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chemistry > 3.1.3 - pure substance > Flashcards

3.1.3 - pure substance Flashcards

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1
Q

what do pure substances contain?

A

only ONE type of particles

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2
Q

pure substance melting+ boiling point?

A

have a single sharp melting and boiling point

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3
Q

what do mixtures contain?

A

different types of particle

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4
Q

mixtures melting + boiling point?

A

melt and boil over a range of temperatures

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5
Q

what is an element?

A

a substance containing only one kind of atom

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6
Q

what is a compound?

A

a substance containing different types of atoms which are chemically bonded together

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7
Q

chemical test for water?

A

anhydrous copper(II) sulphate
turns white -> blue

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8
Q

physical tests for water?

A

melting point = 0 degrees
boiling point = 100 degrees
pure water would melt/boil exactly on this temp

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9
Q

properties of metals:

A
  • high MP/BP
  • electrical conductors
  • malleable
  • shiny
  • form alkaline oxides
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10
Q

properties of non-metals:

A
  • low MP/BP
  • electrical insulators
  • brittle
  • dull
  • form acidic oxides
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11
Q

what is element combustion?

A

when an element reacts with oxygen to produce an oxide

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12
Q

element combustion equation?

A

element + oxygen -> element oxide

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13
Q

combustion of magnesium equation?

A

magnesium + oxygen -> magnesium oxide

2Mg + O2 -> 2MgO

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14
Q

observations of combustion of magnesium?

A

bright white light
white powder formed

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15
Q

combustion of sulphur equation?

A

sulphur + oxygen -> sulphur dioxide

S + O2 -> SO2

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16
Q

observations of combustion of sulphur?

A

blue flame

17
Q

combustion of hydrogen equation?

A

hydrogen + oxygen -> water

2H2 + O2 -> 2H2O

18
Q

observations of combustion of hydrogen?

A

squeaky pop

19
Q

when metal oxides dissolve in water do they form an acidic or alkaline solution?

A

alkaline

20
Q

when non-metal dioxides dissolve in water do they form an acidic or alkaline solution?

A

acidic

21
Q

what bonding happens between metals?

A

metallic bonding

22
Q

what bonding happens between non-metals?

A

covalent bonding

23
Q

what bonding happens between metals and non-metals?

A

ionic bonding

chemistry (45 decks)

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