Different substances have characteristic melting and boiling points, depending on the strength of the bonds or forces holding them together.
Which explains why methane has a lower melting point than sodium chloride?
Covalent bonds are weaker than ionic bonds
Intermolecular forces are weaker than ionic bonds
Covalent bonds are stronger than ionic bonds
Intermolecular forces are stronger than ionic bonds
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Element X has the following properties:
Which is most likely to be element X?
Sodium
Magnesium
Carbon
Oxygen
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Sodium chloride is often known as 'table salt'.
Which compound represents sodium chloride?
| Conducts electricity when solid | Conducts electricity when molten | State at room temperature and pressure | Can be bent or shaped | |
| A | Yes | Yes | Solid | Yes |
| B | No | No | Solid | No |
| C | No | Yes | Solid | No |
| D | No | No | Solid | Yes |
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Salol is solid at room temperature but had a low melting point, so is often used to study changes of state.
Which of the statements about this graph is not true?
(1) represents energy being absorbed by the salol during melting
(2) represents the salol as a liquid
(3) represents energy being transferred to the surroundings during boiling
(4) represents salol as a gas
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Limewater is the common name for calcium hydroxide solution, Ca(OH)2 (aq). It is commonly used as a test for carbon dioxide, whereupon the following reaction occurs:
Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l)
Which of the following statements is not true about the reaction?
Calcium hydroxide is dissolved in water
One product is a gas
The solution will turn cloudy
The solution will become increasingly dilute during the reaction
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