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Quizzes > Quizzes for Business > Education

Take the Basic Chemistry Knowledge Quiz

Assess Fundamental Chemistry Concepts with Ease

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art displaying elements related to a Basic Chemistry Knowledge Quiz.

This 15-question basic chemistry quiz helps you review elements, compounds, and reactions so you can see what to study next. You can use it to check gaps before a class or exam. When you want more practice, try the longer practice test or the fundamentals quiz .

What is the chemical symbol for potassium?
Po
Pt
P
K
Potassium is represented by the symbol K, derived from its Latin name kalium. Other options represent different elements.
Which element has atomic number 8?
Oxygen
Carbon
Fluorine
Nitrogen
Atomic number 8 corresponds to oxygen, as the periodic table lists elements by increasing atomic number. Nitrogen is 7, fluorine is 9, and carbon is 6.
What is the chemical formula for water?
H2O
HO
OH2
H2O2
Water consists of two hydrogen atoms bonded to one oxygen atom, producing the formula H2O. H2O2 is hydrogen peroxide, and HO or OH2 are not standard formulas for water.
What is the pH of a neutral aqueous solution at 25°C?
0
1
14
7
A neutral aqueous solution at 25°C has a pH of 7 because [H+] equals 1-10❻❷ M. Values below 7 are acidic and above 7 are basic.
Which of the following is a halogen?
Fluorine
Sodium
Sulfur
Neon
Halogens occupy group 17 of the periodic table and include fluorine, chlorine, bromine, iodine, and astatine. Neon, sulfur, and sodium are not halogens.
Which element has the larger atomic radius?
Lithium
Neon
Cesium
Fluorine
As you move down a group in the periodic table, atomic radius increases due to the addition of electron shells; cesium is below lithium and thus larger. Neon and fluorine are in different groups and much smaller.
Which element is more electronegative?
Carbon
Hydrogen
Boron
Oxygen
Electronegativity increases across a period; oxygen is more electronegative than carbon, hydrogen, or boron. Oxygen has the highest value among the given options.
What is the correct chemical formula for calcium carbonate?
Ca2CO3
CaCO3
Ca(CO3)2
CaCO2
Calcium carbonate consists of one calcium ion and one carbonate ion, giving the formula CaCO3. Other formulas either double the carbonate group or misplace charges.
Which is the balanced reaction for the combustion of methane?
CH4 + O2 ' CO2 + H2O
CH4 + 2 O2 ' 2 CO + 2 H2O
CH4 + 2 O2 ' CO2 + 2 H2O
2 CH4 + 4 O2 ' 2 CO2 + 4 H2O
Balancing the combustion of methane requires two oxygen molecules to produce one carbon dioxide and two water molecules, giving CH4 + 2 O2 ' CO2 + 2 H2O. Other options either lack correct stoichiometric coefficients or incorrect products.
How many grams of CO2 are produced from 2.0 moles of CO2?
88 g
110 g
22 g
44 g
The molar mass of CO2 is 44 g/mol, so multiplying 2.0 mol - 44 g/mol gives 88 g. The other values do not match this calculation.
Which of the following is a strong base?
CH3COOH
HCl
NaOH
NH3
NaOH dissociates completely in water, producing hydroxide ions, which classifies it as a strong base. Ammonia only partially accepts protons and is considered a weak base.
What type of reaction is HCl + NaOH ' NaCl + H2O?
Neutralization
Decomposition
Redox
Synthesis
A neutralization reaction occurs when an acid and a base react to form a salt and water. HCl (acid) reacting with NaOH (base) to produce NaCl and H2O is a classic example.
According to 2 H2 + O2 ' 2 H2O, how many moles of H2O are produced from 3 moles of O2?
2 moles
6 moles
1 mole
3 moles
According to 2 H2 + O2 ' 2 H2O, one mole of O2 produces two moles of H2O. Therefore, 3 moles of O2 produce 6 moles of H2O.
Which compound is amphoteric?
Al(OH)3
NaCl
CO2
ZnO
An amphoteric compound can act as both an acid and a base; Al(OH)3 dissolves in acids and bases. ZnO is basic, NaCl is neutral, and CO2 is acidic when dissolved in water.
Which species acts as a Brønsted-Lowry acid in water?
OH'
HCl
Cl'
NH3
A Brønsted-Lowry acid is a proton donor; HCl donates H+ ions in water. NH3 acts as a base by accepting protons, and OH' is a base species.
What is the pH of a 0.01 M NaOH solution?
12
7
2
14
A 0.01 M NaOH solution has [OH'] = 0.01 M, so pOH = 2 and pH = 14 ' 2 = 12. The solution is basic.
What volume of 0.1 M NaOH is required to neutralize 25 mL of 0.1 M H2SO4?
12.5 mL
25 mL
50 mL
100 mL
Each mole of H2SO4 requires two moles of NaOH, so 0.025 L - 0.1 M = 0.0025 mol H2SO4 needs 0.005 mol NaOH. At 0.1 M, that requires 0.005 L (50 mL) of NaOH solution.
In the redox reaction Cl2 + 2 Br' ' 2 Cl' + Br2, which is the oxidizing agent?
Br'
Cl2
Br2
Cl'
The oxidizing agent is the species that is reduced by gaining electrons; Cl2 gains electrons and is reduced to Cl'. Therefore, Cl2 is the oxidizing agent during the reaction.
Given 10.0 g H2 reacts with 40.0 g O2 to form H2O, which is the limiting reagent?
H2
O2
Neither
H2O
Available moles: H2 = 10.0 g / 2.02 g/mol ≈ 4.95 mol; O2 = 40.0 g / 32.00 g/mol = 1.25 mol. The reaction requires two moles of H2 per mole of O2, so O2 is the limiting reagent.
Which element in period 2 has the highest first ionization energy?
B
N
Be
Li
First ionization energy generally increases across a period due to increasing nuclear charge. In period 2, nitrogen has the highest first ionization energy among the given elements.
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Learning Outcomes

  1. Analyse element properties and periodic table trends.
  2. Identify chemical symbols, formulas, and common compounds.
  3. Apply stoichiometric calculations to simple reactions.
  4. Demonstrate understanding of acids, bases, and pH concepts.
  5. Evaluate reaction types and balance basic chemical equations.

Cheat Sheet

  1. Periodic Table Trends - Think of the periodic table as a colorful playground where each element has its own personality. Trends like atomic radius, electronegativity, and ionization energy let you predict how elements will behave in reactions. Watch the radius shrink across a period and grow down a group to become a trend-spotting pro. Dive deeper into periodic trends
  2. Chemical Symbols & Formulas - Master the language of chemists by getting cozy with chemical symbols and formulas. Recognizing H₂O, CO₂, or C₆H₝₂O₆ at a glance transforms messy names into tidy codes. Once you crack the formula, you can decode composition and predict reaction partners. Explore chemical formulas
  3. Common Compounds & Uses - Explore chemistry in your kitchen and beyond by learning common compounds and their uses. From NaCl sprinkling on your fries to H₂SO₄ powering car batteries, each molecule tells a real-world story. This knowledge connects abstract formulas to everyday life. Discover common compounds
  4. Stoichiometric Calculations - Grab your calculator and dive into stoichiometry to determine exactly how much reactant you need and product you'll get. For example, balancing 2H₂ + O₂ → 2H₂O helps you figure out how many grams of water you can produce. It's like a recipe but for molecules! Practice stoichiometry
  5. Mole Concept & Avogadro's Number - Meet the mole, chemistry's counting unit that uses Avogadro's number (6.022 × 10²³) to tally atoms and molecules. With this supercharged number, you can convert between particles and grams like a pro. It's the secret sauce behind accurate reaction calculations. Understand the mole
  6. Acids & Bases - Dive into the world of acids and bases and discover what makes your stomach juice pH around 1 and soap feel slippery. The pH scale (0 - 14) tells you who's punching with protons (acids) and who's grabbing them (bases). Spot how lemon juice brightens salads at pH 2! Learn about pH and acids/bases
  7. Types of Chemical Reactions - Become a reaction detective by identifying synthesis, decomposition, single and double replacement, and combustion. Each type has its own pattern and clues to predict products before you even mix chemicals. Think of it as chemistry's version of genre tropes! Identify reaction types
  8. Balancing Chemical Equations - Balance chemical equations like a pro to obey the law of conservation of mass - no atoms lost or gained. For instance, tweak 2H₂ + O₂ → 2H₂O until hydrogen and oxygen totals align on both sides. It's the molecular version of a seesaw that always needs equilibrium. Master equation balancing
  9. Role of Catalysts - Unleash the power of catalysts to speed up reactions without wearing themselves out. Enzymes in our bodies are superstar catalysts that make digestion possible in seconds. Industrial catalysts help produce everything from fuels to plastics faster and cleaner. Explore catalysts
  10. Laboratory Safety Procedures - Suit up for success by mastering lab safety procedures: goggles on, gloves up, and always check the MSDS before handling chemicals. Knowing safety symbols and proper waste disposal keeps experiments fun and incident-free. Safety is your best lab partner! Review lab safety
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