Chemistry

Front 1

What is matter

Back 1

anything that has mass and takes up space

Front 2

What is mass

Back 2

the mass of an object is the amount of matter the object contains

Front 3

what is substance

Back 3

matter that has a uniform and definite composition

Front 4

what is a physical property

Back 4

a quality or condition of a substance that can be observedor measured without changing the substance's compostion

Front 5

solid

Back 5

matter that has definate shape and volume

Front 6

liquid

Back 6

a form of matter that flows, has a fixed volume, and takes the shape of its container

Front 7

gas

Back 7

a form of matter taht takes both the shape and volume of its container

Front 8

vapor

Back 8

the gaseous state of a substance that is generally a liquid or solid at room temp

Front 9

physical change

Back 9

a change which alters a given material without changing its composition

Front 10

mixture

Back 10

a physical blend of two or more substances

Front 11

heterogeneous mixture

Back 11

one that is not uniform in composition

Front 12

homogeneous mixture

Back 12

one that has a completely uniform compostions, its components are evenly distributed throught the sample

Front 13

solutions

Back 13

homogeneous mixtures

Front 14

phase

Back 14

any part of a system with uniform compostion and properties

Front 15

distillation

Back 15

a liquid is boiled to produce a vapor that is then condensed again to a liquid

Front 16

elements

Back 16

the simplest forms of matter that can exist under normal laboratory conditions, cannot be seperated into simpler substances by chemical means, they are building blocks for all other substances

Front 17

compounds

Back 17

substances that can be separated into simpler substances only by chemical means

Front 18

chemical symbol

Back 18

symbol each element is represented by

Front 19

chemical reaction

Back 19

one or more substances change into new substances

Front 20

reactants

Back 20

the starting substances in a chemical reaction

Front 21

products

Back 21

the substances formed in a chemical reaction

Front 22

chemical property

Back 22

the ability of a substance to undergo a chemical reaction and go to form new substances

Front 23

law of conservation of mass

Back 23

ina ny physical change or chemical re3action, mass is neither created or destroyed; it is conserved

Front 24

quantitative measurements

Back 24

givesresults ina definite form, usually as numvers and units

Front 25

accuracy

Back 25

a measure of how close a measurement comes to the actual or true value of whatever si measured

Front 26

precision

Back 26

measure of how close a series of measurements are to one another

Front 27

density

Back 27

ratio of the mass of an object to its volume

Front 28

dalton's atomic theory

Back 28

1. all elements are composed of tiny indivisible particles called atoms
2. atoms of the same element are identical. the atoms of any one element are different from those of any other element
3. atoms of different elements can physically mix together or can chemically combine with one another in simple whole-number ratios to form compounds
4. chemical reactions occur when atoms are separated, joined, or rearranged. atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction

Front 29

atom

Back 29

the smallest particle of an element that retains the properties of that element

Front 30

cathode ray

Back 30

a stream of electorns produced at the negative electrode of a tube containing a gas at low pressure