Fill in the missing words: When two oxygen atoms bond, the atoms ________ electrons. The oxygen atoms are joined by ________ bonding.
Share; covalent.
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Fill in the missing word(s): The particles lost when a gold atom becomes a gold ion are called ....................................................... .
Electrons.
2 of 11
How does a catalyst help a reaction?
A catalyst changes rate of reaction or speeds up reaction.
3 of 11
Fill in the missing word(s): When heated, a thermosoftening polymer will _______.
Melt.
4 of 11
What does the symbol ⇌ mean?
Reversible.
5 of 11
Graphite is used in pencils. Explain why.
Layers can slide / slip because there are no bonds between layers.
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Give two advantages of gas chromatography compared with paper chromatography.
Any two from: It is rapid / quick accurate sensitive or detects very small quantities.
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Fill in the missing word(s): Oxygen atoms with different numbers of neutrons are called ________.
Isotopes.
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Fill in the missing word(s): The bonds in a water molecule are formed by _______ electrons.
Sharing.
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What is the ionic equation for the neutralisation reaction?
H+ + OH– → H2O
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The formula of sodium chloride is NaCl. Calculate the relative formula mass of sodium chloride. Relative atomic masses: Na = 23; Cl = 35.5
Relative formula mass = 58.5 (23 + 35.5).
11 of 11
Other cards in this set
Card 2
Front
Fill in the missing word(s): The particles lost when a gold atom becomes a gold ion are called ....................................................... .
Back
Electrons.
Card 3
Front
How does a catalyst help a reaction?
Back
Card 4
Front
Fill in the missing word(s): When heated, a thermosoftening polymer will _______.
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