Consider the following reactions. (Note: (s) = solid, (l) = liquid, and (g) = gas.)

Mg (s) + ½O2 (g) → MgO (s) + 146 kcal/mole

H2 (g) + ½O2 (g) → H2O (g), ΔH = - 57.82 kcal/mole

The temperature of the surroundings will:

increase

decrease

What were the 3 common states of matter on Earth?

Which layer underground where all empty spaces are filled with a combination of air and water

Which statement best describes the amount of catalyst that remains at the end of a reaction? More catalyst is present at the end than at the beginning of the reaction. Less catalyst is present at the end than at the beginning of the reaction.

Identify all the energy forms associated with the ball at these times: about to be dropped falling down hitting the floor moving back up

Emission of which type of radioactive particle (s) would change the identity of the resulting atom? alpha beta positron gamma ray (it has more than one answer

a 1kg rock is at a height of 100 meters. What is the rocks gravitational potential energy at 100 meters high

Why doesn't the stomach acid just digest right through the wall of the stomach? Select one: a. Neutralizers are imbedded in the stomach lining. b. The lining of the stomach is protected by mucus. c.

If a substance cannot be seperated physically or chemically, it is?

Match each type of sedimentary rock with its composition. 1. mineral crystals clastic sedimentary rock 2. remains of dead creatures organic sedimentary rock 3. weathered rock particles chemical sedimentary rock

A scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. Does this result support the theory of plate tectonics? Why or why not?