Write in the vocab term for each definition listed. write your vocab terms in all lower case letters.
1. a type of covalent bond where electrons are shared unequally
2. the tendency of an atom to attract electrons towards itself
3. a bond that forms between an electronegative atom and a hydrogen atom with a positive dipole
4. a type of covalent bond where electrons are shared equally

1. polar covalent bond

2. electronegativity

3. hydrogen bonding

4. nonpolar covalent bond

Explanation:

1. A type of covalent bond where electrons are shared unequally. polar covalent bond. In this kind of bond, there is a negative charge density over the more electronegative atom and a positive charge density over the less electronegative atom.

2. The tendency of an atom to attract electrons towards itself. electronegativity. Atoms with higher electronegativity have a higher tendency to attract electrons towards itself.

3. A bond that forms between an electronegative atom and a hydrogen atom with a positive dipole. hydrogen bonding. This is an especially strong kind of dipole-dipole interaction.

4. A type of covalent bond where electrons are shared equally. nonpolar covalent bond. Atoms have the same (or similar) electronegativity so the electrons are shared equally.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.