Notes, summaries, assignments, exams, and problems for Secondary education

IONIC: thet are solids at room temperatures and have medium to high meltin and boiling points. Ionic bond is strong because it is electrostatic. They are very hard. It is not eassy to scratch an ionic compound. They are fragile. Hitting them forces ions with the same signs together, and they repel and break the crystal. Most disolve well in water, water molecules may surround the ions,weakening their bonds and separating them from the crystal lattice. This is called solvation. They do not conduct electricity well in solid state but hey do in solution or liquid state. SODIUM CHLORIDE

1. I've never failed an exam, though I only scrape through sometimes!

2. After high school, he went on to do a course in Accountancy.

No answer. System answer is: went

3. I fell behind in Maths after I was ill for two weeks, but now I've caught up.

4. When Yen's older, she wants to go into teaching.

5. My English teacher was great, she never gave up on me, even when I didn't make much progress.

6. At university, Alex wants to major in law, but he wants to study a language too.

7. I argued with my sister and then found it hard to settle down to study. I couldn't concentrate.

• 2

  Didn't you

  No answer. System answer is: use

  use

  to skip lessons occasionally when you were at school, Dad?

• 3

  The security guard does

  No answer. System answer is: not

  not

  unlock