Stoichiometry: Chemistry for Massive Creatures

What is the relative atomic mass of oxygen?

• 8 amu

• 16 amu

• 17 amu

• 18 amu

The average atomic mass of all of the naturally occurring isotopes of a given element is called ___

• the isotope number

• stoichiometry

• relative atomic mass

• the basic atomic mass unit

All of the natural carbon on Earth occurs as one of three isotopes, each with ___

• a mass of 12.01

• six neutrons

• six protons

• 12 protons

How many molecules of oxygen are required to burn one molecule of sucrose?

• 1

• 5

• 11

• 12

The science of measuring chemicals that go into and come out of any given reaction is called ___

• meteorology

• atomic mass measuring

• molar metrology

• stoichiometry

When writing a reaction out as an equation the number of atoms of each element has to ___

• be larger on the reactant side

• be exactly the same on both sides

• be larger on the product side

• include the element carbon

In what year were isotopes discovered?

• 1812

• 1869

• 1912

• 1961

In order to burn 5 grams of sugar, Hank calculated that he would need to inhale about ___

• 5 breaths

• 35 breaths

• 350 breaths

• 530 breaths

Since 1961, a single amu has been defined as the mass of ___

• a hydrogen atom

• 1/16th of an oxygen atom

• 1/12th of an atom of carbon-12

• 1/18th of an atom of oxygen-18

One mole of hydrogen weighs 1.008 g, a mole of iron weighs ___

• 12.01 g

• 16.00 g

• 26 g

• 55.85 g