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Junior Year > chem chapter 2 test > Flashcards

chem chapter 2 test Flashcards

0
Q

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

A

intensive property

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1
Q

a material’s ability to be stretched into a wire

A

ductility

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2
Q

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

A

extensive property

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3
Q

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.

A

conductivity

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4
Q

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.

A

malleability

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5
Q

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

A

pure substances

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6
Q

the ability of a substance to undergo a specific chemical change

A

chemical property

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7
Q

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

A

physical property

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8
Q

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

A

mixtures

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9
Q

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

A

homogeneous

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10
Q

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

A

heterogeneous

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11
Q

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

A

element

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12
Q

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

A

compound

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13
Q

the release of heat

A

exothermic

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14
Q

the absorption of heat

A

endothermic

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15
Q

does the composition of a pure substance vary?

A

no

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16
Q

what is elasticity

A

the ability to stretch and return to its original size

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17
Q

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

A

Chemical, Physical, Chemical

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18
Q

are the following physical or chemical properties

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

A

CP, PP, CP, PP

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19
Q

Physical or Chemical Change?

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

A

PC, PC, CC, PC

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20
Q

a physical property is determined with destroying ___________.

A

matter

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21
Q

Chemical or Physical Change?

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

A

CC, PC, CC, CC, CC

22
Q

chemical or physical property

sour taste, boiling point, luster, odor

A

PP, PP, PP, PP

23
Q

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

A

chemical change

24
Q

when ice cream melts, does a chemical change occur?

A

NO

25
Q

heterogeneous or homogeneous?

wood, freshly-brewed black coffee, salt, water, dirt, milk

A

E, O, O, O, E, O

26
Q

element, compound, or mixture?

water, seawater, sugar, air, ice, big mac

A

C, M, C, M, C, M

27
Q

physical or chemical property

conductor of heat, density, flammable, not affected by acids, malleable

A

P, P, C, C, P

28
Q

physical or chemical change

making hydrogen from water

A

chemical

29
Q

intensive or extensive property?

mass, density, melting point, color, volume, length, temperature

A

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

30
Q

what is ammonia

A

compound

31
Q

al alloys are ___________ _____________.

A

homogeneous mixtures

32
Q

solid waste dump is a ______ ________.

A

heterogeneous mixtures

33
Q

Group ______ are highly reactive in water

A

1A

34
Q

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

A

physical (still nitrogen)

35
Q

the smallest unit of a pure substance is an ___

A

atom

36
Q

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

A

composition (then, appearance)

37
Q

Intensive or Extensive?

flammability, not affected by acids, temperature, tendency to rust

A

I, I, E, I

38
Q

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

A

tarnish, or oxidation (loss of electrons)

39
Q

what does LEO says GER mean

A

lost electrons oxidation, gained electrons reduction

40
Q

the production of light by a glowworm is a ______ change

A

chemical

41
Q

A+B——->C is indicating a _________

A

pure substance (uniform composition-new properties)

42
Q

molecules are _____ atoms that must be _______

A

bonded, different

43
Q

homogeneous mixtures are also

A

solutions

44
Q

what are ways to separate mixtures

A

evaporation, filtration, magnetism, distillation

45
Q

is blood hetero or homogeneous

A

hetero

46
Q

A+B——->AB indicates a _______

A

mixture (composition vary, properties retained)

47
Q

what is redox

A

oxidation and reduction

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

48
Q

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

A

zinc, oxidized
copper, reduced
zinc zincate

49
Q

what is a property

A

characteristic of a certain thing

50
Q

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

A

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

51
Q

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)

A

latin, first, third

52
Q

change in which the identity of the substance does not change

A

physical change

53
Q

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

A

chemical change

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