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Science - Year 8 > Chemistry #2 > Flashcards

Chemistry #2 Flashcards

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1
Q

Radiation

A

An unstable nucleus emits excess energy as radiation in the form of gamma rays or fast-moving sub-atomic particles

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2
Q

Exothermic

A

describes chemical reactions that give out heat energy to the surroundings

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3
Q

Endothermic

A

describes chemical reactions that absorb heat energy from the surroundings

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4
Q

State

A

the condition in which matter exists

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5
Q

(L)

A

liquid

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6
Q

(g)

A

gas

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7
Q

(aq) / aqueous

A

aqueous - dissolved in water

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8
Q

(s)

A

solid

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9
Q

Reactants

A

what is being formed by a chemical reaction

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10
Q

product

A

it is what is formed after a chemical reation

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11
Q

precipitate

A

an insoluble solid that emerges from a liquid solution

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12
Q

Law of Conservation of Mass

A

law that states that, in a chemical reaction, the total mass of the reactants is the same as the total mass of the products

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13
Q

Law of Constant Proportions

A

law that states that, in chemical compounds, the ratio of the elements is always the same

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14
Q

Chemical Process

A

a reaction that changes the arrangement of the atoms or molecules of the substances involved

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15
Q

Chemical Energy

A

energy stored in chemical bonds that is released during chemical reactions

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16
Q

Synthesis Reaction

A

Synthesis reactions occur when two chemicals combine to form one larger chemical

17
Q

Decomposition Reaction (opposite of synthesis reaction)

A

Decomposition Reactions occur when one chemical breaks up to form two or more smaller chemical

18
Q

Combustion Reactions

A

If you’ve got something organic (something that contains both carbon and hydrogen atoms) that reacts with oxygen to form carbon dioxide and water vapour (plus lots of energy).

19
Q

Single Displacement Reactions

A

Single displacement reactions occur when the atoms of a pure element replace those of an element in a chemical compound.

20
Q

Double Displacement Reaction (precipitation reaction)

A

A Double Displacement Reaction is when the cations of two ionic compounds switch places.

21
Q

Acid-Base Reactions

A

Acid_Base reactions are just double displacement reactions in which water is formed. Example: When you eat chili and use milk to cancel out the stomach pain, which is a Acid-Base reaction

Science - Year 8 (2 decks)

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