24 Jun Atoms are neither created nor destroyed when chemical reactions occur. Two balanced chemical reactions are given below. In a chemical reaction eq
Atoms are Atoms are neither created nor destroyed when chemical reactions occur. Two balanced chemical reactions are given below. In a chemical reaction eqneither created nor destroyed when chemical reactions occur. Two balanced chemical reactions are given below. In a chemical reaction equation, reactant atoms are shown on the left side of the arrow and product atoms are shown on the right. (A) 2 H2 + O2 2 H2O (B) Fe2O3 + 2 Al 2 Fe + Al2O3 1. Consider the reactions above. What are the reactants? 2. What are the products? 3. What does the arrow represent in a chemical reaction? 4. How many H atoms are represented on the reactant side of reaction (A)? 5. How many H atoms are represented on the product side of reaction (A)? 6. Compare the number of atoms of each element on the reactant and product sides of equations above. Are the numbers the same or different? 7. For each H2 molecule consumed in reaction (A), how many H2O molecules are produced? 8. Equation: PCl5 + H2O H3PO4 + HCl In the reaction above, identify the atoms that are not equal in number on the reactant and product side. 9. In the above reaction, what would you do to make all the atoms balanced on the reactant and product side? 10. Balance the following reactions. (You may just give the coefficients in front of the formulas instead writing the entire equation.) Al(OH)3(s)–> Al2O3(s) + H2O(g) 11. Fe2S3(s) Fe(s) + S(s) 12. Na2CO3(aq) + BaCl2(aq) BaCO3(s) + NaCl(aq) 13. Al(s) + NiNO3(aq) Al(NO3)3 + Ni(s) 14. H2(g) + Cl2(g) HCl(g) 15. C3H8 + O2 CO2 + H2O
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