Homework - Week 14 1. What is stated in the Law of Conservation of Mass? 2. What changes during a chemical reaction? What cannot change? 3. Consider the following chemical reaction: Na, CO, (s) + 2 HCI (aq) - H,O (1) + CO2 (g) + 2 NaCl (aq) a. What are the reactants? b. What are the products? c. Classify each substance by their state of matter: i. Solid - ii. Liquid - iii. Gas - iV. Aqueous solution - d. How many molecules of HCI participate in the reaction? 4. Why must a chemical equation be balanced? 5. Balance the following equations. Use reduced, whole number coefficients. If the coefficient is a 'l', you may write the number or leave it blank