There have been at least five mass extinction events on earth.

True or False?

Water has what type (s) of properties? a. physical onlyB. chemical onlyC. physical and chemical

To keep them from reacting, some highly reactive elements are stored in?

What is the electrode in the center of the most common dry cell made of?

What is the role of the solid-state catalyst in the Haber process? A) It increases the amount of ammonia produced per unit time. B) It increases the total amount of ammonia produced.

Which statement identifies the function of a cathode in every electrochemical cell?

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?