CHEM | LESSON 2 Flashcards

1
Q

one or more reactants is converted to one or more products.

A

Chemical reaction

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2
Q

alters the physical state of a substance without changing its composition.

A

Physical change

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3
Q

a chemical reaction) converts one substance into another.

A

Chemical change

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4
Q

Chemical reactions involve:

A

Breaking bonds in the reactants (starting materials)
Forming new bonds in the products

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5
Q

Burning in air

A

Combustion

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6
Q

The loss of electrons.

A

Oxidation

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7
Q

The loss of electrons.

A

Reduction

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8
Q

Any reaction in which electrons are transferred from one species to another.

A

Oxidation-reduction redox reaction

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9
Q

The gain of oxygen and/or loss of hydrogen.

A

Oxidation

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10
Q

The gain of oxygen and/or loss of hydrogen.

A

Reduction

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11
Q

The process by which living organisms use O2 to oxidize carbon- containing compounds to produce CO2 and H2O. The importance of these reactions is not the CO2 produced, but the energy released.

A

Respiration

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12
Q

The oxidation of iron to a mixture of iron oxides

A

Rusting

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13
Q

The oxidation of colored compounds to products which are colorless.

A

Bleaching

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14
Q

In all cases, the reaction taking place in a battery is a redox reaction.

A

Batteries

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15
Q

The sum of the atomic weights in atomic
mass units (amu) of all atoms in a compound’s formula.

A

Formula weight

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16
Q

can be used for both ionic and molecular compounds; it tells nothing about whether a compound is ionic or molecular.

A

Formula weight

17
Q

should be used only for molecular compounds.

A

Molecular weight

18
Q

The amount of substance that contains as many atoms, molecules,
or ions as there are atoms in exactly 12 g of carbon-12.

19
Q

The number of formula units in a mole is known as

A

Avogadro’s number

20
Q

The number of formula units in a mole is known as

A

6.02214199 x 10^23

21
Q

The formula weight of a substance expressed
in grams.

A

Molar mass

22
Q

The study of mass relationships in chemical
reactions.

A

Stoichiometry

23
Q

The reagent that is used up first in a
chemical reaction.

A

Limiting reagent

24
Q

The mass of product formed in a chemical
reaction and recovered in the laboratory.

A

Actual yield

25
The mass of product that should form according to the stoichiometry of the balanced chemical equation.
Theoretical yield
26
Actual yield divided by theoretical yield times 100..
Percent yield