Atomic structure, analysis and quantitive chemistry Flashcards Preview

GCSE Chemistry Unit 2 > Atomic structure, analysis and quantitive chemistry > Flashcards

Flashcards in Atomic structure, analysis and quantitive chemistry Deck (9)
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1

Explain why the mass number of oxygen is 16.
You should refer to the numbers of sub-atomic particles in the nucleus of the atom. [2]

there are 8 protons and 8 neutrons (in the nucleus)

2

Explain why carbon-12 and carbon-14 are isotopes of carbon.
You should refer to the numbers of sub-atomic particles in the nucleus of each isotope. [3]

- both atoms have the same number of protons
- carbon-12 has 6 neutrons
- carbon-14 has 8 neutrons

3

One mole of a substance is the relative formula mass in ______.
The relative atomic mass of an element compares the mass of an atom of an element with the mass of an atom ______. [2]

- grams
- carbon-12

4

Metal oxides react with acids to make salts.
What type of compound is a metal oxide? [1]

base

5

State how solid lead nitrate can be obtained from lead nitrate solution. [1]

by evaporation / crystallisation

6

Why do different compounds separate in a gas chromatography column? [1]

different substances travel at different speeds

7

Give one reason why the calculated yield of magnesium might not be obtained. [1]

- the reaction is reversible
- some get lost / released
- some of the reactant may react in different ways

8

What is the purpose of gas chromatography? [1]

to separate

9

What information do the molecular ion peaks from the mass spectrometer give about the substances? [1]

(relative) molecular mass