Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

What is the systematic name of the following compound? Al4O3

As the hydronium ion concentration of a solution increases, does the ph of the solution increase or decrease

Isopropyl alcohol (C3H8O) is a common solvent used for cleaning and disinfectant purposes. Its mass spectrum is shown below.

What is something that is not moving with respect to an observer that can be used to detect motion

If the temperature of air in gabor's lungs is 37∘c (98.6∘f), and the volume is 6l, how many moles of air n must be released by the time he reaches the surface? let the molar gas constant be given by r = 8.31 jmol⋅k.

The temperature of 15 grams of water increases by 3.0 degress. how much heat was absorbed by water?

What are the four types of stoichiometry problems?

100 ml oxygen at 1.75 atm and 200ml nitrogen at 0.6 atm are passed to a 500 ml vessel. Calculate the total pressure of the mixture in the vessel at same temperature

Which is the best metal to use in an alloy to increase its electrical conductivity

Ice does not need to melt into liquid water before it can return to the atmosphere as water vapor. a. True b. False