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Chemical Changes Flashcards

(18 cards)

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1
Q

what is a chemical change

A

change where new substances are formed reactants interact to form products through matter interactions

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2
Q

how does a chemical change differ from a physical change

A

chemical change forms new substances with different properties and may give off heat or light physical change does not form new substances and properties stay the same

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3
Q

what is precipitation

A

process where an insoluble solid forms when two solutions or a solution and substance are mixed

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4
Q

what is a precipitate

A

the insoluble solid formed in a precipitation reaction

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5
Q

what are precipitate reactions

A

salt solution with another salt solution or salt solution with alkali

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6
Q

what is oxidation

A

reaction of a substance with oxygen forming a new substance the substance is oxidised

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7
Q

what is rusting

A

oxidation of iron in the presence of air forming ironIII oxide

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8
Q

what is respiration

A

oxidation of food like glucose to release energy for cells

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9
Q

what is the equation for respiration

A

glucose plus oxygen gives carbon dioxide and water

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10
Q

what is combustion

A

burning of substances in oxygen releasing heat and light

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11
Q

how does oxidation differ from combustion

A

both involve oxygen but combustion needs heat oxidation may not

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12
Q

what is decomposition

A

breaking down of a compound into two or more substances

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13
Q

what is decomposition by light

A

silver bromide in camera film breaks into silver and bromine under light

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14
Q

what is the equation for light decomposition of silver bromide

A

silver bromide gives silver and bromine

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15
Q

what is thermal decomposition

A

heating glucose breaks it into carbon and water

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16
Q

what is the equation for thermal decomposition of glucose

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A

glucose gives carbon and water

17
Q

what is electrolysis

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A

process of breaking down water using electricity to get hydrogen and oxygen

18
Q

what is the equation for electrolysis of water

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A

water gives hydrogen and oxygen

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