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Sophie [7]
3 years ago
6

In the chemical formula H2O , which description explains what the 2 represents?

Chemistry
2 answers:
alukav5142 [94]3 years ago
8 0

the number of hydrogen atoms

Alja [10]3 years ago
3 0

Answer:

In the chemical formula H2O , which description explains what the 2 represents?

Explanation:

the number of hydrogen atoms

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You are given a solution that is 518 mM lactose. You need to make up 4.5 L of 16.7 mM solution. What volume do you need to trans
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Answer:

The volume you need to transfer from the stock solution is 0.145 l

Explanation:

Since the number of moles of lactose in the volume of stock solution that you transfer will be the same as the number of moles of lactose in the final solution, you can use this expression:

number of moles in volume to transfer = number of moles in the final solution

Since number of moles = concentration * volume (if the concentration is expressed in molarity), then:

Ci * Vi = Cf * Vf

where:

Ci = concentration of the stock solution.

Vi = volume of the stock solution to be transferred.

Cf = concentration of the final solution

Vf = volume of the final solution

Then, replacing with the data:

518 mM * Vi = 16.7 mM * 4.5 l

Vi = 16.7 mM * 4.5 l / 518 mM

<u>Vi = 0.145 l or 145 ml</u>

Notice that any concentration unit can be used, as long as the units of the concentration of the stock and final solution are the same.

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3 years ago
Your teacher asks you to design an experiment that shows how plants respond to changes in their environment. You have two identi
tia_tia [17]

Answer:

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To test the hypothesis, experiments are performed. This is the experiment.

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After the experiments, the results are compiled and a conclusion is drawn.

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2. What is one effect of convection currents in the mantle?
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