Which of the following items represents a chemical change? burning melting evaporation freezing

The physical properties of a compound are similar to those of its elements.

a. True

b. False

Which electron transition represents a gain of energy? A. from 2nd to 3rd shell B. from 2nd to 1st shell C. from 3rd to 2nd shell D. from 3rd to 1st shell

When fossils fuels are burned what is their chemical potential energy converted into?

Match element to how many valence electrons it has Al S Na Si Mg P 4 5 3 6 2

Which substance below has the greatest mass? 1 mole of silver 1 mole of copper 1 mole of lead 1 mol of tungsten

The systematic way to assign names to chemical compounds is called

What is the ratio of effusion rates of krypton and neon at the same temperature and pressure?

Balance the following equation _NaOH (aq) + _HNO3 (aq) > _NaNO3 (aq) + _H2O (1)

Researchers discovered a subatomic partial while working with the cathode ray tube the particle is known as

An electrochemical cell is constructed such that on one side a pure nickel electrode is in contact with a solution containing Ni2 + ions at a concentration of 2 * 10-3 M.

The lines in an element's atomic spectrum result from electron spins going in opposite directions. energy that is spread out among an atom's electrons. electrons moving from a lower to a higher energy level.