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Vesnalui [34]
2 years ago
12

Difine the term compound​

Chemistry
1 answer:
AlexFokin [52]2 years ago
8 0

Answer:

Its when like two pure substances are like combined into one.

Explanation:

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Cardiovascular system

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What is A collection of waves called
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When waves act together, you talk about "interference". When they reinforce each other, it is "constructive interference". When they cancel each other, it is "destructive interference".
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Convert 678.92 cm into meters​
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Answer:6.7892 meters

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2 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

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

For ion with 27 proton, 32 neutrons and 25 electrons

Net charge = 27 - 25 = +2

Mass number = 27 + 32 = 59

Thus, the chemical symbol = Co^{+2}

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2 years ago
Why do we use commas after transition words?
ra1l [238]

Answer:

C - commas indicate a natural pause in the sentence

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