Understanding Chemical Formulas

What does a chemical formula like H2O tell us about a substance?

• The temperature at which it melts

• The taste of the substance

• The elements present and their quantities

• The color of the substance

In a chemical formula, what does a subscript indicate?

• The number of atoms of the element

• The type of bond between atoms

• The weight of the element

• The charge of the element

If an element symbol in a chemical formula has no subscript, what does it imply?

• There are no atoms of that element

• There is one atom of that element

• The element is not present

• The element is in excess

What are the elements present in table salt (NaCl)?

• Nitrogen and Chlorine

• Sodium and Carbon

• Nitrogen and Carbon

• Sodium and Chlorine

How many atoms of each element are present in NaCl?

• Four atoms of each element

• Two atoms of each element

• One atom of each element

• Three atoms of each element

What is the difference between CO and Co in chemical formulas?

• CO is a compound, Co is an element

• CO is carbon monoxide, Co is cobalt

• CO is cobalt, Co is carbon monoxide

• Both are the same

How many total atoms are present in the formula CO2?

• Five atoms

• Two atoms

• Three atoms

• Four atoms

What elements are present in glucose (C6H12O6)?

• Carbon, Nitrogen, and Oxygen

• Carbon, Hydrogen, and Oxygen

• Hydrogen, Nitrogen, and Oxygen

• Carbon, Hydrogen, and Nitrogen

How many atoms of hydrogen are present in glucose?

• 6 atoms

• 12 atoms

• 24 atoms

• 18 atoms

What is the total number of atoms in the glucose formula C6H12O6?

• 24 atoms

• 26 atoms

• 18 atoms

• 20 atoms