Which of the following elements may occur in the greatest number of different oxidation states?

(A) C

(B) F

(C) O

(D) Ca

(E) Na

What question could you ask about the components of two atoms to find out if the atoms are of the same elements or of different elements

1. What is true about the atom?

Distinguish between extensive and intensive properties. give three examples of each

A sample of 9.3 grams of NaOH is dissolved into 555 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 2.25 gallons of water. (You may assume that the two volumes can be added.

Calculate the hydrogen ion concentration [H+] for the pH value of 1.1.

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?