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riadik2000 [5.3K]

3 years ago

14

Which statement is true concerning energy

1 answer:

slava [35]3 years ago

5 0

What are the statements ?

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What is one way to create a negative ion?

san4es73 [151]

Answer:

Burn beeswax candles. They clean the air, produce negative ions, and assist with allergy and asthma reduction. Run an indoor water fountain. The force or energy of falling water causes the neutral particles in air to split which frees electrons to attach to other air molecules resulting in negative ions.

Explanation:

8 0

3 years ago

In metallic bonds, the mobile electrons surrounding the positive ions are called a(n)

creativ13 [48]

It is called, Noble gas

5 0

3 years ago

How many grams of magnesium oxide remain after 18.50 g of magnesium oxide reacts with 30.3 g hydrochloric acid to produce magnes

mestny [16]

I believe that this is right

5 0

3 years ago

Lina20 [59]

Answer:i think its 6 what do you think

Explanation:

5 0

3 years ago

Express the concentration of a 0.0320 M aqueous solution of fluoride, F−, in mass percentage and in parts per million (ppm). Ass

denis23 [38]

Answer:

607 ppm

Explanation:

In this case we can start with the <u>ppm formula</u>:

$ppm=\frac{mg~of~solute}{Litters~of~solution}$

If we have a solution of <u>0.0320 M</u>, we can say that in 1 L we have 0.032 mol of $F^-$ , because the molarity formula is:

$M=\frac{mol}{L}$

In other words:

$0.0320~M=\frac{mol}{1~L}$

$mol=0.032~M*1~L=0.032~mol$

$1~L~of~Solution=0.0320~mol~of~solute$

If we use the <u>atomic mass</u> of $F$ (19 g/mol) we can convert from mol to g:

$0.0320~mol~F^-\frac{19~g~F^-}{1~mol~F^-}~=~0.607~g$

Now we can <u>convert from g to mg</u> (1 g= 1000 mg), so:

$0.607~g\frac{1000~mg}{1~g}=607~mg$

Finally we can <u>divide by 1 L</u> to find the ppm:

$ppm=\frac{607~mg}{1~L}=~607~ppm$

<u>We will have a concentration of 607 ppm.</u>

I hope it helps!

4 0

4 years ago