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nasty-shy [4]
4 years ago
11

Describe how to determine when a chemical reaction is occurring ?

Chemistry
1 answer:
Norma-Jean [14]4 years ago
8 0

Explanation:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

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3 years ago
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An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. what are its atomic number, atomic mass, and net charge?
Murrr4er [49]

Answer:

Z=26, A = 56, charge +3.

Explanation:

The atomic number is represented by Z. Is equal to the total number of protons that the atom has.  Z=26.

The atomic mass is represented by A. The number results from the total sum of protons and neutrons of an atom.  Both particles have a weight of 1 uma, are in the nucleus and give the mass to the atom.

Mass number (A) = atomic number (Z) + number of neutrons (N)

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The net charge of the atom can be calculated by subtracting the negative charges from the positive ones. The positive charges come from the protons and the negative ones from the electrons.

26-23=3

This iron ion has a positive charge +3.

6 0
3 years ago
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How might the structure of an atom be modeled
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