Clicker #1 You have two beakers on your lab table. Beaker #1 contains 32.07 g of sulfur and Beaker #2 contains 74.92 g of arsenic (As). Which beaker contains the greatest number of atoms? Choose the best answer. A) Beaker #1 because one sulfur atom weighs less than one arsenic atom so you need more of the sulfur atoms to fill the beaker. B) Beaker #1 because it contains more moles of sulfur atoms versus the number of moles of arsenic atoms in Beaker #2. C) Beaker #2 because arsenic has a greater mass than sulfur. D) Beaker #2 because it contains more moles of arsenic atoms versus the number of moles of sulfur atoms in Beaker #1. E) Beakers #1 and #2 contain the same number of atoms because there is one mole in each.

Clicker #2 Does a methane molecule (CH4) consist of more hydrogen or carbon? A) hydrogen B) carbon C) depends

Clicker #3 What is the percent composition (by mass) of carbon in 2 moles of CH4? A) 2.00% C B) 37.45% C C) 74.9% C D) 149.8% C Note: I did not get to this in lecture but I’m posting this anyway for practice

Clicker #4 The molecular formula (actual formula) for water is H2O. What is its empirical formula? A) HO½ B) H2O C) H2O2 D) H4O2 E) Cannot be determined without knowing the percent mass of each.