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Flashcards in Chapter 1 lecture Deck (29):
1

matter

anything that has mass and occupies space

2

mass

refers to the amount of matter present in a sample
- includes both living and nonliving that can be seen

3

what is not considered to be matter?

various forms of energy such as heat light and elctricity

4

solid

physical state characterized by a definite shape and definite volume

5

liquid

the physical state characterized by an indefinite shape and a definite volume

6

gas

physical state characterized by an indefinite shape and an indefinite volume

7

physical property

characteristic of a substance that can be observed without changing the basic identity of the substance
(color; odor, physical state (solid, liquid, or gas) melting point; boiling and poing and hardness)

8

properties

are the distinguishing characteristics of a substance that are used in its identification and description

9

chemical property

a characteristic of a substance that describes the way the substance undergoes or resists change to form a new substance

10

physical change

a process in which a substance changes its physical appearance but not its chemical composition
- new substance is never formed as a result of a physical change

11

chemical change

a process in which a substance undergoes a change in chemical composition
- always involve conversion of material(s) under consideration into one or more new substances

12

pure substance

single kind of matter that cannot be separated into other kinds of matter by any physical means
- contains only that substance and nothing else

13

mixture

physical combination of two or more pure substances in which each substance retains its own chemical identity
- retain because they are physically mixed rather than chemically combined

14

mixtures are subclassified to?

heterogenous or homogenous

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heterogenous mixture

contains visibly different phases (parts), each of which has different properties
- non uniform appearance is a charateristic of all heterogenous mixtures

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homogenous mixture

contains only one visibly distinct phase (part), which has uniform properties throughout
- components cannot be visually distinguished

17

element

pure substance that cannot be broken down into simpler pure substances by ordinary chemical means such as a reaction, an electric current, heat or a beam of light.

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compound

pure substance that can be broken down into two or more simpler pure substances by chemical means
- water

19

chemical symbol

one ore two letter designation for an element derived from the name of the element
- firest letter is always capitalized and second is not

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atom

the smallest particle of an element that can exist and still have the properties of the element

21

molecule

group of two or more atoms that functions as a unit because the atoms are tightly bound together

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diatomic molecule

molecule that contains two atoms

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triatomic molecule

molecule that contains three atoms

24

molecules are classified into two categories:

homoatomic and heteroatomic

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homoatomic molecule

molecule in which all atoms present are the same kind

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heteroatomic molecule

molecule in which two or more kinds of atoms are present

27

chemical formula

notation made up of the symbols of the elements present in a compound and numerical subscripts (located to the right of each symbol) that indicate the number of atoms of each element present in a molecule of the compound

28

chemistry


-Chemistry is the study of the composition, properties and interactions of matters.

29

submicroscopic particles

matters are made of extremely small particles that cannot be seen even with the most powerful microscope