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Lostsunrise [7]
3 years ago
9

Please answer number 2

Chemistry
1 answer:
alexandr402 [8]3 years ago
8 0

Answer:

A

Explanation:

Because Rainwater can get acidic because of the carbonic acid that it contains

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Can sedimentation and decantation be used for all types of mixtures? Explain
Bumek [7]

Explanation:

1. Sedimentation and decantation cannot be used for all types of mixtures.

Decantation is a separation technique in which is used to separate immiscible liquids or mixtures containing liquid and solids within them.

In decantation, gravity is used to bring the denser materials to settle at the bottom.

For homogenous mixtures, it is not possible to use decantation. A solution of sugar and water will not decant.

2. Yes, mass of an object reduces the settling time of such object in a mixture.

The higher the mass, the faster the rate of settling. Also, as we know, mass is directly proportional to density. A body with a high density will settle faster in solution.

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3 years ago
Which element consists of positive ions immersed in a "sea" of mobile electronsa) sulfur
Margarita [4]
Hello
Sulfur is the answer
5 0
2 years ago
Why does group 18 in the periodic table not form ions?
alukav5142 [94]
Lets take a moment to list all the characteristics of the group 18 (also known as noble gases and/or group 8) elements: 
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Now.. lets take some time to think about why elements want to form ions: 

Elements form ions to either gain or lose valence electrons to the element they bond with. This helps them GAIN a full octet. What is a full octet, you may ask? An octet is when an element has all 8 valence electrons and is stable, making it nonreactive. 

Why would an element with a full octet want to bond? It already has a full octet, it does not need to bond. 

That, my fellow Brainly user, is why the noble gases do not need to bond. 

I really do hope this helps! Enjoy, and good luck on the studies. 
4 0
2 years ago
In a fission reaction of U-235, there was a release of 9.20 × 1011 kJ of energy. What amount of mass in kilograms would have bee
Hatshy [7]
<span>e = mc^2 
 
m = e / c^2 

Plug in your numbers in the appropriate units.
</span><span>m=1.02 × 10^-5

pulled from another response, hope it helps</span>
3 0
2 years ago
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The height of mercury in a closed-end manometer is 655 mm and the atmospheric pressure is 760 mm Hg.
Olenka [21]

I don't understand

Explanation:

can u explain more

4 0
3 years ago
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