Week 5 Atoms, Molecules, Elements, Compounds Practice

What is the term for combining 2 or more atoms together?

• atoms
• elements
• molecules
• compounds

What is the term for combining 2 or more DIFFERENT atoms together?

• atoms
• elements
• molecules
• compounds

What is the picture displayed?

• atom
• element
• molecule
• compound

Are these molecules also compounds?

• YES
• NO

Are these molecules also compounds?

• YES
• NO

The element oxygen, represented by the symbol O, is classified as

• a pure substance
• a compound
• a mixture
• a solution

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?

• Hydrogen is an element made of two or more kinds of atoms.
• Hydrogen is a compound made of only one kind of atom.
• Hydrogen is a compound made of two or more kinds of atoms.
• Hydrogen is an element made of only one kind of atom.

Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).

• methane is an element and carbon and hydrogen are compounds.
• carbon, hydrogen, and methane are all elements.
• carbon, hydrogen, and methane are all compounds.
• carbon and hydrogen are elements and methane is a compound.

Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?

• atom
• mixture
• element
• compound

Which of the following cannot be broken down into something simpler?

• A compound

• An element

• A mixture