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January Exams Yr9 > Chemistry > Flashcards

Chemistry Flashcards

0
Q

What is an atom?

A

The simplest part of an element that can exist on its own

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1
Q

What are elements?

A

Materials that cannot be split into anything simpler by chemical methods
They only contain one type of atom

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2
Q

What is a molecule?

A

Has two or more atoms joined together

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3
Q

What are the properties of metallic elements?

A 
Good conductors of electricity 
High melting and boiling points 
Good conductors of heat
Shiny solids
Usually malleable and ductile
All are solids at room temperature except mercury
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4
Q

What are the properties of non metallic elements?

A 
Poor conductors of heat
Low melting and boiling points 
Poor conductors of electricity
Usually dull
Can be gas, solid or liquid at room temperature
Tend to be soft and brittle
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5
Q

What is a compound?

A

A material that is made up of two or more different elements that are chemically joined together

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6
Q

What is a mixture?

A

Two or more substances mixed together which are easy to separate

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7
Q

What is the composition of air?

A

Oxygen-21%
Nitrogen-78%
Argon-0.9%
Carbon Dioxide-0.037%

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8
Q

What are the properties of oxygen?

A

Gas
Colourless
Odourless

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9
Q

What are the uses of oxygen?

A

Welding torches
Rocket fuel
Breathing apparatus in hospitals

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10
Q

What is the equation for respiration?

A

Sugar + oxygen > carbon dioxide + water (+energy)

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11
Q

What is the chemical test for water?

A

Use the chemical anhydrous copper sulphate which changes colour form white to blue in the presence of water

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12
Q

What is the equation for the preparation of oxygen?

A

Hydrogen peroxide >(manganese dioxide)> water + oxygen

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13
Q

What is the test for oxygen?

A

Delights a glowing splint

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14
Q

What is a catalyst?

A

A chemical which speeds up a chemical reaction whit hour being used up itself

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15
Q

Examples of industrial catalysts?

A

Platinum

Iron

16
Q

What is an enzyme?

A

A biological catalyst

17
Q

What are some chemical reactions with enzymes?

A

DNA Replication
Protein Synthesis
Digestion

18
Q

What is the equation for the preparation of carbon dioxide?

A

Calcium carbonate + hydrochloric acid > calcium chloride + carbon dioxide

19
Q

What are the uses for carbon dioxide?

A

Fire extinguishers
Fizzy drinks
Dry ice

20
Q

What happens when calcium carbonate s added to hydrochloric acid?

A

Bubbles of gas

Like water turns milky

21
Q

What are the properties do carbon dioxide?

A

Gas

Flammable

22
Q

What is exothermic?

A

Reaction gives out heat

23
Q

What is endothermic?

A

Reaction takes in heat

24
Q

What is oxidation?

A

Reaction occurs when a chemical reacts with oxygen

25
Q

What is reduction?

A

Occurs when a substance loses oxygen

26
Q

What is redox reaction?

A

A substance which reduces another substance

January Exams Yr9 (10 decks)

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