ISBS, p. 50-52
13) See drawing.
14) Look at models.
a. Which models represent elements?
b. Which models represent compounds?
a. models i, ii, iv, and vi.
b. models iii and v.
15) What two pieces of information does a chemical formula provide?
A chemical formula provides each chemical substance (each element), and a subscript below each element representing how many atoms of each element is in one unit of the substance.
16) Name the elements and list the number of each atom indicated in the following substances:
a. phosphoric acid, H3PO4 (used in soft drinks)
b. sodium hydroxide, NaOH (found in some drain cleaners)
c. Sulfur dioxide, SO2 (an air pollutant)
a. Elements: Hydrogen, Phosphorus, and Oxygen. 3 Hydrogen atoms, 1 Phosphorus atoms, and 4 Oxygen atoms.
b. Elements: Sodium, Oxygen, Hydrogen. 1 Sodium atom, 1 Oxygen atom, and 1 Hydrogen atom.
c. Sulfur and Oxygen. 1 Sulfur atom and 2 Oxygen atoms.
17) See drawings.
18) Write chemical equations that represent the following word equations:
a. Baking soda (NaHCO3) reacts with hydrochloric acid (HCl) to produce sodium chloride, water, and carbon dioxide.
b. During respiration, one molecule of glucose, C6H12O6, combines with six molecules of oxygen gas to produce six molecules of carbon dioxide and six molecules of water.
a. NaHCO3 + Hcl → NaCl + H2O + CO2
b. C6H12O6 + O6 → 6 CO2 + 6 H2O
A chemical formula provides each chemical substance (each element)
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