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marusya05 [52]
3 years ago
5

Please select the word from the list that best fits the definition

Chemistry
2 answers:
Vera_Pavlovna [14]3 years ago
6 0

I believe it is c

Explanation:

because if u think about it and also do some research you would see that the circulatory system is a strong part of your body which can help u through natural defences if this sounds weird it's all in research but if it ain't c dont blame me for ruining your life- lol but yeah I think its c

AveGali [126]3 years ago
3 0

Answer:

I choose D option because may be it's correct

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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}

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}

6 0
3 years ago
Evidence of a chemical change would be
Elodia [21]
D- Rusting car fender
4 0
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Given the balanced equation what is the reaction ?
VMariaS [17]

This is a double replacement reaction; the ions switch twice.

3 0
3 years ago
Balance the equations​
bearhunter [10]

1. 2 H2 + O2 = 2 H2O

2. 6 K + B2O3 = 3 K2O + 2 B

3. 10 Na + 2 NaNO3 = 6 Na2O + N2

6 0
3 years ago
46. The number of orbitals in the sub-levels increases by even numbers.<br> a. TRUE<br> b. FALSE
frosja888 [35]

Answer:

It's true.

Explanation:

In sub-energy level : number of orbitals

  • s : 2
  • p : 6
  • d : 10
  • f : 14

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