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chemistry Ocr A > Module 2:section 1 Atoms and reactions > Flashcards

Module 2:section 1 Atoms and reactions Flashcards

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1
Q

Where is the mass concentrated in an atom and what makes up most of the volume of an atom?

A

Nucleus

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2
Q

Explain the term atomic number

A

The number of protons in the nucleus

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3
Q

Explain the term mass number

A

The total number of neutrons and protons

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4
Q

Define the term isotopes

A

Atoms of the same element with same atomic number but different mass number

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5
Q

What particle did JJ Thomson discover?

A

Electrons

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6
Q

Explain what is relative atomic mass

A

Mean mass of an atom of an element compared to 1/12th the mass of carbon-12.

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7
Q

What is relative isotopic mass?

A

Mass of an atom of an isotope compared with 1/12th the mass of an atom of carbon-12

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8
Q

What is the equation for working out the number of moles of something from a given mass?

A

Moles = mass/RAM

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9
Q

What volume does 1 mole of gas occupy at room temperature?

A

24dm3mol-1

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10
Q

Define empirical formula

A

The smallest whole number ratio of atoms of each element in a compound

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11
Q

What charge do the ions formed by Group 7 elements have?

A

-1

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12
Q

What is the formula for the hydroxide ion?

A

-

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13
Q

Define an acid

A

Releases H+ ions in aqeous solution

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14
Q

Define an alkali

A

Releases OH- ions in aqeous solution

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15
Q

Name 3 common acids

A

Hydrochloric acid
Sulfuric acid
Nitric acid

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16
Q

What products are formed when an acid and alkali react?

A

Salt + water

17
Q

What equation links the number of moles ,concentration and volume?

A

moles = conc x volume

18
Q

How many products are there in an addition reaction?

A

one

19
Q

Why do reactions with high atom economy save chemical companies money and cause less environmental impact?

A

Because there is less wasted

20
Q

Is an oxidising agent reduced or oxidised in a redox reaction?

A

Reduced

21
Q

Would the oxidation number of an element that is reduced get bigger , smaller or stays the same?

A

Bigger

chemistry Ocr A (4 decks)

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