Does the air get denser as a cold front passes?

An observation that does not deal with numbers?

with a suitable reaction equation, show the liberation of hydrogen gas in a reaction between silver metal and hydrochloric acid

how many moles of water are in 1.23 x 10^18 water molecules? I need the answer in scientific notation?

A sealed beaker of what you are told is aqueous nickel sulfide was given to you by the local chemist and you put it on the window sill. after a few days, you notice that the mixture is getting thick toward the bottom.

What is water classified as

What water activities might be easier to do in Lake Assal's salty water? What activities could be more difficult?

The suffix "-megaly in the term gastromegaly means:

The harder you strike a drum, the greater the sound's A) medium B) volume C) frequency D) pitch

The equation X + Y 2Z has the rate law equation shown below. Which of the following statements best describes the relationship of X on the rate of the reaction? rate = k[X]2[Y] Changing X has no effect on the reaction rate.

What moves in or out of a substance during a change of state?