When applying heat to a substance changes the form, but not the identity of the substance, this is evidence of:

a chemical change

a physical change

no change

an anthropomorphic change

Which of the following would have the greatest reaction speed? A. A reaction with solid reactants under low pressure and with high surface area. B. A reaction in cold temperature and high surface area with gaseous reactants. C.

Which chemical species can easily form an ionic bond with a cation? Sr Ne NH4+ PO43-

How many ions are present in 9.4g of pottasium oxide K2O? (K=39, O=16) (Avogadros constant=6.0*10^23/mol)

How many atoms are in 131.97 liters of water vapor at STP? A) 6.023 * 1023 B) 3.54846 * 1024 C) 3.548 * 1024 D) 1.0645 * 1025

Convert 3.5 mol to umol

Round each figure to three significant figures

How long does it take earth to complete one rotation

What are the relative numbers of h3o + and oh - ions in an acidic and alkaline and a neutral solution?

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