Which formula represents a polar molecule?

(1) Br2 (3) CH4

(2) CO2 (4) NH3

Choose the correct statement. The cathode is the electrode where the oxidation takes place. Both oxidation and reduction may take place at the cathode, depending on the cell. The cathode is always positive. The anode is always negative.

Convert 27.8 years to seconds.

What is 1,900,000 cm^3 to g?

What is the name of CH3CH (OH) CH2CH2CH3?

Match each set of energy sublevels to the principal energy level that contains them. S sublevel S and p sublevel S, p, and d sublevel Third energy level First energy level Second energy level

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?