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General Chemistry Practice Quiz & Questions

Take a free practice quiz or point your phone at any General Chemistry exam question for an instant, explained answer — stoichiometry and bonding without the guesswork.

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General Chemistry questions often hinge on a specific calculation — balancing an equation, converting moles to grams, finding a limiting reactant — where one arithmetic or conceptual slip changes the final answer. Cambo reads the exact problem, including any structure or equation shown, and walks through the calculation step by step.

Test yourself with real practice questions.

An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?

  1. A17
  2. B18
  3. C34
  4. D35
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Answer
D35
35 — the mass number is the sum of protons and neutrons (17 + 18 = 35); electrons don't count toward mass number since their mass is negligible.

Which type of bond forms when electrons are transferred from one atom to another, such as between sodium and chlorine?

  1. ACovalent bond
  2. BIonic bond
  3. CMetallic bond
  4. DHydrogen bond
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Answer
BIonic bond
An ionic bond — it forms through the transfer of one or more electrons from a metal (like sodium) to a nonmetal (like chlorine), creating oppositely charged ions that attract each other.

In the balanced equation 2H2 + O2 → 2H2O, how many moles of water are produced from 5 moles of O2, assuming excess H2?

  1. A5 moles
  2. B10 moles
  3. C2.5 moles
  4. D20 moles
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Answer
B10 moles
10 moles — the balanced equation shows a 1:2 mole ratio between O2 and H2O, so 5 moles of O2 produces 5 x 2 = 10 moles of water.

As you move left to right across a period on the periodic table, atomic radius generally:

  1. AIncreases, because more electron shells are added
  2. BDecreases, because increasing nuclear charge pulls electrons in the same shell closer
  3. CStays the same across a period
  4. DIncreases and then decreases unpredictably
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Answer
BDecreases, because increasing nuclear charge pulls electrons in the same shell closer
Atomic radius generally decreases across a period, because protons are added to the nucleus without adding a new electron shell, so the increasing positive charge pulls the existing electrons in more tightly.

A reaction combines 2 mol of A with 3 mol of B according to the equation A + 2B → C. Which reactant is the limiting reactant?

  1. AA, because it has fewer moles
  2. BB, because 2 mol of A would require 4 mol of B, but only 3 mol of B is available
  3. CNeither — they are both fully consumed
  4. DC, because it is the product
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Answer
BB, because 2 mol of A would require 4 mol of B, but only 3 mol of B is available
B is the limiting reactant — the equation requires 2 moles of B for every mole of A, so 2 mol of A needs 4 mol of B, but only 3 mol of B is on hand, meaning B runs out first.

What is the electron configuration notation for a neutral oxygen atom (atomic number 8)?

  1. A1s2 2s2 2p4
  2. B1s2 2s2 2p6
  3. C1s2 2s4 2p2
  4. D1s2 2p6
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Answer
A1s2 2s2 2p4
1s2 2s2 2p4 — with 8 total electrons, the first two fill the 1s orbital, the next two fill the 2s orbital, and the remaining four go into the 2p orbitals.
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Also known as.

Same course, different course code depending on your school.

Questions, answered.

What topics does General Chemistry I usually cover?

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Atomic structure and electron configuration, periodic trends, chemical bonding (ionic, covalent, and metallic), stoichiometry and balancing equations, states of matter, and an introduction to solutions and gas laws.

Does General Chemistry I usually include a lab component?

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Yes — most schools pair the lecture with a required lab section, often as its own 1-credit-hour course, since hands-on lab work is typically part of the science gen-ed requirement it fulfills.

Do I need a strong math background for General Chemistry?

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Basic algebra is generally sufficient for General Chemistry I — you'll do a lot of unit conversions and mole calculations, but calculus isn't usually required until later chemistry or physics coursework.

Is Cambo affiliated with McGraw Hill, Pearson, Cengage, or any university?

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No. Cambo is an independent study tool and isn't produced, endorsed, or affiliated with any textbook publisher or university.

Is General Chemistry I usually curved?

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It's common for large-lecture General Chemistry sections to curve exams, since problem-set-style tests can produce a wide spread of scores, but this varies by instructor and department.

How many credit hours is General Chemistry I usually worth?

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Typically 3-4 credit hours for lecture, often with an additional 1 credit hour for the paired lab section.

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