Exploring Chemistry Concepts

What is the first element on the periodic table?

• Oxygen

• Carbon

• Helium

• Hydrogen

How many elements are in the periodic table?

• 120

• 115

• 100

• 118

What is the smallest unit of an element?

• atom

• compound

• molecule

• ion

What do we call a substance made of two or more different elements?

• Element

• Mixture

• Compound

• Solution

What is the chemical formula for water?

• H2O2

• HO2

• H2O

• O2H

What is the charge of a proton?

• 0 elementary charge

• +2 elementary charge

• +1 elementary charge

• -1 elementary charge

What is the difference between an atom and a molecule?

• A molecule is always larger than an atom, regardless of the element.

• An atom is a group of molecules, while a molecule is a single element.

• An atom is a single unit of an element, while a molecule is a group of two or more atoms bonded together.

• Atoms can exist independently, but molecules cannot.

What is the term for a substance that cannot be broken down into simpler substances?

• Element

• Mixture

• Solution

• Compound

What is the chemical symbol for gold?

• Fe

• Ag

• Au

• Pb

What do we call a group of atoms bonded together?

• Molecule

• Ion

• Compound

• Element