Each statement best explains why it is more difficult to use coal versus other alternate source of energy except: 1. Coal produces more pollutants in the air.

2. It is more difficult to mine for coal than other minerals.

3. Coals are not commonly used because it is more difficult to burn.

4. Coals are not commonly used because it produces more negative impact to the environment.

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.

What conclusion can you draw from this experiment about the components of the black ink?