin [54]
There are several ways of expressing concentration of solution. Few of them are listed below
1) mass percentage
2) volume percentage
3) Molarity
4) Normality
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In most of the drugs, concentration is expressed either in terms of mass percentage or volume percentage. For, solid in liquid type systems, mass percentage is convenient way of expressing concentration, while for liquid in liquid type solutions, expressing concentration in terms of volume percentage is preferred. Present system is an example of liquid in liquid type solution 


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It implies that, 3ml  H2O2 is present in 100 ml of solution

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4 0
2 years ago
If the mass of a block of wood is 4.6g and the density is 0.98g/mL what is the volume.
irina [24]

Answer:

The answer is

<h2>4.69 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

volume =  \frac{mass}{density}  \\

From the question

mass of wood = 4.6 g

density = 0.98 g/mL

It's volume is

volume =  \frac{4.6}{0.98}  \\  = 4.69387755...

We have the final answer as

<h3>4.69 mL</h3>

Hope this helps you

3 0
3 years ago
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