Question

Which of the following has the greatest mass, in grams?

A.) 0.5 mol lead (Pb) atoms

B.) 1 mole of hydrogen (H) atoms

C.) 1 atom of silver (Ag)

D.) 25 atoms of iron (Fe)

ALSO (BEST ANSWER)

Often, scientists who want to demonstrate chemical bonding use models with colored balls to represent atoms. What are the chemical models of bonding based on?

A.) scientific data that has been gathered by experimentation

B.) the work of JJ Thompson, creator of the Plum-Pudding model

C.) philosophical discourse since atoms are submicroscopic

D.) photographs of atoms that show their different colors and sizes

Could you please explain them both;

Thank You =)

Answers

A and C. Lead is more toward the bottom of the periodic table therefore it is heavier than all other elements. Also .5 molar is more that 25 atoms. The answer to the other question is process of elimination. At the atomic level there is no color nor light. Structure of atoms and molecules is determinded through reasoning of how they react.

#1

A and A

#2

A) mass Pb = 0.5 mol x 207.2 g/mol=103.6 g => your answer

B) mass H = 1 mol x 1.008 g/mol= 1.008 g

C) mass of one atom of Ag = 107.868 / 6.02 x 10^23 = 1.79 x 10^.22 g

D) mass of 25 atoms of Fe = 55.847 x 25 / 6.02 x 10^23 =2.32 x 10^-21 g

A)

#3