Atoms, Elements & 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

The chemical combination of two or more different kinds of atoms in fixed amounts is called a(n)

• orbit
• compound
• mixture
• element

Tags

NGSS.MS-PS1-1

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

Tags

NGSS.MS-PS1-1

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

What defines a mixture?

• described by a chemical formula
• can be broken down into its basic substances through physical means
• created through a chemical reaction
• cannot be broken down into simpler substances

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

Where are protons and neutrons located? 

• in the nucleus
• in the electron cloud
• in the valence shell

What is the charge on a proton? 

• positive
• neutral
• negative

What is the charge of an electron? 

• positive
• neutral
• negative

Tags

NGSS.MS-PS2-3

H₂O is most accurately described as a ___________________.

• molecule

• compound

• element

• atom

Tags

NGSS.MS-PS1-1