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CHEMISTRY > ACIDS,BASES AND SALTS > Flashcards

ACIDS,BASES AND SALTS Flashcards

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1
Q

acids have

A

sour taste

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2
Q

bases have

A

bitter taste

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3
Q

acids change

A

blue litmus to red

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4
Q

bases change

A

red litmus to blue

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5
Q

natural indicators

A

litmus, turmeric

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6
Q

synthetic indicators

A

methyl orange, phenolphthalein

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7
Q

litmus is

A

the purple dye extracted from lichen

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8
Q

lichen belongs to

A

the division thallophyta

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9
Q

natural materials that indicate the presence of acids or bases

A

red cabbage leaves, turmeric, coloured petals of flowers such as hydrangea, petunia and geranium

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10
Q

substances whose odour changes in acidic or basic media

A

olfactory indicators

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11
Q

acid + metal

A

salt + hydrogen gas

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12
Q

Na2ZnO2

A

sodium zincate

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13
Q

different forms of calcium carbonate

A

limestone, chalk, and marble

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14
Q

all metal carbonates and hydrogen carbonates react with acids to give

A

a corresponding salt, carbon dioxide, and water

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15
Q

metal carbonate/ hydrogen carbonate + acid

A

salt + CO2 + H2O

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16
Q

The reaction between an acid and base is

A

known as neutralization reaction

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17
Q

base + acid

A

salt + water

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18
Q

metal oxide + acid

A

salt + water

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19
Q

the blue-green color of copper sulfate solution is due to

A

formation of copper chloride

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20
Q

metallic oxides are

A

basic in nature

21
Q

non-metallic oxides are

A

acidic in nature

22
Q

the bulb will glow

A

in the case of acids

23
Q

electric current is carried

A

through the acidic solution by ions

24
Q

cations present in acids

A

H+

25
Q

hydrogen ions in an acid

A

are produced in water

26
Q

bases generate

A

OH- ions in water

27
Q

bases soluble in water are

A

known as alkalis

28
Q

alkalis are

A

soapy to touch,

bitter and corrosive

29
Q

the acid must be always

A

added slowly to the water while constantly stirring it

30
Q

water can’t be added to a concentrated acid

A

because it is a highly exothermic reaction that may cause the mixture to splash and cause burns on the skin. clothes etc

31
Q

the glass container may also break

A

due to excessive local heating

32
Q

mixing an acid or base with water results in a decrease in the concentration of ions, per unit volume

A

this process is called dilution and the acid or base is said to be diluted

33
Q

the universal indicator

A

shows different colours at different concentrations of hydrogen ions in a solution

34
Q

pH scale

A

a scale for measuring hydrogen ion concentration in a solution

35
Q

the p in ph stands for

A

potenz in german meaning power

36
Q

Higher the hydronium concentration

A

lower is the pH value

37
Q

the pH of a neutral solution

A

7

38
Q

the pH of an acidic solution

A

less than 7

39
Q

pH value increasing from 7 to 14

A

alkali solution, increase in OH- ion concentration

40
Q

the pH of gastric juice

A

1.2

41
Q

the pH of lemon juice

A

2.2

42
Q

the pH of pure water and blood

A

7.4

43
Q

the pH of milk of magnesia

A

10

44
Q

the pH of sodium hydroxide solution

A

about 14

45
Q

strong acids

A

give out more H+ ions

46
Q

weak acids

A

give out fewer H+ ions

47
Q

our body works within the pH range of

A

7.0 to 7.8

48
Q

acid rain

A

when the pH of rain water is less than 5.6

CHEMISTRY (3 decks)

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