Chemical Formulas

List the following in order from lightest to heaviest: atom, electron, proton, neutron.

• electron, proton, neutron, atom

• proton, electron, neutron, atom

• neutron, proton, electron, atom

• atom, electron, proton, neutron

How many atoms of hydrogen are in a molecule of water (H2O)?

• 2

• 1

• 3

• 4

How many atoms of carbon are in a molecule of glucose (C6H12O6)?

• 6

• 12

• 24

• 3

Fill in the blank: The symbol for Lithium is ___.

• Li

• Lh

• Lt

• Lm

Fill in the blank: The symbol for Calcium is ___.

• Ca

• Cl

• C

• Cu

2 atoms of Hydrogen + 1 atom of Oxygen = ____ molecule of Water

• 1

• 2

• 3

• 4

How many different elements are present in the molecule?

• 2

• 1

• 3

• 4

Name the elements present in this compound.

• Carbon, hydrogen

• Oxygen, nitrogen

• Sulfur, phosphorus

• Sodium, chlorine

What is the chemical formula for this compound?

• H2O

• CO2

• NaCl

• CH4

For the compound Methane (CH₄), fill in the number of each element.

• 1 Carbon, 4 Hydrogen

• 2 Carbon, 2 Hydrogen

• 1 Carbon, 2 Hydrogen

• 4 Carbon, 1 Hydrogen