What happens to water when it freezes?

Its mass increases.

Its mass decreases.

Its density increases.

Its density decreases.

An elimination reaction can best be described as a reaction in which an elimination reaction can best be described as a reaction in which a hydrocarbon reacts with oxygen to produce co2, h2o, and energy.

The Ksp expression for the system PbCl2 (s) Pb+2 (aq) + 2 Cl - (aq) is:

The mass of the ocean is about 1.8 1021 kg. if the ocean contains 1.076% by mass sodium ions, na+, what is the mass in kilograms of na + in the ocean?

Phenolphthalein would not be an appropriate indicator to use to determine the Ka1 of phosphoric acid Why not? what indicator would be appropriate?

In a cell, what is the function of the Cell Membrane? A. It only maintains the cell shape B. It removes waste and stores ingested food C. It controls entry and exit of substances D. It generates energy for the cell

A chemical engineer is developing a process for producing a new chemical. One step in the process involves allowing a solution of potassium hydroxide to react with a solid. Which action would most likely increase the reaction rate for this step?

Determine which elements are balanced and unbalanced for each chemical equation below when every compound is given a coefficient of one.

A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is salt and Solution B is salt. She wants to obtain ounces of a mixture that is salt.

Reactions that affect the nucleus of an atom are called? A. Fusions B. Radioactive decays C. Nuclear reactions D. Fissions

The amplitude of a wave is most directly related to what wave characteristic? Crest length Frequency Wavelength Wave height