The density of ethanol is 0.789g/ml at 20°c. find the mass of a sample of ethanol that has a volume of 150.0 ml at this temperature.

Ac-b=1 what is value of b

Explain how two compounds can have the same percentage composition but different molecular masses?

Use your periodic table of elements. Take any element of your choosing (from period 4 or above) and awnser the following questions: what is the elements name amd symbol? Is it a metal, nonmetal, or metalloid? Which family does it belong to?

What are atomic number

A 8.85 g sample of hydrate of sodium carbonate, Na2CO3 ∙ XH2O was heated carefully until no more mass was lost from the sample. After heating, the final weight of the material was 7.55 g. How many moles of water left the compound? 0 moles

How large a volume is need to contain 21 grams of silver? (info: density of silver is 10.5)

How could Cl change to gain stability? lose 7 electrons gain one electron

Connie was making sodium chloride by adding an acid to an alkali. She followed the progress of the reaction with a pH sensor. At which pH would she know that the acid and alkali had completely reacted to give a salt solution?

Yttrium - 90 has a half life of 64 hours. How much of a 120g sample will remain after 128 hours?

KOH is an Arrhenius and increases the concentration of when added to water. Blank 1: