chem chapter 2 test

Question 0

a property that depends on the type of matter in a sample, not the amount of matter

Answer 0

intensive property

Question 1

a material’s ability to be stretched into a wire

Answer 1

ductility

Question 2

a property that depends on the amount of matter in a sample

Answer 2

extensive property

Question 3

the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current. It is the reciprocal of the resistivity.

Answer 3

conductivity

Question 4

physical property of matter, usually metals. It usually applies to the family groups 1 to 12 on the modern periodic table of elements. It is the ability of a solid to bend or be hammered into other shapes without breaking.

Answer 4

malleability

Question 5

they have fixed compositions, one set of intrinsic properties (density, melting point, boiling point) and can be separated only by chemical means

Answer 5

pure substances

Question 6

the ability of a substance to undergo a specific chemical change

Answer 6

chemical property

Question 7

a quality or condition of a substance that can be observed or measured without changing the substance’s composition

Answer 7

physical property

Question 8

these have variable composition. their physical properties vary depending on the composition. They can be separated by physical means

Answer 8

mixtures

Question 9

exists in one phase only and has uniform properties throughout the sample

Answer 9

homogeneous

Question 10

may exist in more than one phase and have variable properties in different parts of the sample

Answer 10

heterogeneous

Question 11

these cannot be broken down into simpler substances by physical or chemical means. The smallest particle of this is called an atom

Answer 11

element

Question 12

these are made of elements in fixed mass ratios. They can be broken down into simpler substances by chemical means

Answer 12

compound

Question 13

the release of heat

Answer 13

exothermic

Question 14

the absorption of heat

Answer 14

endothermic

Question 15

does the composition of a pure substance vary?

Answer 15

no

Question 16

what is elasticity

Answer 16

the ability to stretch and return to its original size

Question 17

are the following physical or chemical?
frying an egg
mixing salt and water
fireworks exploding

Answer 17

Chemical, Physical, Chemical

Question 18

are the following physical or chemical properties

flammable, dissolves in water, produces a different gas when heated, melting point

Answer 18

CP, PP, CP, PP

Question 19

Physical or Chemical Change?

a tire is inflated with air, water freezes, pancakes cook on a griddle, grass grows on a lawn

Answer 19

PC, PC, CC, PC

Question 20

a physical property is determined with destroying ___________.

Answer 20

matter

Question 21

Chemical or Physical Change?

Silver tarnishes, Heat changes H20 to steam, Milk sours, wood rots, food is digested

Answer 21

CC, PC, CC, CC, CC

Question 22

chemical or physical property

sour taste, boiling point, luster, odor

Answer 22

PP, PP, PP, PP

Question 23

two substances are mixed together and light is produced is a ___

Answer 23

chemical change

Question 24

when ice cream melts, does a chemical change occur?

Answer 24

NO

Question 25

heterogeneous or homogeneous? | wood, freshly-brewed black coffee, salt, water, dirt, milk

Answer 25

E, O, O, O, E, O

Question 26

element, compound, or mixture? | water, seawater, sugar, air, ice, big mac

Answer 26

C, M, C, M, C, M

Question 27

physical or chemical property | conductor of heat, density, flammable, not affected by acids, malleable

Answer 27

P, P, C, C, P

Question 28

physical or chemical change | making hydrogen from water

Answer 28

chemical

Question 29

intensive or extensive property? | mass, density, melting point, color, volume, length, temperature

Answer 29

E, I, I, I, E, E, E

Question 30

what is ammonia

Answer 30

compound

Question 31

al alloys are ___________ _____________.

Answer 31

homogeneous mixtures

Question 32

solid waste dump is a ______ ________.

Answer 32

heterogeneous mixtures

Question 33

Group ______ are highly reactive in water

Answer 33

1A

Question 34

liquid nitrogen exposed to air becomes nitrogen gas is a ______ change

Answer 34

physical (still nitrogen)

Question 35

the smallest unit of a pure substance is an ___

Answer 35

atom

Question 36

which word best describes the difference between a homogeneous and a heterogeneous mixture

Answer 36

composition (then, appearance)

Question 37

Intensive or Extensive? | flammability, not affected by acids, temperature, tendency to rust

Answer 37

I, I, E, I

Question 38

The copper sheath on the statue of liberty turns green is a chemical change, but more specifically is

Answer 38

tarnish, or oxidation (loss of electrons)

Question 39

what does LEO says GER mean

Answer 39

lost electrons oxidation, gained electrons reduction

Question 40

the production of light by a glowworm is a ______ change

Answer 40

chemical

Question 41

A+B------->C is indicating a _________

Answer 41

pure substance (uniform composition-new properties)

Question 42

molecules are _____ atoms that must be _______

Answer 42

bonded, different

Question 43

homogeneous mixtures are also

Answer 43

solutions

Question 44

what are ways to separate mixtures

Answer 44

evaporation, filtration, magnetism, distillation

Question 45

is blood hetero or homogeneous

Answer 45

hetero

Question 46

A+B------->AB indicates a _______

Answer 46

mixture (composition vary, properties retained)

Question 47

what is redox

Answer 47

oxidation and reduction | happens when electrons are lost (oxidation) and gained (reduction)

Question 48

in the Penny Lab, what was being oxidized and reduced, what was created

Answer 48

zinc, oxidized copper, reduced zinc zincate

Question 49

what is a property

Answer 49

characteristic of a certain thing

Question 50

element rules : single letter symbols are derived from _____ name three letter symbols means the element is ______ sometimes derived from _____/______ of discovery, or _______ name

Answer 50

english, man made, city/state, scientist's

Question 51

some elements are derived from the ____ name like sodium | if two elements have same first two letters, often symbols are ____ and ____ letters (like Magnesium and Manganese)

Answer 51

latin, first, third

Question 52

change in which the identity of the substance does not change

Answer 52

physical change

Question 53

a change that produces matter with a different composition than the original matter

Answer 53

chemical change