What happens immedialety happens before a volcano erupts?

A. magma collects in the mantle

B. lava hardens to form volcanic rock

C. expanding gases push magma through the pipe

D. the temperature in the magma chamber decreases

3) How does air pressure change?

Match Match the action to the effect on the equilibrium position for the reaction N2 (g) + 3H2 (g) ⇌ 2NH3 (g). Match Term Definition Removing ammonia A) Shift to the left Removing hydrogen gas B) No effect Adding a catalyst C) Shift to the right

Which pair of atoms has the highest electronegativity difference? A. H - S B. H - Cl C. N - H D. O - H E. C - H

Which statement describes electrolysis? (1) Chemical energy is used to produce an electrical change. (2) Chemical energy is used to produce a thermal change. (3) Electrical energy is used to produce a chemical change.

7. Define electronegativity

How many protons are in an element

Which of the following is an example of oxidation? A. Charcoal is placed on a grill and lighting fluid poured over it. B. A car gets rusty over the course of a few years. C.

The metric unit of force is the A. gram. B. kilogram. C. nanometer. D. newton.

Why can endothermic reactions be spontaneous? g?

What requirements must a molecule meet in order to be considered nonpolar?