Atoms and Elements and Compounds

What is a compound?

• an atom with more electrons than protons
• a substance in which the atoms of two or more elements are combined together
• an atom with more neutrons than protons
• a substance in which the atoms of three or more elements are combined together

Tags

NGSS.MS-PS1-1

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

Tags

NGSS.MS-PS1-1

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

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

What is the picture displayed?

• atom
• element
• molecule
• compound

Tags

NGSS.MS-PS1-1

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.

Tags

NGSS.MS-PS1-1

What is the picture displayed?

• atom
• element
• molecule
• compound

Tags

NGSS.HS-PS1-1

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

• atom
• mixture
• element
• compound

Tags

NGSS.MS-PS1-1

TRUE OR FALSE:
Every compound is a molecule but not every molecule is a compound.

• TRUE
• FALSE

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

• atoms
• elements
• molecules
• compounds