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4 years ago

100 points!! Brainliest if correct!!

Chemistry

2 answers:

irina [24]4 years ago

8 0

First look at the H (that is hydrogen) in the formula. There are 3. This would be right, but notice the 3 at the beginning of the formula. This coefficient tells you to multiply all values by 3. So you multiply the 3 hydrogen atoms by 3, which is 9.

Answer is C: 9

Virty [35]4 years ago

4 0

The answer is C.

While the Hydrogen atom symbol itself is labeled with 3, it is being multiplied by the coefficient of 3, giving us a total of 9 atoms.

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4 years ago

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3 years ago

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4 years ago

1. write the complete chemical symbol for the ion with 14 protons 15 neutrons and 18 electrons

motikmotik

Answer:

1. $Si^{-4}$

2. $Co^{+2}$

Explanation:

An ion is formed when an atom that is said to be neutral gains or losses electrons.

It is thought that a negative ion (anion) is produced as it gains electrons and a positive ion (cation) is formed when it loses an electron.

Atomic number is the total number of protons and electrons in a neutral atom.

From the information

Protons = 14

electron = 18

Net Charge = no of proton - no of electron

= 14 - 18 = -4

Mass number = 14 + 15 = 29

Thus, the chemical symbol = $Si^{-4}$

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3 years ago

Someone please help me

svetlana [45]

Answer: 72

Explanation: there is 48 teaspoons in a cup, take 48 then divide that by 2 u get 24 then u add 24 to 48 then u get 72

7 0

3 years ago

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