Important Chemistry Formulas

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11 Terms

1

Mass

The total number of protons and neutrons in an atom.

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2

Average atomic mass

Calculated using the formula: (% abundance * atomic mass of isotope) + (% abundance * atomic mass of isotope).

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3

Density

The mass of an object divided by its volume, represented as density = mass/volume.

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4

Percent error

A measure of how inaccurate a measurement is; calculated as |Measured value - Accepted value| / Accepted value * 100.

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5

Half-life

The time required for half of the original mass of a substance to decay.

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6

m2

The mass remaining after a certain time period has elapsed in the context of half-life calculations.

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7

m1

The original mass of a substance before decay.

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8

t2

The time elapsed during the decay process.

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9

t1

The half-life of the substance.

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10

Half life formula

m2= m1(1/2)(t2/t1)

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11

How many orbitals and electrons are in the s, p, d, and f regions?

s: 1 orbital, 2 electrons.
p: 3 orbitals, 6 electrons.
d: 5 orbitals, 10 electrons.
f: 7 orbitals, 14 electrons.

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