C1 8.5A, B, D Atomic Structure & Chemical Formulas

Oxygen and oxygen-containing compounds are involved in many different reactions. Which balanced equation represents a reaction that involves 14 atoms of oxygen?

• NH₄Cl + KOH → NH₃ + H₂O + KCl

• 2Na + 2H₂O → 2NaOH + H₂

• 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

• 4Fe + 3O₂ → 2Fe₂O₃

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The names and chemical formulas for four substances are shown in the chart. Which substance listed in the chart is made up of the most atoms?

• Carbonic acid

• Nitric acid

• Phosphoric acid

• Sulfuric acid

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How many atoms of oxygen are in a molecule of glucose (C₆H₁₂O₆)?

(a)  

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How many atoms in all are in a molecule of serotonin?

(a)  

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How many atoms of each element are in one molecule of 2-heptanone?

• 4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

• 6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

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An atom would become a different element if which characteristic changed?

• The number of protons

• The number of neutrons

• The number of energy levels

• The number of valence electrons

A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?

• Oxygen, O, and neon, Ne

• Fluorine, F, and neon, Ne

• Silicon, Si, and phosphorus, P

• Beryllium, Be, and boron, B

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The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is sodium, and it is highly reactive.

• The element is fluorine, and it is not very reactive.

• The element is sodium, and it is not very reactive.

• The element is fluorine, and it is highly reactive.

Which table correctly identifies the charges of subatomic particles?

• 
• 
• 
• 

Which of these statements about the mass of subatomic particles is true?

• The mass of a proton is the same as the mass of an electron.

• The mass of a neutron is the same as the mass of an electron.

• The mass of a neutron is much greater than the mass of a proton.

• The mass of a proton is much greater than the mass of an electron.