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CHEMICAL EQUATIONS Atoms Correct Mass Reactants balanced element Mg (cr) substance chemical reaction equation numbers two NAME _______________________________ PERIOD_______ DATE________ coefficients formula products yields A ______________ is a well-defined example of a chemical change. A chemical ___________ can be used to show the changes that occur in a chemical reaction. In a chemical equation, the substances on the left side of the arrow are the starting substances. These substances are called ______________. The substances on the right side of the arrow are the substances that result from the reaction. These substances are called ____________________. The arrow is read as either produces or ____________________. According to the law of conservation of _____________________, atoms are neither lost nor gained during a chemical reaction. This law is illustrated when a chemical equation is _______________________. When this is done, there will be the same number of ___________________ of each kind on both sides of the equation. In a chemical equation, the numbers that are placed in front of the symbols and the formulas are called ______________________. They are necessary to keep the _____________________ of atoms in balance. There are several rules for balancing an equation. First, write the correct ___________________ for each reactant and product. Next, choose the coefficients that make the number of atoms of each ___________________________ on each side of the equation equal. The correctly written formula should not be changed. If you change the formula of a substance, the equation is no longer _______________. Changing a formula will indicate a ___________________ different than the one intended. To balance the equation Mg(cr) + O2(g) MgO(cr), first choose coefficients to make the number of atoms of each element on each side of the equation equal. You would need to place a coefficient of _________________ in front of the product MgO(cr). You would also need to place a coefficient of two in front of the reactant _________________. Balance this first! 2 NaOH + H2SO4 Na2SO4 + H2O 1. List the elements in the equation _______________________________________________________. 2. Name the reactants _____________________________________. 3. Name the products _____________________________________. 4. Circle the subscripts. 5. Put a box around the coefficients. 6. How many oxygen atoms are on the left side of this equation? ____________How many are on the right?_______________ 7. State the law of conservation of mass ____________________________________________________________________________________________________ ____________________________________________________________________________________________________ 8. What information is in a chemical formula? _____________________________________________. 9. What does a subscript tell you? ________________________________________. 10. What information can be obtained from a chemical equation?________________________________________________. 11. What does a coefficient tell? __________________________________________________________. 12. What does the arrow () mean in a chemical reaction? _____________________________________.