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4 years ago

Which of the following ions would represent the ion of an element from Group 2A?

2 answers:

8 0

The best and most correct answer among the choices provided by the question is the fourth choice or letter D.
A2+ would represent the ion of an element from Group 2A

I hope my answers has come to your help. God bless and have a nice day ahead!

Lina20 [59]4 years ago

3 0

An element belongs to particular group is related to the number of electrons present in the outer shell of the atoms. In given case, group is 2, therefore, number of valence electrons is 2 implies it has ability to lose two electrons to get +2 charge.

$A\rightarrow A^{+2}+2e^{-}$

Therefore, ion formed after removal of two electrons is $A^{2+}$ .

Hence, option (D) is the correct answer.

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What is an example of density? pls helppp

DanielleElmas [232]

Answer:

sruff that has to do wuth vikun=

Explanation:

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3 years ago

What is the pH of a solution that has a [H+] = 0.010 mol/L?

Serjik [45]

Answer:

pH = 2

A 0.010 M solution of hydrochloric acid, HCl, has a molarity of 0.010 M. This means that [H+] = 1 x 10-2 M. The pH of this aqueous solution of H+ ions is pH = 2

hope this helps :3

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5 0

2 years ago

If dr. john sutherland is correct, which of the following was necessary for inert carbon atoms to become part of the chemistry o

arlik [135]

It seems that you have missed the necessary options for us to answer this question so I had to look for it. But anyway, here is the answer. If Dr. John Sutherland is correct, the one that was necessary for inert carbon atoms to become part of the chemistry of earth is CYANIDE. Hope this helps.

8 0

4 years ago

What is 2 H2 + 1 O2 = 2 H2O balanced?

jeka57 [31]

Answer:

Yes, that is correctly balanced. 2 H2 + 1 O2 = 2 H2O is already balanced.

Explanation:

If you count up the number of hydrogen atoms and oxygen atoms on each side, you will see that they are equal:

2 H2 + 1 O2 (4 hydrogen and 2 oxygen) = 2 H2O (4 hydrogen and 2 oxygen).

3 0

3 years ago

How many liters of hydrogen gas I needed to react with CS2 to produce 2.5 L of CH4 At STP

olchik [2.2K]

Answer:

9.8 L

Explanation:

The reaction that takes place is:

4H₂(g) + CS₂(g) → CH₄(g)+ 2H₂S(g)

At STP, 1 mol of any gas occupies 22.4 L.

We calculate how many moles are there in 2.5 L of CH₄ at STP:

2.5 L ÷ 22.4 L/mol = 0.11 mol CH₄

Then we convert CH₄ moles into H₂ moles, using the stoichiometric coefficients of the reaction:

0.11 mol CH₄ * $\frac{4molH_2}{1molCH_4}$ = 0.44 mol H₂

Finally we calculate the volume that 0.44 moles of H₂ would occupy at STP:

0.44 mol * 22.4 L/mol = 9.8 L

8 0

3 years ago