Chapter 2 Review

made of two or more atoms

• cell

• organelle

• chemicals

• molecules

Tags

NGSS.MS-PS1-1

Covalent bonds

• share electrons
• split electrons
• give/take electrons

How are ionic bonds formed?

• transfer of electrons from one atom to another
• two atoms bond together
• sharing electrons between atoms
• four atoms make a group together by bonding

Tags

NGSS.HS-PS1-3

What is a neutrons charge?

• positive

• negative

• has no charge

What is a protons charge?

• positive
• negative
• has no charge

What are valence electrons?

• the electrons in the outermost energy level
• the electrons in the innermost energy level

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom that has lost or gained electrons

• protons

• ion

• covalent bonds

• ionic bonds

Bases have a pH of

• 8

• <7

• 3

• >7

A pH of 7 is

• acidic

• neutral

• basic

A substance with a pH of 3 is:

• a base

• neutral

• an acid