Science- Changes in Matter Ch2

Question 1

physical change

Answer 1

change where matter keeps the same chemical properties

Question 2

chemical change

Answer 2

a change where one kind of matter changes into a different kind of matter with different properties

Question 3

evaporation

Answer 3

takes place when particles leave a liquid to become a gas

Question 4

condensation

Answer 4

occurs when a gas turns into a liquid

Question 5

sublimation

Answer 5

process where some solids change directly to gases without first becoming liquids (think dry ice)

Question 6

reactant

Answer 6

a substance used in a reaction in a chemical change

Question 7

product

Answer 7

a substance produced in a reaction in a chemical change

Question 8

chemical equation

Answer 8

shows what happens during a chemical reaction

Question 9

physical

Answer 9

freezing rain (physical or chemical change)

Question 10

physical

Answer 10

sawing wood (physical or chemical change)

Question 11

physical

Answer 11

shredding paper (physical or chemical change)

Question 12

physical

Answer 12

melting wax (physical or chemical change)

Question 13

physical

Answer 13

grating a potato (physical or chemical change)

Question 14

physical

Answer 14

hammer copper into sheets (physical or chemical change)

Question 15

physical

Answer 15

salt crystals dissolved in water (physical or chemical change)

Question 16

chemical

Answer 16

often produces a gas or a solid (physical or chemical change)

Question 17

chemical

Answer 17

burning (physical or chemical change)

Question 18

chemical

Answer 18

copper crystals in tree experiment (physical or chemical change)

Question 19

chemical

Answer 19

burning wax (physical or chemical change)

Question 20

solid, liquid, gas

Answer 20

3 states of matter

Question 21

solid

Answer 21

have their own shape and volume that does not change (Pick one of the 3 states of matter)

Question 22

physical property

Answer 22

state of a material as a solid, liquid, or gas at room temperature (physical or chemical property)

Question 23

solid

Answer 23

melts into a liquid as it warms up (Pick one of the 3 states of matter)

Question 24

liquid

Answer 24

does not have its own shape and volume does not change (Pick one of the 3 states of matter)

Question 25

gas

Answer 25

state where particles are far apart (Pick one of the 3 states of matter)

Question 26

liquid, solid

Answer 26

state where particles are close together (Pick two of the 3 states of matter)

Question 27

gas

Answer 27

does not have its own shape and volume changes (Pick one of the 3 states of matter)

Question 28

freezing point, melting point

Answer 28

temperature at which a material changes between solid and liquid states

Question 29

moving

Answer 29

warmer particles are always...

Question 30

expand

Answer 30

warm particles tend to (shrink or expand)

Question 31

shrink

Answer 31

cooling materials tend to (shrink or expand)

Question 32

Law of Conservation of Mass

Answer 32

matter cannot be created or destroyed during a chemical reaction

Question 33

decomposition reaction

Answer 33

type of reaction where compounds split apart to form smaller compounds or elements

Question 34

combination reaction

Answer 34

type of reaction where elements or compounds come together to form new compounds

Question 35

replacement reaction

Answer 35

type of reaction where two or more compounds split apart

Question 36

chemical

Answer 36

chemicalrust forming on a chain (physical or chemical)

Question 37

decomposition

Answer 37

hydrogen peroxide reaction (decomposition, combination, replacement)

Question 38

combination

Answer 38

rust forming on a chain (decomposition, combination, replacement)

Question 39

replacement

Answer 39

two colorless liquids mixed and new substance formed is a yellow substance in water (decomposition, combination, replacement)

Question 40

chemical

Answer 40

_____ properties can be used to separate some mixtures. (Choose chemical or gas)

Question 41

solution

Answer 41

A ____ is a uniform mixture of two substances.

Question 42

true

Answer 42

Heat and carbon can be used to release iron from ore (true or false)

Question 43

true

Answer 43

Chemical properties can be used to remove lead from a solution of lead and other materials. (true or false)

Question 44

false

Answer 44

weak acids and bases react more easily with materials than do strong acids and bases. (true or false)

Question 45

true

Answer 45

lemon juice and vinegar are acids. (true or false)

Question 46

true

Answer 46

in flame tests, different substances cause a flame to have different colors. (true or false)

Question 47

false - (base turns purple, acid turns red, orange)

Answer 47

Strong acids will turn universal indicator paper purple. (true or false)

Question 48

chemical equation --> replacement

Answer 48

2FeO + C --> 2Fe + CO2 (decomposition, combination or replacement)

Question 49

gas

Answer 49

particles far apart (Pick 1, 2 or 3 of the 3 states of matter)

Question 50

liquid, solid

Answer 50

particles close together (Pick 1, 2 or 3 of the 3 states of matter)

Question 51

gas, liquid

Answer 51

no distinct shape (Pick 1, 2 or 3 of the 3 states of matter)