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3 years ago

6. What are two uses for nonmetals?

1 answer:

5 0

Uses of nonmetals in our daily life: Oxygen which is 21% by volume helps in the respiration process.

Nonmetals used in fertilizers: Fertilizers contain nitrogen.

Nonmetals used in crackers: Sulphur and phosphorus are used in fireworks.

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Which has the strongest intermolecular bonds? liquid gas solid water

Delicious77 [7]

It would be solid
hope this helps

3 0

4 years ago

How do you determine if and ion has a noble-gasconfiguration?

Soloha48 [4]

Explanation:

Noble gas configuration is defined as the configuration which contains completely filled orbitals.

For example, oxygen atom when gain two electrons then it forms oxygen ion ( $O^{2-}$ ).

Atomic number of oxygen atom is 8 and so, its number of electrons will also be 8. But when it gain two electrons then it has total 10 electrons. Hence, electronic configuration of $O^{2-}$ is as follows.

$1s^{2}2s^{2}2p^{6}$

Since, there are completely filled orbitals in an $O^{2-}$ ions. Therefore, it means this ion has a noble-gas configuration.

Thus, we can conclude that any specie which shows completely filled orbitals will have noble-gas configuration.

3 0

4 years ago

An atom is said to be in an excited state when it possesses more energy than when it is in its

MrRa [10]

Answer:

True!

Explanation:

8 0

3 years ago

Read 2 more answers

The valency of both Oxygen and magnesium is 2 give reason

lidiya [134]

Answer:

the valency of an element is its combining capacity that is the number of electrons it requires to lose, gain or share in order to become neutral.

[ An element can become neutral if it completes it's octet. That is if an element has 8 electrons in it'd outermost shell then it is considered neutral ]

The valence of Magnesium is 2 because it requires to lose 2 electrons to become neutral.

whereas, the valence of Oxygen is 2 because it needs to gain 2 electrons to become stable.

Hence they both have the same valence.

One may say that oxygen's valence is -2 while that of Magnesium is + 2. It's meaning is still the same but "-" sign indicates that oxygen will be gaining electrons in the process of becoming stable.

7 0

3 years ago

To determine the molecular weights of the acid, a student dissolved a pure sample (400.0 mg) in a water to a total volume of 100

klasskru [66]

Answer:

83.86g/mol is the molecular weight of the acid

Explanation:

Molecular weight is the ratio of mass in grams and moles present. That means we need to determine the mass in grams (400.0mg = 0.400g) and the moles of the acid that can be detemined by using its reaction with NaOH:

Moles acid:

First, we need to assume the acid is a monoprotic acid (Only 1 proton is acid and reacts with a base).

when the acid, HX, reacts with NaOH there is produced:

HX + NaOH → H₂O + NaX

Where 1 mole of HX reacts per mole of NaOH. That means the moles at the endpoint of NaOH = Moles of HX:

Moles NaOH:

15.90mL= 0.01590L * (0.0750mol / L) = 1.193x10⁻³ moles of NaOH = Moles of HX are present.

The acidic solution was diluted to 100.0mL but only 25.00mL were taken, that is:

25.00mL / 100.00mL = 1/4 of the acid was titrated.

And moles of HX in the original solution are:

1.193x10⁻³ moles of HX * 4 = 4.77x10⁻³ moles of HX

It is multiplied by 4 because the real amount of acid is 4 times the titrated amount.

Thus, molecular weight is:

0.4000g / 4.77x10⁻³ moles of HX =

<h3>83.86g/mol is the molecular weight of the acid</h3>

8 0

3 years ago