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Flashcards in chem chapter 2 test Deck (54):
0

a material's ability to be stretched into a wire

ductility

1

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

intensive property

2

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

extensive property

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.

conductivity

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.

malleability

5

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

pure substances

6

the ability of a substance to undergo a specific chemical change

chemical property

7

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

physical property

8

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

mixtures

9

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

homogeneous

10

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

heterogeneous

11

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

element

12

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

compound

13

the release of heat

exothermic

14

the absorption of heat

endothermic

15

does the composition of a pure substance vary?

no

16

what is elasticity

the ability to stretch and return to its original size

17

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

Chemical, Physical, Chemical

18

are the following physical or chemical properties
flammable, dissolves in water, produces a different gas when heated, melting point

CP, PP, CP, PP

19

Physical or Chemical Change?
a tire is inflated with air, water freezes, pancakes cook on a griddle, grass grows on a lawn

PC, PC, CC, PC

20

a physical property is determined with destroying ___________.

matter

21

Chemical or Physical Change?
Silver tarnishes, Heat changes H20 to steam, Milk sours, wood rots, food is digested

CC, PC, CC, CC, CC

22

chemical or physical property
sour taste, boiling point, luster, odor

PP, PP, PP, PP

23

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

chemical change

24

when ice cream melts, does a chemical change occur?

NO

25

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

E, O, O, O, E, O

26

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

C, M, C, M, C, M

27

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

P, P, C, C, P

28

physical or chemical change
making hydrogen from water

chemical

29

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

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

30

what is ammonia

compound

31

al alloys are ___________ _____________.

homogeneous mixtures

32

solid waste dump is a ______ ________.

heterogeneous mixtures

33

Group ______ are highly reactive in water

1A

34

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

physical (still nitrogen)

35

the smallest unit of a pure substance is an ___

atom

36

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

composition (then, appearance)

37

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

I, I, E, I

38

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

tarnish, or oxidation (loss of electrons)

39

what does LEO says GER mean

lost electrons oxidation, gained electrons reduction

40

the production of light by a glowworm is a ______ change

chemical

41

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

pure substance (uniform composition-new properties)

42

molecules are _____ atoms that must be _______

bonded, different

43

homogeneous mixtures are also

solutions

44

what are ways to separate mixtures

evaporation, filtration, magnetism, distillation

45

is blood hetero or homogeneous

hetero

46

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

mixture (composition vary, properties retained)

47

what is redox

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

48

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

zinc, oxidized
copper, reduced
zinc zincate

49

what is a property

characteristic of a certain thing

50

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

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

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)

latin, first, third

52

change in which the identity of the substance does not change

physical change

53

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

chemical change