What parts of an atom make up almost all the mass of the atom?

What is the name of the elements between the metals and non metals

How many grames. Is 3 moles of H2O

Explain how elements are arranged on the periodic table. What does the table tell you when you read it like sentences in a book - left to right, and to bottom.

A reaction requires 22.4 L of gas at STP. You have 25.0 L of gas at 101.5 kpa and 373 K. Which of the following statements is true? (Use the ideal gas law: PV=nRT where R=8.31 L-kpa/mol-K)

how many moles of water are in 1.23 x 10^18 water molecules? I need the answer in scientific notation?

Determine the name of the compound Li2O

Complete the reactions to show how butanoic acid may be converted to phenyl propyl ketone.

As a sample of the radioactive isotope 131I decays, its half-life (1) decreases (2) increases (3) remains the same

How many Joules of energy are required to change 10.0 gram of ice at - 2.0 C to water at 20.0 C? (use your constants) 440 J 66,000 J 880 4220 J

Why are Van der Waals forces important? A) They determine how strong dipole moments will be in polar covalent molecules B) They are the strongest type of intermolecular force that can act on polar and non-polar molecules C) They are primary