unit 1 - matter, properties and changes

Question 1

what is matter?

Answer 1

anything that takes up space and has mass

Question 2

particle theory of matter 1. all matter is made up of ____ that have empty spaces between them

Answer 2

atoms

Question 3

particle theory of matter 2. all particles of one substance are _______

Answer 3

the same

Question 4

particle theory of matter 3. the ________ between particles are extremely large compared to the sizes of the particles

Answer 4

distance/space

Question 5

what is the only compound that doesn’t get closer when it gets colder?

Answer 5

water

Question 6

particle theory of matter 4. particles are always ______. the more ______, the faster they move

Answer 6

moving, energy

Question 7

particle theory of matter 5. there are ________ between particles

Answer 7

attractive forces

Question 8

what has the most attractive forces, what has the least?

Answer 8

most: solids, least: gases

Question 9

describe the space and motion of atoms in a solid

Answer 9

spaces between atoms are small, atoms vibrate

Question 10

describe the space and motion of atoms in a liquid

Answer 10

spaces between atoms are medium, atoms move slowly

Question 11

describe the space and motion of atoms in a gas

Answer 11

spaces between atoms are large, atoms move quickly

Question 12

a mixture ____ a chemical combining of substances

Answer 12

is not

Question 13

what do you call atoms that are bonded together?

Answer 13

molecules

Question 14

in a compound the atoms are _____ combined so that the elements that make up the compound ___ their identities and ___

Answer 14

chemically, lose, take on a new set of properties

Question 15

True or false? a mixture is always made up of a combination of elements

Answer 15

false

Question 16

in a mixture the substances ___ their identities

Answer 16

retain

Question 17

in a compound elements involved ____ be separated by a simple physical process because elements are ______

Answer 17

cannot, chemically bonded

Question 18

True or false? An element can be broken down into a simpler substance

Answer 18

false

Question 19

P or M? Air

Answer 19

mixture

Question 20

pure substance or mixture? Gasoline

Answer 20

mixture

Question 21

Pure substance or mixture? Water

Answer 21

pure substance

Question 22

Pure substance or mixture? sugar

Answer 22

pure substance

Question 23

Pure substance or mixture? gold

Answer 23

pure substance

Question 24

Pure substance or mixture? mercury

Answer 24

pure substance

Question 25

Pure substance or mixture? salt water

Answer 25

mixture

Question 26

what is a heterogeneous mixture?

Answer 26

a mixture in which the composition is not uniform throughout the mixture

Question 27

what is a homogeneous mixture

Answer 27

a mixture in which the composition is uniform throughout the mixture

Question 28

what are qualitative observations

Answer 28

observations made by using our five senses

Question 29

what are quantitative observations?

Answer 29

observations made based on numerical and statistical attributes

Question 30

how do you find density?

Answer 30

m/v

Question 31

how do you find mass

Answer 31

dv

Question 32

how do you find volume

Answer 32

m/d

Question 33

Physical changes occur when the _____ of a substance changes but there is _____ in the physical properties

Answer 33

appearance, no change

Question 34

during a physical change do the individual molecules change?

Answer 34

no

Question 35

A physical change occurs when substances are _____ and something______

Answer 35

mixed, dissolved

Question 36

physical changes _____ be separated again easily

Answer 36

can

Question 37

Chemical changes ____ be separated again easily

Answer 37

cannot

Question 38

A chemical change occurs when the particles making up matter ______ to form a new substance with______

Answer 38

rearrange, new properties

Question 39

when do chemical changes occur?

Answer 39

during a chemical reaction

Question 40

True or false? Rust is an example of a chemical change

Answer 40

true

Question 41

observations for production of a gas (evidence of chemical change)

Answer 41

bubbles, foaming, odor, fizzing, smoke

Question 42

observations for formation of a precipitate (evidence of chemical change)

Answer 42

cloudiness, foggy, solid at the bottom of the container

Question 43

observations for change in heat or light energy (evidence of chemical change)

Answer 43

temperature increases or decreases, Sparks, explosion, glowing

Question 44

what are all the pieces of evidence for a chemical change

Answer 44

production of a gas, colour change, formation of a precipitate, change in heat or light energy