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fiasKO [112]
3 years ago
13

A student went outside every night for eight nights to look at the Moon. The pictures below show how the Moon looked each

Chemistry
1 answer:
Temka [501]3 years ago
8 0

Answer:

mother chod fgjgcbu to ghbj

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Determine whether or not each ion contributes to water hardness.
Virty [35]

Answer: The ion that contribute to water hardness are:

--> a. Ca2+

--> b. (HCO)3^- and

--> c. Mg2+

While K+ DOES NOT contribute to water hardness.

Explanation:

WATER in chemistry is known as a universal solvent. This is so because it is polar in nature and dissolves most inorganic solutes and some polar organic solutes to form aqueous solutions. It is composed of elements such as hydrogen and oxygen in the combined ratio of 2:1.

Water is said to be HARD if it does not lather readily with soap. There are two types of water hardness:

--> Permanent hardness: This is mainly due to the presence of CALCIUM and MAGNESIUM ions in the form of soluble tetraoxosulphate(VI) and chlorides. These ions are removed by adding washing soda or caustic soda.

--> Temporary hardness: This is due to the presence of calcium HYDROGENTRIOXOCARBONATES. It can be removed by boiling and using slaked lime.

Therefore from the above given ions, Ca2+,(HCO)3^- and Mg2+ contributes to water hardness.

4 0
3 years ago
Plz help me asap i need this plz
Arturiano [62]
I think it’s because from earth things may appear smaller smaller in space where in actuality in space it can be way larger
6 0
3 years ago
How to tell which element is oxidized in a reaction?
adoni [48]
If in a redox reaction oxidation state of elements decreases or looses electron(s), the element is said to be oxidized. Hope this helps you!
4 0
3 years ago
3NO2 + H2O = 2 HNO3 + NO
ArbitrLikvidat [17]

Explanation:

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8 0
3 years ago
How does the moon's physical characteristics make it easier for scientists to study than the sun?
Vlad1618 [11]

Answer:

1st question: The moon is closer to Earth so it is easier to see and visit.

2nd question: The moon has a week/month cycle instead of a day/night cycle.

3rd question: The corona

Explanation:

5 0
2 years ago
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