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Random Flashcards

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1
Q

What must be present for combustion to take place?

A

Oxygen

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2
Q

What is the formula for nitrogen?

A

N2

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3
Q

What colour is bromine water in alkanes and alkenes?

A

Alkanes - orange

Alkenes - de colourised

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4
Q

What are group 7 elements called?

A

Halogens

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5
Q

What is an isotope?

A

An atom with the same atomic number but different mass number

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6
Q

What does water do to anhydrous copper (II) sulphate?

A

Turns it blue

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7
Q

What is needed in iron to rust?

A

Oxygen and water

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8
Q

What can you coat Iron with to protect rusting?

A

Paint or zinc. Costing with zinc is called galvanising. It works because zinc is more reactive than iron so will corrode first

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9
Q

How is iron extracted?

A

Burning with Carbon or carbon monoxide

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10
Q

What ions are given out in acids?

A

Hydrogen ions

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11
Q

What is the equation for mass, moles and MR?

A

Mass = Mr x Moles

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12
Q

What is the equation for volume, moles and 24?

A

Volume = mol x 24

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13
Q

What do you get with Mg + steam?

A

MgO

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14
Q

What happens to a reducing agent?

A

It becomes oxidised

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15
Q

How to remember enthalpy bond breaking?

A

MEXO BENDO

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16
Q

Where does the haber process get its gases?

A

It takes nitrogen from the air and hydrogen from natural gases

17
Q

what is a covalent bond?

A

A shared pair of electrons

18
Q

What is an ionic bond?

A

The transfer of one electron from one atom to another

19
Q

What is an ion?

A

An electrically charged particle

20
Q

What is metallic bonding?

A

An array of positive ions in a sea of delocalised electrons

21
Q

What is diffusion?

A

The movement of particles from high concentration to low concentration

22
Q

Is exothermic positive or negative?

A

Negative - energy is given out, heat goes up

23
Q

What is ammonia used for?

A

Manufacture of fertiliser, nitric acid and nylon

24
Q

What is the empirical formula

A

The simplest formula

25
Q

What colour is phenolphthalein in acids and alkalis?

A

Colourless in acids

PINK in alkalis

Chemistry (6 decks)

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