Atoms, Molecules, and Compounds

All matter is made of 

• energy 
• atoms 
• electrons 
• compounds 

Tags

NGSS.MS-PS1-1

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

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NGSS.MS-PS1-1

Molecules formed from different types of elements are called what?

• Atoms

• Electrons

• molecules

• Compounds

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

• a pure substance

• a compound

• a mixture

• a solution

These are pure substances made of only one kind of atom.

• Mixtures

• Compounds

• Nucleus

• Elements

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.

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?

• compound
• liquid
• element
• mixture

What part of the atom is responsible for determining an atom's chemical properties? 

• all electrons
• protons
• neutrons
• valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these items is made up of one or more molecules?

• Gold
• Hydrogen
• Salt 
• Neon 

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