Why is it important to seal the mouth of the test tube

Consider the following equilibrium between N2O4 and NO2.[Heat is added to a brown 2 NO2 gas to yield a colorless N2O4 gas]Which condition would cause the reaction to become darker brown? a. Low temperatureb. High pressurec. Small volumed.

The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below. If the rate of appearance of Cr2 (SO4) 3 is 1.

If you combine solutions of metal cations with various anion solutions. Based on what you know about soubility rules for which of the following combinations do you expect to observe the formation of a precipitate? Select all that apply. a.

Water (2350 g) is heated until it just begins to boil. If the water absorbs 5.83*105 J of heat in the process, what was the initial temperature of the water? Express your answer with the appropriate units.

A chemist prepares a solution of copper (II) fluoride by measuring out of copper (II) fluoride into a volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's copper (II) fluoride solution.

Where are two places that scientists obtain scientific knowledge

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.

Describe the attraction between 2 atoms as a result of sharing electrons

I need to know about mitosis and meiosis

What is sediment and debris, and what role does it play in the way sedimentary rock forms?