Paper 1 Exam Questions Flashcards
1
Q
Explain why sodium oxide has a high melting point (3)
A
Sodium oxide is a giant ionic lattice with strong electrostatic forces between oppositely charged ions so large amounts of energy are needed to break the bonds.
2
Q
Explain why alloys are harder than pure metals (3)
A
In an alloy, the atoms are of different sizes. This means that the layers of atoms in an alloy are distorted. Therefore, in an alloy, the layers slide over each other less easily than in a pure metal.
