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Socrative Quiz CHEMICAL REACTIONS #1 1. The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. True False 2. In order to show that mass is conserved during a reaction, a chemical equation must be balanced. True False 3. Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure the amount of substance. True False 4. What is the law of conservation of mass? 5. Why does chemical equation need to be balanced? 6. Why do chemists use the mole as a counting unit? 7. What information do you need to predict the mass of a reactant or product in a chemical reaction? 8. The following equation describes how sodium and chlorine react to produce sodium chloride. Is the equation balanced? 2Na +Cl2 2 NaCl True False 9. Balance the following equation K + Br2 KBr 10. Balance the following equation H2 + O2 H2O