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miskamm [114]
4 years ago
11

How many neutrons does element X have if its atomic number is 22 and its mass number is 99?

Chemistry
1 answer:
Scrat [10]4 years ago
5 0
77.

To find the answer u have to subtract the atomic mass from the atomic number.
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13. Copper(II) chloride and silver acetate Acid/Base:
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Ba(OH)_2 -> Base

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15. HCl\hspace{0.1cm}+Mg(OH)_2->\hspace{0.1cm}H_2O\hspace{0.1cm}+MgCl_2

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HCl -> Acid

16.CH_3COOH\hspace{0.1cm}+LiOH->\hspace{0.1cm}H_2O\hspace{0.1cm}+CH_3COOLi

LiOH -> Base

CH_3COOH -> Acid

17.H_2SO_4\hspace{0.1cm}+NaOH->\hspace{0.1cm}H_2O\hspace{0.1cm}+NaHSO_4

NaOH -> Base

H_2SO_4-> Acid

18. H_2SO_4\hspace{0.1cm}+NaOH->\hspace{0.1cm}H_2O\hspace{0.1cm}+NaHSO_4

NaOH -> Base

H_2SO_4-> Acid

19.H_2SO_4\hspace{0.1cm}+NaHCO3->\hspace{0.1cm}H_2O\hspace{0.1cm}+CO_2+\hspace{0.1cm}Na_2SO_4

NaHCO_3-> Base

H_2SO_4-> Acid

20.H_3PO_4\hspace{0.1cm}+Zn(OH)_4->\hspace{0.1cm}H_2O\hspace{0.1cm}+Zn_3(PO_4)_4

Zn(OH)_4> Base

H_3PO_4-> Acid

21. HF\hspace{0.1cm}+Na_2SO_3->\hspace{0.1cm}H_2O\hspace{0.1cm}+NaF\hspace{0.1cm}+\hspace{0.1cm}SO_2

NaSO_2> Base

HF-> Acid

22.HCl\hspace{0.1cm}+Na_2SO_3->\hspace{0.1cm}H_2O\hspace{0.1cm}+NaCl\hspace{0.1cm}+\hspace{0.1cm}SO_2

NaSO_2> Base

HCl-> Acid

23.HCl\hspace{0.1cm}+Na_2S->\hspace{0.1cm}H_2S\hspace{0.1cm}+NaCl

Na_2S> Base

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24. NH_4Cl\hspace{0.1cm}+NaOH->\hspace{0.1cm}H_2O\hspace{0.1cm}+NaCl+{0.1cm}NH_3

NaOH> Base

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Explanation:

All acid-base reaction have the same products, H_2O and a salt. Whit this in mind the acids would the compounds that produces the hydronium ion (H^+) and the bases would be the compounds that produces the hydroxide ion (OH^-)

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Which of the following is the correct IUPAC name?
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Answer:

(C) 4-ethyl-2,2-dimethylheptane.

Explanation:

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  • A methyl group is a one-carbon substitute -CH₃ for an H atom on the backbone.
  • An ethyl group is a two-carbon substitute  -CH₂-CH₃ for an H atom on the backbone.
  • A propyl group is a three-carbon substitute -CH₂-CH₂-CH₃ for an H atom on the backbone.

Step two: check the structures and the names against the IUPAC rules.

There are many of these rules. Ones that apply here include:

  • The backbone shall be named after the longest chain of carbon atoms. There may be right angles but the chain needs to be continuous.
  • List the substitutes in alphabetical order (e.g,, ethyl, methyl, and propyl.)
  • Number the substitutes from the end that ensures the smallest number for the first substitute group that is encounter. If starting from both ends lead to the same number for the first group, check the second group.

Refer to the sketch attached.

<h3>(A)</h3>

Should start numbering from the other end.

<h3>(B) and (D)</h3>

The longest backbone contains seven carbon atoms.

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