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Chemistry: Ch.3 Elements and Compounds > Elements and Compounds - Chem (ch.03) > Flashcards

Elements and Compounds - Chem (ch.03) Flashcards

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1
Q

Matter

A

anything that has mass and occupies space

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2
Q

Atom

A

smallest unit of matter than can be divided

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3
Q

Element

A

a pure substance made up of only one kind of atom and it cannot be broken down by chemical means

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3
Q

Molecule

A

group of 2 or more atoms that are chemically bonded together

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4
Q

Orbits

A

the fixed paths that the electrons of a nucleus move around

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5
Q

example of liquid non-metal

A

bromine

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6
Q

total no. of elements

A

118 (94 are natural)

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7
Q

Examples of metals

A

gold, iron, silver, copper, zinc etc

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8
Q

Metalloids

A

elements that exhibit intermediate properties between those of metals and non-metals

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9
Q

Noble/Inert Gases

A

elements that are highly stable and do not react chemically with other elements

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10
Q

Compounds

A

pure substances made up of atoms of two or more different elements chemically combined in fixed ratios

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11
Q

chemical formula

A

expression which states the number and type of atoms present in 1 molecule of a compound

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12
Q

chemical formula of sulphate of soda

A

(sodium sulphate) Na2SO4

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13
Q

chemical formula of vinegar

A

CH3COOH

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14
Q

chemical formula of rust

A

Fe2O3 x H2O

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15
Q

chemical formula of plaster of paris

A

CaSO4 . 1/2H2O

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16
Q

Mixture

A

physical combination of two or more pure substances

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17
Q

types of mixtures

A

homogeneous and heterogeneous

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18
Q

Alloy

A

homogeneous combination of one metal with 1 or more metal(s) or non-metal(s)

19
Q

Substance present in larger amount in solutions

A

Solvent

19
Q

substance present in smaller amount in solution

A

Solute

20
Q

Emulsion

A

a mixture of two or more normally immiscible liquids

21
Q

Suspension

A

type of heterogeneous mixture in which small particles are suspended in a liquid

22
Q

Need for separation of substances

A

to remove harmful or undesirable impurities
to obtain a useful substance
to obtain the pure sample of a substance

23
Q

Sublimation

A

some substances, when heated, pass directly into the gaseous state from the solid state without entering the liquid state
(this is called sublimation)

24
Q

Reverse process of sublimation

A

Reverse sublimation
deposition
(either)

25
Q

Example of sublime solids

A

camphor, iodine, napthalene

26
Q

Evaporation

A

the process of evaporation involves heating the solution until the solvent evaporates

27
Q

Distillation

A

this process involves separation of a liquid from a solid- liquid mixture in which solid is soluble in liquid

28
Q

pure liquid obtained after distillation

A

distillate

29
Q

solid left in the flask after distillation

A

residue

30
Q

misicibility

A

ability of a liquid to dissolve in another liquid

31
Q

method of separating miscible liquids

A

simple distillation

32
Q

method of separating immiscible liquids

A

seperating funnel

33
Q

first person to use chromatography

A

Mikhail Tsvet

34
Q

red pigment found in leaves

A

anthocyanin

35
Q

blue-green pigment found in leaves

A

chlorophyll a

36
Q

yellow pigment found in leaves

A

xanthophyll

37
Q

orange pigment found in leaves

A

carotene

38
Q

yellow-green pigment found in leaves

A

chlorophyll b

39
Q

used of chromatography

A

forensic testing
Dope testing of athletes
Food Testing
Medicine

40
Q

how many neutrons does deuterium have?

A

1

41
Q

how many neutrons does protium have?

A

0

42
Q

how many neutrons does tritium have?

A

2

43
Q

What is RF?

A

Retention factor

44
Q

How do you calculate RF value?

A

RF = distance travelled by the component from the original line/distance travelled by the solvent from the original line(solvent front)

Chemistry: Ch.3 Elements and Compounds (1 decks)

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