Chemistry Final Review

What is the law of conservation of mass?

• Mass is neither created nor destroyed in a chemical reaction.

• Mass can be created but not destroyed in a chemical reaction.

• Mass is only conserved in physical changes, not chemical reactions.

• Mass can be destroyed but not created in a chemical reaction.

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How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?

• 8.4 mol

• 10.1 mol

• 12.5 mol

• 9.0 mol

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What is the balanced equation for the decomposition of potassium chlorate (KClO3)?

• 2 KClO3 → KCl + 3 O2

• 2 KClO3 → 2 KCl + 2 O2

• 2 KClO3 → 2 KCl + 3 O2

• KClO3 → KCl + O2

What is the molar mass of water (H2O)?

• 16 g/mol

• 18 g/mol

• 20 g/mol

• 22 g/mol

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What is the difference between an ionic bond and a covalent bond?

• Ionic bonds involve the sharing of electrons, while covalent bonds involve the transfer of electrons.

• Ionic bonds are formed between two nonmetals, while covalent bonds are formed between a metal and a nonmetal.

• Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

• Ionic bonds are weaker than covalent bonds and are formed in gases.

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What is the formula for calculating moles from mass?

• Moles = Mass (g) / Molar Mass (g/mol)

• Moles = Mass (g) x Molar Mass (g/mol)

• Moles = Molar Mass (g/mol) / Mass (g)

• Moles = Mass (g) + Molar Mass (g/mol)

What does pH measure?

• The amount of hydrogen (H+) ions

• The amount of oxygen (O2) ions

• The acidity of a solution

• The temperature of a solution

What is the pH scale range?

• 0 to 10, with 5 being neutral.

• 0 to 14, with 7 being neutral.

• 1 to 14, with 7 being acidic.

• 0 to 20, with 10 being neutral.

What is the balanced equation for the reaction of nitrogen and hydrogen to form ammonia?

• N2 + 2 H2 → NH3

• N2 + 3 H2 → 2 NH3

• N2 + H2 → NH3

• N2 + 4 H2 → 2 NH3

What is the significance of the periodic table?

• It organizes elements based on their atomic number and properties, helping predict chemical behavior.

• It lists all known elements in alphabetical order.

• It provides a visual representation of chemical reactions.

• It categorizes elements based on their color and size.

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