Which statement best characterizes chemical reactions?

They always occur very quickly.

Their rates vary significantly.

Their rates are always slow.

They rarely occur in the natural environment.

Why is it important for the pH of blood to remain constant?

an experiment calls for 50 ml of a 0.50M aqueous solution of a sodium bicarnonate. Work with your group to describe the steps you would use in order to make up such a solution making sure you have none left over

In an oxidation-reduction reaction, the reducing agent In an oxidation-reduction reaction, the reducing agent gains electrons and loses potential energy. loses electrons and loses potential energy. gains electrons and gains potential energy.

How could you distinguish between the gases h2 and no2?

What are the abiotic factors a polar bear needs to survive in the tundra?

Sodium can achieve greater stability in its valence shell by

Resonance in air columns is used in which of these musical Instruments?

A student prepared a standard stock copper (II) sulfate solution with an absorbance value of 0.862. The student then decided to prepare a second solution containing copper (II) sulfate from the standard stock solution.

How do the results for methane compare to those for butane? does your experimental data verify charles's law?

How many grams of naoh would be needed to make 0.50 l of a 1.25 molar naoh solution? 2.5 grams 16 grams 25 grams 12 grams?