Which choice best compares these two observations? A) Observation 1. describes a physical change, and Observation 2 describes a
chemical change.
B В
Observation 1 describes a chemical change, and Observation 2 describes a
physical change.
Each observation describes a physical change.
D Each observation describes a chemical change.

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat