What information guided Mendeleev as he placed elements in his periodic table

How much of 90% ethanol must be mixed with 10% ethanol to make 1 pint of a 40% ethanol solution?

Abbrevation of mass in the si unit

Which element has an electron configuration of [Kr]5s2

My question is, that it's asking us to tell whether the partial pressure of a molecule will increase decrease of remain the same and to show it by a calculation? I don't which calculation to use. I have V T P and grams.

Why don't the chocolate chips melt when making cookies

Chloroform was used as an anesthetic for childbirth and surgery during the nineteenth century. Write the molecular formula of chloroform.

Why are alloys generally used to make everyday objects

What types of matter could be separated by physical methods?

What information does a net ionic equation give that a complete ionic equation does not show

What is the molality of a solution containing 4.0 moles of solute in 3.2 kg of solvent? Round to the nearest tenth. Don't forget the units.