Which of the following statements describes the difference between a mixture and a pure substance?
A. A mixture tends to be homogeneous, while a pure
substance tends to be heterogeneous.
B. A mixture has a specific melting point, while the
melting point of a pure substance can vary.
C. The density of a mixture can change with temperature,
but the density of a pure substance cannot change.
D. The composition of a mixture can vary from sample to
sample, but the composition of a pure substance is
always the same.

What three things determine the shape and size of a puddle when water is poured out onto a surface

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.

Adepositional also feature that forms where a stream enters a lake or an ocean is a