Explain how do the octect forms in cations and anions

Answers

Answer 1

Answer:

Answer:

Explanation:

-Octet forms when the valence electrons are gained, lost or shared.

-In order to become stable, which has 8 valence electrons (octet), nonmetal groups such as group 17, needs to gain 1 more electron to become 8/ octet.

When gaining that 1 electron, group 17 elements become negative ion or anions

-For metal groups such as group 1, they need to lose that 1 electron to become stable. When they lose that 1 electron, they become positive ion which is cation.

Hope this helps

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The supercontinent that existed about 200 million years ago was named

Answers

This was Pangaea! (was named like this in 1912)

It started existing around 300 million years ago and started falling apart around 175 million years ago.

Answer:

Pangaea

Explanation:

Quartz, which contains one silicon atom and two oxygen atoms per formula unit, is the second-most-common mineral on Earth after feldspar. It is used as a gemstone, as well as in pressure gauges, oscillators, resonators, wave stabilizers, heat-ray lamps, and prismastic lenses, and in the manufacture of glass, paints, abrasives, and precision instruments such as watches. What is the chemical formula for quartz?

Answers

The chemical formula for quartz is SiO_2

The chemical formula for quartz is SiO_2, which represents one silicon atom and two oxygen atoms in each formula unit.

Quartz is composed of silicon (Si) and oxygen (O) atoms bonded together in a specific arrangement. Its chemical formula, SiO2, represents this composition.

In quartz, each silicon atom is bonded to two oxygen atoms, and each oxygen atom is bonded to one silicon atom. This arrangement forms a three-dimensional network structure, making quartz a crystalline mineral.

The chemical formula SiO_2 provides a precise representation of the elements and their ratios in quartz.

Silicon and oxygen are the two elements that make up the mineral, and they are combined in a 1:2 ratio, meaning that for every silicon atom, there are two oxygen atoms.

This ratio is essential for understanding the stoichiometry and structure of quartz.

Quartz has various applications due to its unique properties, such as its hardness, transparency, and ability to transmit certain wavelengths of light, making it valuable in electronics, optics, and various industrial processes.

Learn more about Chemical formula for quartz here:

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The normal pH of surface sea water is _____. 5.0 6.0 7.0 9.0

Answers

Answer: Option (d) is the correct answer.

Explanation:

It is known that sea water contains a large amount of common salt, that is, sodium chloride (NaCl). This salt is basic in nature.

Since, it is also known that species which have pH equals to 7 are basic in nature. Species which have pH less than 7 are acidic in nature and species which have pH greater than 7 are basic in nature.

Hence, due to the presence of common salt in sea water its surface is basic in nature.

Therefore, we can conclude that the normal pH of surface sea water is 9.0.

The PH level of the surface of the water is 9.0
Hope this helps

When an individual has an energy surplus, he or she stores the extra energy as: A. nucleic acids. B. lipids. C. None of the answer options is correct. D. carbohydrates. E. proteins.

Answers

Answer: B. lipids

Explanation:

When an individual has an energy surplus, the extra energy is stored in the body as lipids. Lipids are used for energy in the long term

Which equation represents a spontaneous transmutation

Answers

The correct answer is:
37/20Ca --> 37/19K + 0/+1e

Explanation:
Transmutation, conversion of 1 element into another. A transmutation entails an amendment within the structure of atomic nuclei and thus is also induced by an action (q.v.), like nucleon capture, or occur ad libitum by decay, like disintegration and disintegration(qq.v.)

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

Answers

The answer is 5 meters.

The illuminance on a surface (E) is equal to the light intensity (I) divided by the square distance from the light source (d):
E = I ÷ d² [=] candela/ square meters = lux.
The unit of the illuminance is lux.

So, it is given:
E = 4 lux
I = 100 candelas
d = ?

If:
E = I ÷ d²
Then
d² = I ÷ E
⇒ d² = 100 ÷ 4
⇒ d² = 25

If we put both sides of the equation under the square root, then:
√d² = √25
⇒ d = 5 meters.

Therefore, the surface is 5 meters far from the light source.

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Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)Starting with with 50.0 grams of Pb(NO3)2 and 30.0 grams of NaI:A. What is the limiting reagent?B. How many grams of the excess reactant remains?C. How many grams of each product is formed? D. If 12 grams of NaNO3 actually formed in the reaction, what is the percent yield of this reaction?

In a sealed gas-liquid system at constant temperature, eventually...?there will be no more evaporation.the rate of evaporation equals the rate of condensation.the rate of condensation decreases to zero.the rate of condensation exceeds the rate of evaporation.