Chapter 11 Section Assessments
7. How do you write a word equation?
To write a word equation, write the names of the reactants separated by plus signs followed by an arrow, and followed by the names of the products separated by plus signs. 8. How do you write a skeleton equation?
To write a skeleton equation, write the formulas of the reactants to the left of the arrow and the formulas of the products to the right of the arrow. 9. Describe the steps in writing a balanced chemical equation. To write a balanced chemical equation, first write the skeleton equation for the reaction. Place the coefficients are needed to make the number of atoms of each element the same on the left of the arrow as on the right of the arrow. 10. Write skeleton equations for these reactions.
a. “Heating copper (II) sulfide in the presence of diatomic oxygen produces pure copper and sulfur dioxide gas” i. CuS + O2 Cu + SO2(g)
b. When heated, baking soda (sodium hydrogen carbonate) decomposes to form the products sodium carbonate, carbon dioxide, and water.” i. NaHCO3 Na2CO3 + CO2 + H2O
11. Write and balance equations for the following reactions. a. “Iron metal and chlorine gas react to form solid iron(III) chloride” i. 2FeCl3(s)
b. “Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas” i. Al2O3(s) + CO2(g)
c. “Solid magnesium reacts with aqueous silver nitrate to form solid silver and aqueous magnesium nitrate” i. 2Ag(s) + Mg(NO3)2(aq)
12. Balance the following equations.
a. 2SO2 + O2 -> 2SO3
b. Fe2O3 + 3H2 -> 2 Fe +3H2O
c. 4P + 5O2 -> P4O10
d. 2Al + N2 ->2AlN
22. What are the five types of chemical reactions?
They are combination, decomposition, single-replacement, double-replacement, and combustion. 23. What are the keys to predicting the products of the five general types of reactions? The key to predicting the products of the five general types of...
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