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TiliK225 [7]
2 years ago
8

1 When a chemical reaction occurs A. the substances involved do not mix together and maintain their original properties. B. the

properties of the substances that are produced are identical to the properties of the original substances. C. the substances involved mix together but maintain their original properties. D. the proberties of the substances that are produced are different from the properties of the original substances.
Chemistry
1 answer:
nlexa [21]2 years ago
6 0

Answer:

D

Explanation:

The proberties of the substances that are produced are different from the properties of the original substances.

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A chemist must dilute 34.3mL of 1.72mM aqueous calcium sulfate solution until the concentration falls to 1.00mM. He'll do this b
EastWind [94]

Answer:

58.9mL

Explanation:

Given parameters:

Initial volume  = 34.3mL    = 0.0343dm³

Initial concentration  = 1.72mM   = 1.72 x 10⁻³moldm⁻³

Final concentration  = 1.00mM = 1 x 10⁻³ moldm⁻³

Unknown:

Final volume  =?

Solution:

Often times, the concentration of a standard solution may have to be diluted to a lower one by adding distilled water. To find the find the final volume, we must recognize that the number of moles of the substance in initial and final solutions are the same.

   Therefore;

              C₁V₁  =  C₂V₂

where C and V are concentration and 1 and 2 are initial and final states.

        now input the variables;

                      1.72 x 10⁻³ x  0.0343 = 1 x 10⁻³  x V₂

                        V₂ = 0.0589dm³ = 58.9mL

         

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How many single covalent bonds can halogens form?
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Cloud [144]
<span>Fe(NO3)2
The NO3 part is a poly-atomic ion with total charge -1.
This is because Fe has a +2 charge and two NO3's with a -1 charge will balance out to 0.
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So to find N, we just need an oxidation number that balances out with 3(-2) to get -1 (the total charge of the ion)</span>
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Other than exercises, what other factors do you think influences breathe/minute? <br>why?​
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Answer:

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Explanation:

5 0
3 years ago
Read 2 more answers
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