LAW OF CONSERVATION OF MASS/MATTER

Master the Law of Conservation of Mass with this practice worksheet! Includes balancing, atom counting, and mass calculations.

Use the word bank to fill in the blanks in the statements below: The Law of Conservation of Mass states that during a chemical reaction, the mass of the products equals the mass of the reactants; mass cannot be created or destroyed.However, the Law of Conservation of Matter states that the number and kinds of atoms are the same in the reactants and products; matter cannot be created or destroyed. Parts of a chemical equation. Label the following diagram using the following terms: Product, Reactants, Subscript, Coefficient, and Yields.Please spell correctly and write EXACTLY how the words are written above. Reactants Product Subscript Yields Coefficient How many atoms of hydrogen and chlorine are in the following chemical formula?2HCl H =2Cl = 1 H =2Cl = 2 H =1Cl = 1 How many atoms of sodium, sulfur, and oxygen are in the following chemical reaction?2Na2SO4 Na = 2S = 1O = 4 Na = 4S = 2O = 4 Na = 4S = 2O = 8 Count the atoms in this chemical reaction. This equation is balanced:4Na + O2----->2Na2O True False maybe What coefficients are needed to balance the following chemical equation?_ Ca + _ O2 -------> _ CaO 1, 1, 2 2, 1, 1 2, 1, 2 According to the Law of Conservation of Mass, the mass of the reactants will always equal the mass of the products. Apply this law to the following chemical reaction. If 6.40 g of magnesium combines with 1.32 g of oxygen, how much magnesium oxide will be produced?2Mg + O2 -----> 2MgO6.40 g + 1.32 g yields ? 7.72 g 5.08 g 6.40 g Consider the following decomposition reaction: If 72 grams of water and 64 grams of oxygen are produced from the breaking down of H2O2 , what was the mass of the reactant?2 H2O2 --- > 2 H2O + O2 ? yields 72 g + 64 g 72 g 136 g 64 g If the mass of 191 grams NaCl reacted with 74 grams of calcium hydroxide and 80 grams of sodium hydroxide is produced, what mass of calcium chloride is produced?2 NaCl + Ca(OH)2 --- > CaCl2 + 2 NaOH 191 g + 74 yields ? + 80 52.5 grams 91 grams 185 grams Chemical Reaction Reactants Products Zn + S ---> ZnS Zn S ZnS 2Cu + O2 ---->2CuO Cu O CuO 2Mg + O2--->2MgO Mg O MgO N2 + 3H2---->2NH3 N H NH3 2Na + 2HCl--->H2 +2NaCl Na HCl NaCl H