Which property of a substance is not affected by physical changes?

A) reactivity

B) size

C) shape

D) position

Types of fossil fuels include: hydrogen oil carbon dioxide wind coal natural gas ammonia (mark all answers that apply)

What did J. J. Thomson's experiments with cathode ray tubes imply about the mass of an electron? A. Electrons are many thousand times larger than the nucleus and negatively charged. B.

If an atom has an electron in the n = 4 state with ml = 2, what are the possible values of l?

Why are mixtures (such as sugar in water) not given chemical formulas?

Arrange the following compounds from left to right in order of increasing percentage by mass of hydrogen: a) H2O, b) C12H26, c) N4H6, d) LiH.

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?