LAW OF CONSERVATION OF MASS/MATTER

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 carbon and oxygen are in the following chemical formula?CO2 C = 1O =2 C = 2O =2 C = 1O =1 How many atoms of sodium, sulfur, and oxygen are in the following chemical formula?2Na2SO4 Na = 2S = 1O = 4 Na = 4S = 2O = 4 Na = 4S = 2O = 8 Balanced or unbalanced?2H2 + O2 ------>2 H2O balanced unbalanced Is this equation balanced or unbalanced? balanced unbalanced Count the atoms in this chemical reaction. This equation is balanced:4Na + O2----->2Na2O True False maybe The Coefficients in the following chemical reaction are (from left to right):3Fe + 4H2O------> 1Fe3O4+ 4H2 3, 4, 2, 4 3, 4, 1, 4 3, 4, 3, 4 How many atoms of hydrogen are in the following molecule?5H2 5 2 10 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 What coefficient is needed in front of the aluminum on the product side of this chemical reaction in order for it to follow the Law of Conservation of Matter? 2 Al2O3 ---- > _ Al + 3 O2 2 4 6 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 2KClO3 --- > 2 KCl + 3 O2 If 125 g of KClO3 is heated, what is the total mass of the products? 125 g 0 g -125 g Is the following chemical reaction balanced?2 Ca + 2 Cl2 -----> 2 CaCl yes no Hydrogen reacts with oxygen to produce hydrogen peroxide. How much hydrogen is used in the reaction?H2 + O2 ----> H2O2_ + 32 g yields 34 g 0 g 2 g 32 g 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