What 4 elements did people at ancient greek time believe that all matter is made up?

This element has an atomic number lower than that of aluminum and one less valence electrons then the Group 16 elements

Which statement correctly compares a hypothesis and a theory?

How much energy is required to melt a 500. gram block of iron? The heat of vaporization is 6090 J/g and the heat of fusion is 247 J/ g. 3.05x106 J 1.23x105 J 6.09x103 J 2.47x102 J

A chemical bond formed by the transfer of electrons is a

True or false: Objects that are neutrally charged have no electrical charges present.

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2

Would Mn (HPO4) 2 be manganese (II) monohydrogen phosphate?

The fundamental frequency of a violin string is 440 hz. the frequency of its second harmonic is

How much of a 15.0M stock solution do you need to prepare 250ml of a 2.35ml hf solution?

A synonym for dwindled