unit 1 i think??

Question 1

matter

Answer 1

has mass and volume

Question 2

properties of solids

Answer 2

definite shape and volume. molecules rigid in repeating geometric pattern and vibrate

Question 3

properties of liquids

Answer 3

definite volume, not shape. molecules undulate (slide past each other)

Question 4

properties of gases

Answer 4

no definite shape or volume. spread out evenly in container and can be compressed

Question 5

diatomic atoms

Answer 5

B R I Cl H O F elements that must exist in pairs in nature and are technically molecules

Question 6

compound

Answer 6

pure substance made of 2 or more different elements created through chemical reactions

Question 7

molecule

Answer 7

chemical combination of 2 or more atoms with covalent bonds only made through chemical reactions

Question 8

pure substance

Answer 8

a substance with only one type of molecule/particle in it, but can be only one type of compound

Question 9

mixture

Answer 9

a blend of 2 or more pure substances NOT by chemical means. has no formula or set ratio

Question 10

alloy

Answer 10

mix of different types of metals

Question 11

homogenous vs heterogenous mixtures

Answer 11

homogenous has all components spread evenly throughout and heterogenous there are clear spots where things are

Question 12

extensive vs intensive properties

Answer 12

extensive properties have to do with how much of something there is where as intensive deals with characteristics of a thing no matter the size

Question 13

physical vs chemical properties

Answer 13

physical doesnt deal with the composition of a substance, chemical does. aqueous solutions are HOMOGENEOUS MIXTURES

Question 14

physical properties examples

Answer 14

bp, mp, color, density, odor, texture, mass, volume, etc

Question 15

chemical properties examples

Answer 15

flammability, oxidation, reaction with water, etc

Question 16

physical changes vs chemical changes

Answer 16

physical changes change appearances, chemical changes change identities

Question 17

examples of physical changes

Answer 17

melt, break, split, shave, crush, rip, crack, phase changes, dissolving, etc

Question 18

signs of a chemical change

Answer 18

creation of a precipitate, temperature change, light emission, color change, evolution of gas

Question 19

uncommon signs of a chemical change

Answer 19

change in electrical conductivity, change in mp/bp, change in smell or taste, change in volume.

Question 20

laws of conservation of mass

Answer 20

mass/matter is neither created nor destroyed. mass of reactants = mass of products

Question 21

law of definite proportion/law of constant composition

Answer 21

all samples of a chemical composition have the same makeup and proportions

Question 22

techniques to separate a mixture

Answer 22

magnetism, floatation, hand separation, filtration, evaporation, distillation, chromatography

Question 23

magnetism

Answer 23

separates metals and nonmetals

Question 24

floatation

Answer 24

for things with diff densities

Question 25

filtration

Answer 25

separates things by particle size

Question 26

hand separation

Answer 26

obvious

Question 27

evaporation

Answer 27

separates by boiling point, usually for aqueous solutions

Question 28

distillation

Answer 28

separates by boiling point, usually for two liquid mixture

Question 29

chromatography

Answer 29

separates by attraction to solvent

Question 30

percent comp equation

Answer 30

part/whole x100 = percent comp%

Question 31

rate equation

Answer 31

change/time, or deltaT = T final - T initial