How does an atom become positively charged

According to the tide table below what time of day will the highest tide occur?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solution is