Which of the following is NOT a chemical reaction?

a. ice melts from water

b. ammonia breaks up into nitrogen and hydrogen

c. hydrogen and oxygen combine to make water

What is the correct mathematical relationship between the number of moles, the volume, and the standard molar volume of a substance?

Which statement about gas effusion is true? A. Lighter gases effuse faster than heavier gases. B. Lighter gases effuse slower than heavier gases. C. Effusion is not related to the molar mass of gases. D. Light and heavy gases effuse at the same rate.

When light energy hits matter what energy is formed?

Using the following balanced equation: 2 NaOH (aq) + H2SO4 (aq) → 2 H2O (l) + Na2SO4 (aq). How many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid?

A sample of H2SO4 contains 2.02 g of hydrogen, 32.07 g of sulfur, and 64.00 g of oxygen. How many grams of sulfur and grams of oxygen are present in a second sample of H2SO4 containing 7.27g if hydrogen

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

Which tool is most suitable for a chemist to measure the mass of a liquid

What is the equation adheres to the law of conservation of matter