The number of protons in an atom of an element always equals its atomic weight.

a. True

b. False

The last element in any period always has: A. two electrons in the outermost energy level B. its outer energy level completed C. the properties of an inert gas D. the lowest atomic weight because it is a gas

Which of the following crystals would be most brittle and hard? Ag ZnS F2 C12H22O11

Which is the best reason for choosing the beaker for heating the solution? The beaker is the only container that can withstand high temperatures. The beaker's wide mouth makes it easier to hold a capillary tube with tongs.

The reactants in a chemical reaction contain 900 J of chemical energy. The products of the reaction contain 9000 J of chemical energy.

Heat is the transfer of what energy?

All of the following are examples of electrolytic solutions, except __. A) Ocean water B) Pure water C) Strong hydrochloric acid D) potassium chloride solution

How many stereoisomers are possible for 1 2-dichlorocyclopentane?

Consider the balanced equation K, Croa (aq) + Pb (NO3) 2 (aq) → PbCrO4 (s) + 2KNO3 (aq) If 25.0 ml of a 1.00M K, Cro, solution is mixed with 10.0 ml of a 0.500M Pb (NO3) 2 solution. a. How many moles of potassium chromate are present? b.

Name 3 organisms that would be classified as eukaryotic, multicellular, and heterotrophic.

A bond formed by electrical attraction between two oppositely charged ions is called