Law of Conservation of Mass 2024

Master the Law of Conservation of Mass with this 9th-grade chemistry worksheet!

Label the following diagram using the following terms:Products, Reactants, Subscript, Coefficient, and Yields. Please spell correctly and write EXACTLY how the words are written above. Reactants Products Subscript Yields Coefficient According to the law of conservation of mass, which of the following is a true statement about any chemical reaction? The total mass of the reactants is greater than the total mass of the products. The total mass of the reactants is less than the total mass of the products. The total mass of the reactants equals the total mass of the products. In a chemical reaction, matter can be destroyed but not created. Which is always true of a balanced chemical equation? Coefficients on both sides of the equation are multiples of 2. The subscripts on one side of the equation are the same as the subscripts on the other side. The number of molecules is the same on both sides of the equation. Both sides of the equation contain the same elements and the same number of atoms. Law of Conservation of Mass Chemical Equations Read the text on the Law of Conservation of Mass to help answer the following questions. Law of Conservation of Mass Understanding Chemical Equations 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 hydrogen are in the following molecule?6H2 2 6 8 12 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 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 52 g 64 g 72g 136 g Count the atoms in this chemical reaction. Is this equation balanced? Yes No Maybe???? How many bromine (Br) atoms do you need to balance this chemical equation? 1 2 3 4 How many silver (Ag) atoms would you need for this chemical equation to be balanced? 1 2 3 4 How many Sulfur and Oxygen atoms would you need for this equation to be balanced? S= 8O = 6 S= 8O = 12 S= 8O = 21 S= 8O =24 If 125 g of KClO3 is heated, what is the total mass of the products?2KClO3 --- > 2 KCl + 3 O2 225 g 50 g 75 g 125 g If a chemical reaction, such as the burning of natural gas, starts with 4 atoms of hydrogen, how many atoms of hydrogen should be in the products? 1 atom of hydrogen 2 atoms of hydrogen 4 atoms of hydrogen 8 atoms of hydrogen Use the word bank to fill in the blanks in the statements below: According to the Law of Conservation of Matter during a chemical reaction, the mass of the products equals the mass of the reactants; because mass cannot be created or destroyed. Because of this law, you will also find that when writing a chemical equation, the number and kinds of atoms are the same in the reactants and products. Use the word bank to fill in the blanks in the statements below: This Law was discovered by Antoine Lavoisier after repeated experiments during the 18th century. In order to observe this law, he had to create a "closed system", in which nothing enters or exits. This allowed him to observe that atoms are never lost or gained, but instead rearranged to form new chemical bonds and substances. If the chemical reaction does not occur in a "closed system", then atoms have the ability to escape into the atmosphere, giving the illusion that they have "disappeared". This can make the mass of the products seem less than the reactants. Word Search To mark a word click its first letter then click its last. CONSERVATION CLOSEDSYSTEM EQUIVALENT SUBSCRIPT REARRANGE MOLECULE REACTANT FORMULA PRODUCT MATTER YIELDS ATOMS