Chapter 1

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Chemistry

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32 Terms

1

Chemistry

The study of matter, its properties, the changes it goes through, and the energy that moves around.

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2

Matter

Anything that has mass and volume.

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3

Composition

Amounts of simpler substances that make up matter.

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4

Properties

Characteristics of substances.

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5

Solid

A state of matter with a fixed shape and volume.

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6

Liquid

A state of matter that has a moldable shape, conforms to the shape of its container, but has a fixed volume.

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7

Gas

A state of matter with no fixed shape and no fixed volume.

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8

Physical Properties

Characteristics that do not involve interactions with another substance, such as color and density.

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9

Chemical Properties

Characteristics that involve interactions with other substances, such as flammability and corrosiveness.

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10

Physical Change

A reversible change where the physical form changes but the composition does not.

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11

Chemical Change

A change that cannot be reversed by changing temperature.

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12

Energy

The ability to do work.

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13

Potential Energy

Energy due to the position of an object.

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14

Kinetic Energy

Energy due to the movement of an object.

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15

Total Energy

The sum of potential energy and kinetic energy.

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16

Lower Energy State

A state that is more stable.

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17

Temperature

A measure of how hot or cold one object is relative to another.

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18

Heat

The energy that flows from an object with a higher temperature to an object with a lower temperature.

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19

Temperature Conversion (K)

T(K) = T(C) + 273.15

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20

Temperature Conversion (C)

T(C) = T(K) - 273.15

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21

Temperature Conversion (F)

T(F) = 9/5 T(C) + 32

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22

Temperature Conversion (C from F)

T(C) = [T(F) - 32] 5/9

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23

Significant Figures

Rules for determining which digits in a number are significant.

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24

Precision

Refers to the closeness of measurements in a series to each other.

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25

Accuracy

How close each measurement is to the actual value.

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26

Systematic Error

An error that produces values that are all higher or all lower than the actual value.

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27

Random Error

An error that produces values that are both higher and lower than the actual value.

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28

Conversion Factors

Ratios of equivalent quantities used to express a quantity.

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29

Dimensional Analysis

The use of conversion factors as full ratios.

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30

Density

The ratio of mass to volume (density = mass/volume).

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31

Extensive Properties

Properties that depend on the amount of substance.

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32

Intensive Properties

Properties that are independent of the amount of substance.

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