Which of the following is a strong base?

A. NH3 (ammonia)

B. H20 (water)

C. CaCO3 (calcium carbonate)

D. NaOH (sodium hydroxide)

How many moles of chlorine are in 100 g chlorine (cl) ?

The phase change in which a substance changes from a gas directly to a solid is A. condensation. B. vaporization. C. deposition. D. sublimation.

Which choice below would affect the rate of reaction in the opposite way from the other four? a. Cool the reaction down b. Add a catalyst c. Decrease the pressure d. Use larger pieces of solid reactants e. Decrease the concentration of the reactants

When studying the movement of heat, what does the term "system" refer to? What does "surroundings" refer to?

Newtons second law practice

In what ways are polyatomic ions like simple ions

How does oxygen obey the octet rule when reacting to form compounds? A) It gains electrons. B) It gives up electrons. C) It does not change its number of electrons. D) Oxygen does not obey the octet rule.

Which equation obeys the law of conservation of mass? A. 2Fe+3O2 - -> 2Fe2O3 B. 4Fe+O2--> 2Fe2O3 C. Fe+O2--> Fe2O2 D. 4Fe+3O2--> 2Fe2O3

Why do airbags fill evenly with gases?

In which of the following reactions will Kc = Kp? In which of the following reactions will Kc = Kp? (A) SO3 (g) + NO (g) ↔ SO2 (g) + NO2 (g) (B) 2 N2 (g) + O2 (g) ↔ 2 N2O (g) (C) 4 NH3 (g) + 3 O2 (g) ↔ 2 N2 (g) + 6 H2O (g) (D) 2 SO2 (g) + O2 (g) ↔ 2