Cla g 2 Na Br aq b What are the products 2 NaCl G Bra q c Check the equation if it conform with the Law of Conservation of Mas ccccc cline 2 4 lticolumn1c c Reactant side Element c Product side...

QUARTER 4 SCIENCE 10 (CHEIVISTRY) MODULE 3 CHEMICAL REACTION ENHANCEMENT ACTIVITY NAME qquad GRADE SECTION qquad SCORE qquad REACTIONS ON THE GO The law of conservation of mass is a scientific law popularized and systematized by the 18th-century French chemist Antoine Lavoisier According to this law matter cannot be created nor destroyed - it can only be changed This means that for substances undergoing chemical reaction its total mass before a chemical reaction takes place and after a chemical reaction had occurred are the same In balancing chemical reactions the number of atoms involved before and after the chemical reaction is conserved Simply the number of atoms are conserved As an example when the element sodium Ney4 combines with chlorine gas ft( Cl2 ) (s) it forms sodium chloride NaCl(s) The balanced chemical equation for this reaction is 2 Nai=1+ Cl2( ) arrow 2 NaCl(s) ccccc cline 2 - 4 lticolumn1c c Reactant side Element c Product side lticolumn1c 2 1 Na 1 2 2 2 Cl 1 2 The balanced equation shows that the total number of atoms in the reactants is equal to the total number of atoms in the products Directions A Identify the reactants and products of the reaction Check the Equation if the number of atoms on both sides are the same Use a separate sheet of paper for your answers 1 When aqueous sodium bromide reacts with chlorine gas it produces sodium chloride and bromine gas Cll (g) +2 NaBr iaq) arrow 2 NaCl(a q)+ Br2(g) a) What are the reactants in the equation above qquad b) What are the products qquad c) Check the equation if it conforms with the Law of Conservation of Mass

simplest whole number ratio In the equation below a coefficient 2 is placed before Fe2 O3 that makes 4 atoms of Fe atom and 6 atoms of O In the reactant side a coefficient 4 is placed before Fe atom and coefficient 3 is placed before O atoms that makes 4 atoms of Fe and 6 atoms of O underline4 Fe+underline3 O2 arrow underline2 Fe2 O3 ccccc cline 2 - 4 lticolumn1c c Reactant side Element c Product side lticolumn1c 4 1 Fe z 4 6 z O 3 6 4 Apply the Law of Conservation of Mass to get the same number of atoms of every element on each side of the equation The equation is now balanced They have the same number of atoms on both sides ACTIVITY 3 REACTION ON THE GO A Identify the reactants and products of the reaction Check the Equation if the number of atoms on both sides are the same 1 When aqueous sodium bromide reacts with chlorine gas it produces sodium chloride and bromine gas Cl2( g)+2 NaBr( qq) arrow 2 NaCl( aq)+ Br2( g) a) What are the reactants in the equation above b) What are the products c) Check the equation if it conforms with the Law of Conservation of Mass lllll cline 2 - 5 lticolumn1c c Reactant side Element c Product side

atoms on both sides are the same 1 When aqueous sodium bromide reacts with chlorine gas it produces sodium chloride and bromine gas C l2( g)+2 NaBr( aq) arrow 2 NaCl( aq)+ Br2( g) a) What are the reactants in the equation above qquad b) What are the products qquad c) Check the equation if it conforms with the Law of Conservation of Mass lllll cline 2 - 4 lticolumn1c c Reactant side Element c Product side lticolumn1c d) Is the reaction balanced Explain e) What is conservation of mass How does it relate to this exercise qquad 2 If the law of conservation of mass holds true how much sodium chloride will react with 340 g of silver nitrate to produce 17 g of sodium nitrate and 2870 g of silver chloride Write the letter of your answer A 1235 g B 1170 g C 932 g D 846 g

The law of conservation of mass is a scientific law popularized and systematized by the 18 th-century French chemist Antoine Lavoisier According to this law matter cannot be created nor destroyed-it can only be changed This means that for substances undergoing chemical reaction its total mass before a chemical reaction takes place and after a chemical reaction had occurred are the same 13 COQ4Science 10 Module 3 In balancing chemical reactions the number of atoms involved before and after the chemical reaction is conserved Simply the number of atoms are conserved As an example when the element sodium Na ( ) c combines with chlorine gas ft( Cl2 )( (t) it forms sodium chloride NaCl( s) The balanced chemical equation for this reaction is 2 Na(s)+ Cl( z) arrow 2 NaCl( s) ccccc cline 2 - 4 lticolumn1c c Reactant side Element c Product side lticolumn1c 2 1 Na 1 2 2 2 Cl 1 2 The balanced equation shows that the total number of atoms in the reactants is equal to the total number of atoms in the products Directions A Identify the reactants and products of the reaction Check the Equation if the number of atoms on both sides are the same Use a separate sheet of paper for your answers 1 When aqueous sodium bromide reacts with chlorine gas it produces sodium chloride and bromine gas Cl2( (s) +2 NaBr (aq) arrow 2 NaCl (ac) + Br2( (k) a) What are the reactants in the equation above qquad b) What are the products qquad c) Check the equation if it conforms with the Law of Conservation of Mass lcccc cline 2 - 4 lticolumn1c c Reactant side Element c Product side lticolumn1c