Chemical Reaction Equations

What does the Law of Conservation of Mass state?

• No new substances can be made or destroyed

• No new compounds can be made or destroyed

• No new atoms can be made or destroyed

• Mass cannot be lost from a physical reaction

In a chemical reaction, ________________________ are changed into _______________________.

• Reactants; Products

• Electrons; Molecules/Compounds

• Coefficients; Subscripts

• Original Elements; New Elements

Which type of reaction pulls in thermal energy from the environment around it?

• Endothermic

• Exothermic

Description of a reaction using element symbols and chemical formulas.

• chemical equation

• chemical bond

• chemical reaction

• chemical balance

States that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.

• law of conservation of mass

• law of superposition

• law of gravity

• law of conservation of energy

Chemical reaction in which a substance combines with oxygen and releases energy, carbon dioxide and water.

• combustion

• decomposition

• synthesis

• product

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

• decomposition

• double replacement

• single replacement

• synthesis

Describes a reaction in which the negative ions in two compounds switch places, forming two new compounds.

• combustion

• decomposition

• double displacement

• single displacement

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

• synthesis

• single replacement

• double replacement

• combustion

Chemical reactions that release thermal energy.

• endothermic

• exothermic