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sergey [27]
3 years ago
10

What does variable mean

Chemistry
1 answer:
DedPeter [7]3 years ago
4 0
In an experiement things that are changing are called variables.
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What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen?
Feliz [49]
C. 18.0g. all you really have to do is add both of them together and you get your answer.

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3 years ago
True/False (A= True & B =False) 46. Blood is a tissue. 47. Elastic cartilage is found in the ears, nose, epiglottis and lary
swat32

Answer:

46.A 47.B 48.B 49.A.50.A.51.B.52.B

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A fecal transplant can work to cure a patient infected with a very harmful bacteria, such as C. difficile.
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Convert from 300 calories to calories (kicalories)? <br> Please help mee
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Answer:

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4 0
2 years ago
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What would be the total volume of the new solution when it is changed from 0.2 M to 0.04 M?
34kurt
The question is incomplete.

You need two additional data:

1) the original volume
2) what solution you added to change the volume.

This is a molarity problem, so remember molarity definition and formula:

M = n / V in liters: number of moles per liter of solution

To give you the key to answer this kind of questions, supppose the original volumen was 1 ml and that you added only water (solvent).

The original solution was:

V= 1 ml
M = 0.2 M

Using the formula for molarity, M = n / V

n = M×V = 0.2 M × (1 / 10000)l = 0.0002 moles

For the final solution:

n = 0.0002 moles
M = 0.04

From M = n / V ⇒ V = n / M = 0.002 moles / 0.04 M = 0.05 l

Change to ml ⇒ 0.05 l × 1000 ml / l = 50 ml.  This would be the answer for the hypothetical problem that I assumed for you.

I hope this gives you all the cues you need to answer similar problems about molarity.
6 0
3 years ago
Read 2 more answers
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