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Flashcards in Chapter 1 Deck (46)
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1

microscopic particles that represent the smallest unit of matter with the properties of an element

atoms

2

fundamental building blocks of ordinary matter

atoms

3

free ______ are rare in nature

atoms

4

are combinations of atoms bound together in specific geometric arrangements

molecules

5

carbon monoxide is made up of

1 carbon and 1 oxygen

6

hydrogen peroxide is made up of

2 oxygen and 2 hydrogen

7

the properties of the substances around us depend on the ____ and _____ that compose them

atoms and molecules

8

scientific knowledge is ______

empirical

9

based on observation and experiments

empirical

10

a tentative interpretation or explanation of observations

hypothesis

11

should be falsifiable

hypothesis

12

highly controlled procedures designed to generate observations that can confirm or refute a hypothesis

experiments

13

a brief statement that summarizes past observations and predict future ones

scientific law

14

the law of conservation of mass states: in a chemical reaction, matter is neither

created nor destroyed

15

a model for the way nature is that attempts to explain not remedy what nature does, but why.

scientific theory

16

dalton's atomic theory proposed that matter is composed of

small, indestructible atoms that rearrange during chemical changes such that the total amount of mass remains constant.

17

theories can be supported by ________, but they can never _____

experimental data but they can never be conclusively proven

18

anything that occupies space and has mass

matter

19

if matter has a variable composition it is

a mixture

20

if matter does not have a variable composition it is

a pure substance

21

if a pure substance can separate into simpler substances it is a

compound

22

if a pure substance cannot separate into simpler substances it is an

element

23

if a mixture is uniform throughout its is

homogenous

24

if a mixture is not uniform throughout it is

heterogenous

25

example of an element

helium

26

example of a compound

pure water

27

example of a heterogeneous mixtrue

wet sand

28

example of a homogenous mixture

tea with sugar

29

are those composed of only a single type of atom or molecule

pure substances

30

are composed of two or more different types of atoms or molecules that can be combined in variable proportions

mixtures