1 - Stoichiometry Flashcards

1
Q

atom economy

A

a measure of the amount of starting materials that become useful products.

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2
Q

chemical element

A

a neutral substance that cannot be broken down into simpler substances using chemical methods

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3
Q

compound

A

a pure substance formed when two ore more chemical elements are chemically bonded together in fixed ratios

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4
Q

exothermic

A

release energy

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5
Q

endothermic

A

absorb/ require energy

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6
Q

sublimation

A

changing from solid to gas

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7
Q

deposition

A

changing from gas to solid

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8
Q

pure substance

A

an element or compound that has a definite and constant composition

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9
Q

mixture

A

a physical combination of pure substances which has no definite or constant composition e.g. homogeneous, heterogeneous. It can be separated into its pure components through filtration (seperate from liquid or gas), distillation (using different boiling points) and various forms of chromatography.

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10
Q

homogeneous mixtures

A

all the components are in the same phase

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11
Q

heterogeneous

A

the components are is different phases

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12
Q

mole

A

specific amount of a substance

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13
Q

Avogadro’s constant

A

is the number of atoms in 12g of Carbon-12

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14
Q

empirical formula

A

shows the simplest whole number ratio of atoms of each element in a particle of the substance

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15
Q

molecular formula

A

shows the actual number of atoms of each element in a molecule of the substance

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16
Q

theoretical yield

A

maximum amount of a product that could be formed according to the balanced equation

17
Q

experimental yield

A

actual amount of product obtained when the experiment is performed

18
Q

percentage yield

A

experimental yield divided by theoretical yield as a percentage