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3 years ago

Use a periodic table to complete the table below:

Chemistry

1 answer:

Aleksandr [31]3 years ago

6 0

Answer:

proton number of hydrogen :1

proton number of calcium : 20

number of electrons for fluorine : 9

number of electrons for iodine : 53

number of neutron hydrogen :0

number of neutron iodine : 74

number of neutron gold(Aurum) :118

Explanation:

to get the number of neutron by number of nukleon minus the number of proton..

gold is aurum

the number of nukleon u can get at the periodic table .. by looking at the biggest number.. thats all.. i hope u understanding my explanation :'D hhihi see ya

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Which is the formula for dinitrogen pentoxide?

nadya68 [22]

Answer:

N2O5

Explanation:

IUPAC ID: Dinitrogen pentoxide

Molar mass: 108.01 g/mol

Density: 1.64 g/cm³

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2 years ago

When a 0. 1 m aqueous solution of hydrocyanic acid, hcn, reaches equilibrium, the ph is measured to be 5. 20. using this informa

Sav [38]

When a 0. 1 m aqueous solution of hydrocyanic acid, HCN, reaches equilibrium, the ka for hydrocyanic acid is 3.969 x 10⁻¹⁰.

<h3>What is ka value?</h3>

It's the value of equilibrium constant for the dissociation of ions into a solution. The more the Ka value the more will be dissociation.

Ka = [H₃O⁺]² / [HCN] [H₃O⁺]

The pH is 5.20

-log [H₃O⁺] = 5.20

Putting antitlog both side.

The value will be 6.30 x 10⁻⁶

Ka = (6.30 x 10⁻⁶)² / 0.1 - 6.30 x 10⁻⁶

0.1 - 6.30 x 10⁻⁶ = 0.1

Ka = 3.969 x 10⁻¹⁰

Thus, the Ka value for hydrocyanic acid is 3.969 x 10⁻¹⁰.

To learn more about ka value, refer to the link:

brainly.com/question/2796803

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7 0

1 year ago

How would you prepare a 1 L solution of 3 M MgO?

oksano4ka [1.4K]

Answer: 175.35g

Explanation: A 3 M solution has 3 moles of solute per litre.

The mass of one mole of NaCl equals the MW of NaCl MW = 35.45 + 23 =58.45 g/mol

The mass of 3 moles is 58.45 g/mol ×3 mol=175.35 g NaCl or 200 g rounded to one sigfig.

8 0

3 years ago

Cells have a ______ ___________, a thin layer that controls what goes in and out of the cell.

Iteru [2.4K]

Answer:

cell membrane

Explanation:

3 0

2 years ago

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Draw the structure of the major organic product isolated from the reaction of 1-hexyne with sodium amide in liquid ammonia follo

77julia77 [94]

Answer:check explanation and attached file/picture

Explanation:

Alkynes are hydrocarbons and they are very acidic because of hybridization effect(the more acidic the s-character is, the more acidic it is going to be).

The reaction of 1-hexyne with sodium amide in liquid ammonia is a form of deprotonation 'reaction' to form acetylide. Due to the acidic nature of the terminal hydrogen atom, terminal alkynes do form metallic derivatives by the replacement of the terminal hydrogens. The equation of Reaction is given below.

C6H10 + NaNH2( in liquidNH3) ------------> C6H9Na + H-NH2.

The acetylide is a bae and a very good nucleophile.

The reaction is then followed by the addition of 1-bromobutane. This reaction is used for the production of longer chain alkynes. The equation of Reaction is attached in the picture.

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2 years ago

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