explain y it is easier to loosen a tight but using a spanner with along handle than with a short handle

Which is not true about oxygen-17 and oxygen-18?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.