2.2 Simple Molecules Flashcards Preview

GCSE Chemistry 2.2 Structure and Properties > 2.2 Simple Molecules > Flashcards

Flashcards in 2.2 Simple Molecules Deck (9)
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1
Q

How are atoms within a molecule held together?

A

By strong covalent bonds

2
Q

Why do simple molecules have little attraction for each other?

A

The covalent bonds act only between the atoms in the molecule, and they have weak intermolecular forces

3
Q

Why do simple molecules not carry electricity?

A

They don’t have an overall charge so can’t carry an electrical charge

4
Q

Why do substances made of simple molecules have low melting and boiling points?

A

They don’t require much energy to break the intermolecular forces

5
Q

Why does petrol not conduct electricity?

A

Petrol is made from hydrocarbons which are covalently bonded so it doesn’t have an overall charge so it can’t carry and electrical charge

6
Q

Name 3 simple molecules that are gases at room temp? Why?

A
  • h2
  • O2
  • CH4

Because they have very weak intermolecular forces that require almost no energy to break them as they are very small molecules

7
Q

Why are larger simple molecules liquid or even solid at room temp?

A

They have stronger attractions as they are larger molecules

8
Q

Name 2 forces acting on simple molecules to hold them together

A
  • strong covalent bonds hold the atoms together

* weak intermolecular forces hold the molecules together

9
Q

Which are stronger, electrostatic forces or covalent bonds?

A

Covalent bonds are the strongest type of bonds