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GAMSAT > CHM-1-Stoichiometry > Flashcards

CHM-1-Stoichiometry Flashcards

1
Q

Composition of Air

A

78% Nitrogen
21% Oxygen
1% Other Gases

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2
Q

What is Stoichiometry?

A

The calculation of the specific quantities of reactants and products in a reaction.

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3
Q

What is an empirical formula?

A

The simplest whole number ratio for a compound. E.g Hydrogen Peroxide (1:1 Ratio) would be ‘HO’

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4
Q

What is a molecular formula?

A

The exact number of the different atoms making up a molecule. E.g Hydrogen Peroxide (1:1 Ratio) would be H2O2.

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5
Q

What is the definition of Avagadro’s number?

A

The number of atoms in 12 grams of carbon’s most common isotope.

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6
Q

What is the value of Avagadro’s number?

A

6.02 x 10^23

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7
Q

A mole of atoms/molecules contains…

A

an Avagadro number of these particles.

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8
Q

What is the gram-atomic weight (GAW)?

A

The weight in grams of a mole of atoms of a given element.

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9
Q

What is the gram-molecular weight (GMW)?

A

The weight in grams of mole of molecules of a given compound.

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10
Q

Formula to calculate the number of moles for an element.

A

Moles = (Weight of sample [g] / GAW)

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11
Q

Formula to calculate the number of moles for a compound.

A

Moles = (Weight of sample [g] / GMW)

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12
Q

The GAW of any element is equal to…

A

Its atomic weight

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13
Q

What is amu?

A

Atomic Weight

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14
Q

What is a reactant?

A

A compound which initially combines or reacts in a chemical reaction

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15
Q

What is the number before compounds in a chemical equation and what do they represent?

A

The stoichiometric coefficient - The relative number of moles in a compound

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16
Q

The law of conservation of mass

A

The number of atoms of a given element remains constant during the process of a chemical reaction.

17
Q

The g/mol value of an element is the same value as the…

A

Atomic Mass

18
Q

What is OILRIG?

A

When talking about one or more electrons:
Oxidation Is Loss
Reduction Is Gain

19
Q

Give the oxidation numbers for:

Hydrogen
Oxygen
Alkali Metals
Alkaline Earth Metals
Aluminium
A 
\+1
-2
\+1
\+2
\+3
20
Q

Oxidation number for Group VIIA elements E.g Chlorine.

A

-1 However, it becomes +1 when combined with an element with higher electronegativity.

21
Q

If an element causes another element to have a decreased oxidation number in a reaction, it is known as…

A

A reducing agent

22
Q

What can be used as reducing agents?

A

Metals

23
Q

2 common oxidising agents

A

Halogens

Ozone (O3)

GAMSAT (11 decks)

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