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1

qualitative

does not involve a number

2

quantitative

involves a number or some sort of unit

3

theory (model)

a set of tested hypothesis

4

observation

witnessed and recorded

5

natural law

statement that expresses general observed

6

law of conservation of mass

the total mass of materials is not affected by a chemical change

7

law

summary of observed (measurable) behaviour

8

scientific method

make observations, formulate hypothesis, perform experiments

9

theory

explanation to why nature behaves in a particular way

10

scientific notation

make larger or smaller numbers compact and easier to write

11

SI units

system of units called International System

12

conversion factor

ratio of the two parts of a statement that relates the two units

13

density

the amount of matter present in a given volume of a substance

14

volume

amount of 3d space occupied by an object

15

mass

quantity of matter present in an object

16

equivalence statement

different units that stand for the same thing

17

dimensional analysis

changing from one unit to another by conversion factors

18

fahrenheit scale

freezes at 32 degrees F and boils at 212 degrees F

19

celsius scale

freezes at 0 C and boils at 100 C

20

kelvin (absolute) scale

freezes at 273K and boils at 373K

21

specific gravity

the ratio of the density of a liquid, to the density of the water at 4 C

22

element symbols

abbreviations for the elements

23

law of constant composition

compounds will always contain elements in same mass proportions

24

dalton's atomic theory

early 1800s, explain nature of materials

25

atom

fundamental unit of atoms

26

compound

a substance that can be broken down into elements

27

chemical formula

representation of a molecule, symbols represent elements, subscripts show the number of atoms

28

electron

negatively charged particle

29

nuclear atom

modern concept of atom, nucleus positive charge, orbiting electrons

30

nucleus

small dense center of positive charge in an ion