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iogann1982 [59]
2 years ago
10

Which of the following is used in pencils?

Chemistry
2 answers:
goldenfox [79]2 years ago
8 0

Answer:

the first is graphite........

Mamont248 [21]2 years ago
3 0

Answer:

1st answer:  A. Graphite

2nd answer:  B.  Mercury

Explanation:

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What is the Equation of Reduction in Mg+F2 gives MgF2, I WILL MARK YOU AS BRAINLIST
skad [1K]

Answer:

Mg+F2= Mgf2

Explanation:

F 2 is an oxidizing agent, Mg is a reducing agent. ; Pale-yellow to greenish gas with a pungent, irritating odor.

5 0
2 years ago
A solution contains the ions Ag , Pb2 , and Ni2 . Dilute solutions of NaCl, Na2SO4, and Na2S are available to separate the posit
Delicious77 [7]

Answer:

The solutions should be added in this order NaCl > Na2SO4 > Na2S

Explanation:

Silver is insoluble as a chloride, so the silver ions get precipitated on addition of chloride ion as silver chloride.  This means Ag+ would be removed the first.

So we will add NaCl in the first step.

The following reaction will occur.

Ag+ + Cl- → AgCl(s)

Both, Pb2 and Ni are soluble as chlorides. (lead chloride is soluble as a hot solution but will ppt when colder).

When we add Na2SO4, Pb2+ will get precipitated (because it's insoluble) as PbSO4 and Ni will remain soluble as NiSO4 is soluble in water.

The reaction that will occur is:

Pb^2+ + SO4^2- → PbSO4(s)

Nickel is insoluble as a sulfide. So when we will add Na2S, nickel will be precipitated as sulfide and be able to separate and be collected.

The solutions should be added in this order NaCl > Na2SO4 > Na2S

6 0
3 years ago
An atom of chlorine has several valence electrons in its
RUDIKE [14]
7 valence electrons in an atom

7 0
3 years ago
(4.2 x 10^8) + (2.6 x 10^6) *
hodyreva [135]

Answer:

4.226×10^8

Explanation:

4.2 ×10^8+2.6×10^6=422600000

or 4.226×10^8

5 0
3 years ago
Convert 1.140atm to kPs
MissTica
R = 8.314 L kPa<span>. R = 62.4 L 

</span>
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3 years ago
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