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Kryger [21]
3 years ago
14

Which of the following is not a natural change to the envlronment? drought , flood, disease ranching​

Chemistry
2 answers:
Deffense [45]3 years ago
4 0

Answer:

Disease ranching

Explanation:

Floods and Droughts are caused by the enviorment. Diseases are but a product and don't  affect the enviorment.

Naddika [18.5K]3 years ago
3 0

Answer:

disease ranching is not a natural change to the environment .

Explanation:

This all happen because of human activities

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Which metal atoms can form ionic bonds by losing electrons from both the outermost and next to outermost principal energy levels
RoseWind [281]

Full question options;

(Fe, Pb, Mg, or Ca)

Answer:

Iron - Fe

Explanation:

We understand tht metals pretty much form bonds by losing their valence (outermost electrons). But this question specifically asks for metals that lose beyond their outermost electrons; next to outermost principal energy levels.

Pb, Mg, and Ca only lose their outermost electrons to form the following ions;

Pb2+, Mg2+, and Ca2+.

This is because their ions have achieved a stable octet configuration - the dreamland of atoms where they are satisfied and don't need to go into reactions again.

Iron on the other hand has the following electronic configurations;

Fe:  [Ar]4s2 3d6

Fe2+:  [Ar]4s0 3d6

Fe3+:  [Ar]4s0 3d5

This means ion can lose both the ooutermost electrons (4s) and next to outermost principal energy levels (3d). So correct option is Iron.

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3 years ago
Most of the high-level radiation associated with nuclear energy is
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Waste materials, mining and transportation of radioactive fuels, radiation emissions from nuclear sites
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What is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge?
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proton is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge.

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3 years ago
In testing the effectiveness of an antacid compound, 20.0g of Hydrochloric Acid is mixed with 28.0g of Magnesium Hydroxide. Will
BartSMP [9]

Answer:

Base Mg(OH)2 does neutralise the acid and is 12g in excess.

Explanation:

2HCL +Mg(OH)2 -> MgCl2 + 2H20

2 * 36.458 g of HCL react with  58.319 g of  Mg(OH)2 to neutralise it.

72.916 HCl reacts with  58.319 g of the base.

So 20 g HCl reacts with  (58.319/72.916) * 20 = 16g.

There are 28 g of Mg(OH)2 so the base does neutralise all the acid.

The Mg(OH)2 is 28 - 16 = 12 g in excess.

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