Chapter 2 Flashcards

1
Q

Atomic mass unit

A

(amu) (u) (Dalton) (Da)
* It’s an extremely small mass we use to talk about atoms
* It’s equal to 1/12 of the mass of one 12C atom
* It’s equal to 1.6605 x 10−24 g

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2
Q

Molecular compounds have an average formula mass (or molecular mass)

A

It is equal to the sum of the average atomic masses of all its atoms

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3
Q

Ionic compounds also have an average formula mass (not molecular mass)

A

It is equal to the sum of the average atomic masses of all the atoms of its
formula

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4
Q

1 mole ( Avogadro’s number (NA) ) =

A

= 6.022 x 1023

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5
Q

The unit of molarity is

A

mol/L or M (molar)

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6
Q

PPM=

A

mass solute/mass solution ∗ 10^6 ppm

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7
Q

PPB=

A

mass solute/mass solution ∗ 10^9 ppm

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8
Q

Density is

A

the ratio of the mass of a substance to the volume occupied by that mass

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9
Q

All substances tend to expand or contract depending on the temperature
Therefore..

A

density depends on the temperature

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