1 f Ionic bonding Flashcards
The bonding in a hydrogen molecule is strong. Explain why the boiling point of hydrogen is low
- Weak forces of attraction between molecules
- Little energy needed to overcome them
Explain how two atoms in a chlorine molecules are held together
-Strong attraction between shared pair of electrons
-And the nuclei of both atoms
-Shared pair of electrons
-Strongly attracted nuclei
Explain why silicone dioxide has a high melting point
-Covalent bonds have to be broken
-Large amount of energy required to break those bonds
Suggest why the melting point of silicon dioxide is higher than the melting point of sodium chloride
-Covalent bonding is stronger than ionic bonding
State why sodium chloride conducts electricity when molten
Ions can move
Carbon dioxide is a simple molecular substance, state why its a gas at room temp.
Weak forces of attraction
Describe in terms of electrons what happens when calcium reacts with chlorine
-Calcium loses electrons
-Chlorine gains electrons
-Two atoms of chlorine each gain 1 electron
Describe a test for calcium ions
-Flame test
-Orange red flame colour
Describe test for chloride ions
-Add silver nitrate
-White precipitate
Describe one way to make solid calcium chloride conduct electricity
-Heat
-Until it melts
What does Mg 2+ and NO3 - form
Mg(NO3)2
What does Al 3+ and CO3 2- form
Al2(CO3)3
What does NH4 + and S 2- form
(NH4)2S
Give the name of the formula NH4NO3
Ammonium nitrate
State the meaning of the term ionic bond
-Electrostatic force of attraction
-Between oppositely charged ions
Whats the name of NH4Cl
Ammonium chloride
Whats the formula for ammonium carbonate
(NH4)2CO2
Write the chemical equation for ammonia + sulfuric acid -> ammonium sulfate
2NH3 + H2SO4 -> (NH4)2SO
Describe test for ammonium ions
-Add sodium chloride
-Test with damp red litmus paper
-It turns blue
