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4 years ago

Which of the following is an anion? A. O2- B. Mg2+ C. Al3+ D. H

1 answer:

3 0

Anions are ions that have a negative charge. Its charge is what we call as valence electrons.
The charge on the ion is written as a superscript after the element symbol.
You can predict the negative charge on an ion by looking at the group number for the atom.
The charge for representative elements is typically equal to the group minus eight.
Therefore, the anion among the choices is letter A which is $O^{2-}$ .
Oxygen is in group 6A. The negative charge is 6 - 8 = 2. The symbol is $O^{2-}$ with the charge written as a superscript.

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Describe the structure of the beryllium atom. In your answer make reference to the number of sub-atomic particles and where they

dusya [7]

Answer:

The nucleus consists of 4 protons (red) and 5 neutrons (orange). Four electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P."

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3 years ago

How would you monitor the progress of a neutralization reaction? Question 2 options: We will use a funnel to separate the solid

natita [175]

Answer:

We will use an acid-base indicator to see changes in colour depending on the pH

Explanation:

The pH changes during a titration, so you could use an acid-base indicator to follow the changes in pH.

A is wrong. An acid-base titration does not usually form a solid, and it would be impractical to isolate a solid with a funnel.

B is wrong. There are no changes in mass.

C is wrong. Any changes in temperature would be too small to measure precisely with an ordinary thermometer.

7 0

3 years ago

( HELP) The following system is at equilibrium. In which direction (right or left) will the equilibrium position shift with the

Alex Ar [27]

a) right

b) left

c) left

d) right

e) right

f) no effect

d) left

Explanation:

We have the following chemical reaction:

3 NO (g) ⇔ N₂O (g) + NO₂ (g) + 154.9 kJ

a) right, because by lowering the temperature you remove the heat generated by the reaction, and the reaction is able to generate more heat with the reaction proceeding from left to right.

b) left, because by increasing the temperature you add heat to the reaction and by doing so the reaction from right to left will be promoted.

c) left, increasing the concentration of N₂O the equilibrium will shift to left in order to consume the N₂O added.

d) right, increasing the concentration of NO the equilibrium will shift to right in order to consume the NO added.

e) right, decreasing the concentration of N₂O the equilibrium will shift to right in order to produce the removed N₂O.

f) no effect, adding a catalyst will not shift the equilibrium position, it will only modify the time in which the equilibrium is achieved and the energy required to achieve the equilibrium state.

g) left, by increasing the volume the equilibrium will shift to the part where more moles are produced (there are 3 moles on left side while in the right side there are 2 moles).

Learn more about:

Le Chatelier Principle

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8 0

4 years ago

Help please

Mars2501 [29]

Answer:

electron cloud charge of manganese=-5

Explanation:

atomic number=number of elecron +neutron number

DATA

Neutron NO.=30

atomic NO.=25

e=?

A=e+n

25=e+30

e=25-30

e= -5

6 0

3 years ago

The vapor pressure of a solution will ______ and the freezing point will _______ with a(n)_____ in the amount of dissolved solut

Marina86 [1]

The vapor pressure of a solution will decrease and the freezing point will decrease with an <span>increasing</span> in the amount of dissolved solute. So the answer is third option.

7 0

3 years ago

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