chemistry 2.0

Question 1

anything that has mass and occupies space

Answer 1

matter

Question 2

the smallest stable building block of matter

Answer 2

atom

Question 3

groups of atoms held together with a specific connectivity and shape

Answer 3

molecule

Question 4

the types of atoms that are present in a compound and the ratio of these atoms

Answer 4

composition

Question 5

H2O

Answer 5

water

Question 6

C2H60

Answer 6

ethanol

Question 7

how atoms are connected to each other

Answer 7

structure

Question 8

methods of classification of matter

Answer 8

state of matter, composition of matter

Question 9

physical state is gas, liquid or solid

Answer 9

state of matter

Question 10

element, compound or mixture

Answer 10

composition of matter

Question 11

state of matter

Answer 11

gas, liquid, solid

Question 12

composition of matter

Answer 12

element, compound, mixture

Question 13

has both definite shape and definite volume, not significantly compressible, diffusion occurs extremely slowly

Answer 13

solid

Question 14

distinct volume, independent of its container not significantly compressible. diffusion occurs but slower than gas

Answer 14

liquid

Question 15

no fixed volume or shape, expands to fill its container, flows readily, diffusion occurs rapidly

Answer 15

gas(vapor)

Question 16

can be measured without changing the identity and composition of the substance. ex?

Answer 16

physical properties. melting/boiling point, color, hardness

Question 17

describe the way a substance may change or react to form other substances. ex?

Answer 17

chemical properties. flammability

Question 18

changes?

Answer 18

physical vs chemical

Question 19

a substance changes its physical appearance but not its composition. ex?

Answer 19

physical change. evaporation of water

Question 20

also known as chemical reactions; a substance is transformed into a chemically deifferent substance. ex?

Answer 20

chemical change. burning

Question 21

properties

Answer 21

intensive properties and extensive properties

Question 22

not depend on the amount of the sample being examined. ex?

Answer 22

intensive properties. temperature, pressure

Question 23

depend on the quantity of the sample and include measurements of the mass and volume

Answer 23

extensive properties. mass length and volume

Question 24

ways of classifying matter

Answer 24

pure substances, mixtures

Question 25

also known as substance. matter that has a fixed composition. all substances are either elements or compounds. ex?

Answer 25

pure substances. sodium chloride (salt)

Question 26

combinations of two or more substances. ex?

Answer 26

mixtures. sweetened coffee

Question 27

substances that cannot be decomposed into simpler substances

Answer 27

elements

Question 28

total of elements in the periodic table

Answer 28

118

Question 29

composed of two or more elements

Answer 29

compounds

Question 30

ethanol

Answer 30

C2H6O

Question 31

quartz

Answer 31

SiO2

Question 32

chloride

Answer 32

NaCl

Question 33

mixtures and compounds

Answer 33

homogenous and heterogenous mixtures

Question 34

uniform throughout, also known as solutions. ex?

Answer 34

homogenous mixture. air, gasoline, brass

Question 35

do not have the same composition properties and appearance throughout the mixture. ex?

Answer 35

heterogenous mixture. sand, rocks, and wood