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FromTheMoon [43]
3 years ago
12

Water containing more than 3.0 grains of dissolved solids per gallon is considered to be hard [1 grain (gr) = 64.8 mg]. So, if a

kettle contains 18 gal of tap water, which is allowed to evaporate. The solid material left behind has a mass of 1.7 g. Is such tap water considered to be hard?
Chemistry
1 answer:
Anika [276]3 years ago
6 0

Answer:

  • <em><u>Yes, such tap water is considered to be hard.</u></em>

Explanation:

The <em>solid material left behind</em>, after the <em>18 gal of tap water</em> was <em>evaporated,</em> is the amount of dissolved solids in that quantity of water.

You must convert the amount in grams (1.7g) into grains:

  • 17.g × 1,000mg/g × 1 gr/64.8mg = 262.34 gr

That is in 18 gallons. Then, divide by 18 gal to obtain the number of grains dissolved per gallon:

  • 262.34gr / 18 gal ≈ 15 gr per gallon.

That is much greater than 3.0 grains per gallon; thus,<em> such tap water is considered to be hard.</em>

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Answer:

a,b,e,f,g

Explanation:

Hydrogen bonding is an intermolecular force of attraction between two molecules. It is a special type of dipole-dipole attraction.

In hydrogen bonding, the hydrogen on one molecule binds with an electronegative atom on another molecule usually oxygen, nitrogen and fluorine.

The simple electrostatic attraction leads to strong intermolecular interaction between two molecules.

 For the formation of hydrogen bond, a hydrogen atom must be bonded to more electronegative specie usually N, O and F

  In H₂O and H₂O₂ ;   hydrogen bonds with Oxygen

       CH₃NH₂; hydrogen is attached to nitrogen

       HF; hydrogen is attached to fluorine

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7 0
3 years ago
A 12.630 g milk chocolate bar is found to contain 8.315 g of sugar. part a part complete how many milligrams of sugar does the m
kolezko [41]
Answer:
A 12.630 bar of chocolate contains 8315 milligrams of sugar

Explanation:
From the basics of conversion, we can find that:
1 gram is equal to 1000 mg
Using cross multiplication, we can find how many milligrams are present in 8.315 grams as follows:
1 gram .............> 1000 mg
8.315 grams ....> ?? mg
amount in milligrams = (8.315*1000) / 1 = 8315 milligrams

Hope this helps :)
5 0
3 years ago
A cube of an unknown metal measures 0.250 cm on one side. The mass of the cube is 0.134 g. Which of the following is most likely
rosijanka [135]

Answer:

8.58 g/cm3

Explanation:

density = mass / volume

be attention that the question gives u the length of

one side of the cube so u should calculate the volume

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 V of cube = a 3= axaxa

                 = 0.250 x0.250 x0.250

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 2nd step

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True because evryone reacts a different way
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3 years ago
Cc
zzz [600]

Answer:

You should be posting this question under the biology tab, but here's the answer nonetheless.

a. 25% (if the woman is Ce)

c. 0% (if the woman isn't Ce)

5 0
3 years ago
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