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Deffense [45]
2 years ago
15

Is it necessary to prepare sodium extract to detect nitrogen in urea ?​

Chemistry
1 answer:
Vilka [71]2 years ago
7 0

Answer:

I think No

Explanation:

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Nucleosynthesis began when _____ and ended when _____
lutik1710 [3]
<h2>Nucleosynthesis.</h2>

Explanation:

A. the Big Bang occurred; the Big Crunch occurred

Nucleosynthesis is the process by which new atomic nucleus are formed from pre-existing protons and neutrons.

According to cosmic theories, the nucleosythesis began one minute after the occurrence of Big bang and will end with the big Crunch.

The Big bang theory describes all the processes by which the universe came into existence while the big crunch theory explains how universe will come to an end.  A

5 0
3 years ago
Differences between hypothesis and theory​
Sphinxa [80]

Answer:

A hypothesis is either a suggested explanation for an observable phenomenon, or a reasoned prediction of a possible causal correlation among multiple phenomena. In science, a theory is a tested, well-substantiated, unifying explanation for a set of verified, proven factors.

Explanation:

He I hope this helps and hope I can brainliest answer

7 0
3 years ago
Read 2 more answers
Which of the following is smaller than the atomic radius of beryllium? a. the ionic radius of beryllium b. the atomic radius of
slamgirl [31]
The best quality answer I would say that it is cC
6 0
3 years ago
8. Which of the following statements about noble gases is correct?
Tanya [424]

Answer:

C.

Explanation:

Noble gases are stable and already have a full outter shell therefore don't tend to lose or gain any electrons.

8 0
3 years ago
How many acetate ions are formed when three formula units of zinc acetate dissociate?
jeyben [28]
A formula unit is the same as the empirical formula of a compound or an ionic molecule. It is the lowest ratio of the atoms in the compound or ion. Zinc acetate ions dissociates into zinc ions and acetate ions. The dissociation reaction is expressed as follows:
Zn(O2CCH3)2 = Zn2+ + 2(O2CCH3)1-

We determine the amount of acetate ions produced as follows:

Moles Zn(O2CCH3)2 = (3 formula units Zn(O2CCH3)2) ( 1 mol / 6.022x10^23 formula units) = 4.98x10^-24 mol Zn(O2CCH3)2
moles (O2CCH3)1- = 4.98x10^-24 mol Zn(O2CCH3)2 ( 2 mol (O2CCH3)1- / 1 mol Zn(O2CCH3)2 ) = 9.96x10^-24 mol (O2CCH3)1-
# of acetate ions = 9.96x10^-24 mol (O2CCH3)1- ( 6.022x10^23 ions / 1 mol (O2CCH3)1-) = 6 acetate ions
3 0
3 years ago
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