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chemistry > moles/stoichiometry > Flashcards

moles/stoichiometry Flashcards

1
Q

pure substances

A

elements or compounds

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2
Q

elements

A

cant be broken down chemically, made up of atoms with same atomic numbers

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3
Q

compounds

A

chemically bonded, and CAN be broken down chemically

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4
Q

empirical formula

A

can be calculated from percent composition

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5
Q

molecular formula

A

calculated from the empirical formula

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6
Q

binary compounds

A

made up of 2 elements (ionic or covalent)
- ionic, metallic goes first
- covalent

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7
Q

where does metallic go in a binary compound?

A

first in a ionic compound

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8
Q

where does an element go in a binary compound?

A

first less electronegative element

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9
Q

binary acids

A

hydrogen + some metal

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10
Q

structural formula

A

physical way to show atoms

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11
Q

what do chemical reactions show?

A

conservation of energy, mass, and charge

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12
Q

what is a chemical reaction?

A

reactants to products

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13
Q

what do balanced chemical equations show?

A

conservation of atoms

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14
Q

what are the coefficients in a balanced chemical used for?

A

find mole ratios in a reaction

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15
Q

gram formula mass

A

G

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16
Q

formula mass

A

amu

17
Q

what are the types of chemical reactions?

A

synthesis, decomposition, single replacement, double replacement

18
Q

synthesis

A

two or more substances reacting to form a product

19
Q

decomposition

A

breaks up

20
Q

single replacement

A

ONE element or compound replaces another one

21
Q

double replacement

A

cations and anions switch places

22
Q

cations

A

positive ions

23
Q

anions

A

negative ions

24
Q

percent composition

A

tells you by mass what percent of each element is in a compound

25
Q

moles to grams

A
  1. find gfm/molar mass
  2. gfm x number of moles
26
Q

percent composition

A

(og mass x subscript of elements)/gfm mass X 100

27
Q

grams to moles

A

grams/molar mass

28
Q

mole ratio

A

moles given X coefficient of desired/coefficient of given

chemistry (3 decks)

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