Unit 8: Introduction to Chemical Reactions

Which part of a chemical equation lists the substances present before the reaction occurs?

In the equation 2H2 + O2 → 2H2O, what does the arrow represent?

Which statement best describes the law of conservation of mass in chemical reactions?

Which set of coefficients correctly balances: ___ Al + ___ O2 → ___ Al2O3?

Balancing equations is done by adjusting which numbers?

Which reaction type forms one product from two or more reactants?

Identify the reaction type: 2KClO3 → 2KCl + 3O2.

Which choice shows evidence that a chemical change occurred?

Which equation is correctly balanced for the combustion of methane: CH4 + ___ O2 → ___ CO2 + ___ H2O?

Which reaction type involves exchange of ions between two compounds, often forming a precipitate?