Chemical Reactions and Chemical Equations

Chemical reaction in which a substance combines with oxygen and releases energy.

• combustion

• decomposition

• synthesis

• product

Chemical reaction in which one compound breaks down and forms two or more substances.

• decomposition

• double replacement

• single replacement

• synthesis

Chemical reaction in which two or more substances combine and form one compound.

• synthesis

• single replacement

• double replacement

• combustion

Tags

NGSS.MS-PS1-5

Minimum amount of energy needed to start a chemical reaction.

• activation energy

• catalyst

• inhibitor

• enzyme

Tags

NGSS.HS-PS1-4

Chemical reactions that absorb thermal energy.

• endothermic

• exothermic

Tags

NGSS.MS-PS1-6

Chemical reactions that release thermal energy.

• endothermic

• exothermic

Substance that slows down, or even stops, a chemical reaction.

• inhibitor

• catalyst

• enzyme

• activation energy

What happens in a chemical reaction?

• Bonds between atoms break and/or are formed

• New atoms are created and/or removed

• Protons move from one atom to another

• Electrons change into protons

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following would indicate that a chemical reaction has occurred?

• A new element has been created

• A different substance has formed

• The total mass has either increased OR decreased

• The total number of elements has either increased OR decreased

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which would indicate a chemical equation is balanced?

• If the number of atoms in the reactants is the same as the number of atoms in the products

• If the atoms have ionic OR covalent bonds

• If the atoms have full valence shells

• If the total energy has remained the same

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5