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Softa [21]
3 years ago
5

How many electrons are needed in the outer energy levels of most atoms to be chemically stable?

Chemistry
1 answer:
Tatiana [17]3 years ago
3 0
Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule. Some atoms can be stable with an octet even though their valence shell is the 3n shell, which can hold up to 18 electrons.
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Using what you have learned about the three forms of writing chemical equations, classify each of the presented equations as eit
suter [353]

Explanation:

Molecular equation: Chemical equation in which molecular formula of reactants and products are written

Complete ionic equation:Chemical equation in which ionic from if reactants reactants and products are written along with spectator ions (ions present on both sides of equation).

Net ionic equation :Chemical equation in which only ions of those reactant are written which giving product without  spectator ions (ions present on both sides of equation).

(a) Ca^{2+}(aq) + SO_4^{2-}(aq)\rightarrow CaSO_4(s)

net ionic equation.

(b) CuSO_4(aq) + 2KOH(aq)\rightarrow Cu(OH))_2(s) + K_2SO_4(aq)

Molecular equation

(c)Ba^{2+} (aq) + SO_4^{2-}(aq)\rightarrow BaSO_4(s)

Net ionic equation.

(d) Ag^+(aq) + NO_{3}^-(aq) + I^-(aq)\rightarrow AgI(s) + NO_{3}^-(aq)

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3 0
3 years ago
2. Sate the method of collecting gases that are<br>ii). Lighter than ai<br>i). denser than air​
dybincka [34]

Answer:

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ii) Downwards delivery

Explanation:

The methods used in the collection of gases are quite different depending on the state of the gas. The solubility and density of gases are the factors that determine the method of collection to be used.

Upwards delivery is used to collect gases that are soluble in water and lighter compared to air. Examples of these kind of gases include; Cl2 and SO2

Downwards delivery is used to collect gases that are soluble in water and denser than air. An example of this kind of gas is ammonia gas, NH4.

3 0
3 years ago
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If you want to stop the reaction at Ketone stage then you are required to use another mild reactive organometallic compound. In our case we will use Organocuprates. Organocuprates are also known as Gilman Reagents. These reagents does not add to ketones, aldehydes and esters but they can add to acid halides to produce Ketones.

8 0
3 years ago
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tiny-mole [99]

(I leave off the x10^23 because they both will divide out)    Use your per

7 0
2 years ago
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adoni [48]
The mass of the solid product of the reaction is determined by weighing.
6 0
3 years ago
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