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Quizzes > Quizzes for Business > Education

Chemistry Final Exam Quiz Practice

Test Your Chemistry Knowledge with this Quiz

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting elements related to a Chemistry Final Exam Quiz

Ready to challenge yourself with a comprehensive chemistry final exam quiz? Joanna Weib invites students preparing for their chemistry final exam to dive into core concepts and test their knowledge with carefully crafted questions on stoichiometry, thermodynamics, and reaction mechanisms. This free practice quiz complements resources like the Chemistry Fundamentals Quiz and Chemistry Knowledge Assessment Quiz to reinforce learning. After taking this quiz, personalize your path by exploring other quizzes or tweaking questions in our editor to match your study needs. Let's boost your confidence for the final exam together!

What is the balanced form of the reaction between hydrogen gas and oxygen gas to form water?
2 H2 + O2 -> 2 H2O
H2 + O2 -> H2O
2 H2 + 2 O2 -> 2 H2O
2 H2 + O2 -> H2O
Balancing requires two H2 molecules and one O2 molecule to form two H2O molecules. This ensures conservation of both hydrogen and oxygen atoms.
Given the reaction 2H2 + O2 -> 2H2O has a ΔH of -572 kJ, what is the ΔH for the reaction H2 + 1/2 O2 -> H2O?
-286 kJ
-572 kJ
+286 kJ
+572 kJ
The target reaction is exactly half of the given reaction, so the enthalpy change is half of -572 kJ. Therefore, ΔH = -286 kJ.
Which change will generally increase the rate of a reaction between two gases?
Increase the temperature
Decrease the reactant concentration
Add a reaction inhibitor
Lower the surface area of any solids
Raising the temperature increases molecular kinetic energy and collision frequency. This generally leads to a higher reaction rate.
What is the pH of a 0.01 M HCl solution?
2
1
12
7
HCl is a strong acid and dissociates completely, giving [H+] = 0.01 M. Taking pH = -log[H+] yields pH = 2.
What is the molecular geometry of CH4 according to VSEPR theory?
Tetrahedral
Linear
Trigonal planar
Bent
Carbon in CH4 has four bonding pairs and no lone pairs, leading to a tetrahedral arrangement. This geometry minimizes electron-pair repulsion.
What is the coefficient of O2 when the combustion of propane is balanced: C3H8 + O2 -> CO2 + H2O?
5
3
4
6
Balanced combustion of C3H8 yields C3H8 + 5 O2 -> 3 CO2 + 4 H2O. Oxygen coefficient must be 5 to conserve C, H, and O atoms.
Using Hess's law, if A -> B has ΔH = +150 kJ and B -> C has ΔH = -200 kJ, what is ΔH for A -> C?
-50 kJ
+350 kJ
+50 kJ
-350 kJ
Hess's law states ΔH for A -> C is the sum of the steps: +150 kJ + (-200 kJ) = -50 kJ.
For the rate law rate = k[A]^2[B], if [A] doubles and [B] remains constant, by what factor does the rate change?
4
2
8
1
Doubling [A] in a second-order term gives (2)^2 = 4, so the reaction rate quadruples when [A] is doubled.
What is the approximate pH of a 0.10 M acetic acid solution (Ka = 1.8×10^-5)?
2.87
1.87
3.72
5.00
For a weak acid, [H+] ≈ √(Ka·Ca) = √(1.8×10^-5·0.10) ≈ 1.34×10^-3, giving pH ≈ 2.87.
Which of the following mixtures acts as a buffer solution?
Acetic acid and sodium acetate
HCl and NaCl
CH3COOH and NaOH
NaCl and KCl
A buffer requires a weak acid and its conjugate base. Acetic acid paired with sodium acetate resists pH changes.
Which element has the largest atomic radius?
Na
Mg
Al
P
Atomic radius increases down a group and decreases across a period. Sodium (Na) is the leftmost and largest in the given set.
What is the hybridization of the carbon atoms in ethene (C2H4)?
sp2
sp3
sp
sp3d
Each carbon in C2H4 is bonded to three regions of electron density (two C - H bonds and one C=C bond). That corresponds to sp2 hybridization.
For which reaction order is a plot of ln[A] versus time linear?
First order
Zero order
Second order
Third order
First-order kinetics follow the form ln[A] = -kt + ln[A]₀, giving a straight line when ln[A] is plotted vs. time.
Which of the following 0.1 M solutions is acidic?
NH4Cl
NaCl
CH3COONa
KOH
NH4+ is the conjugate acid of NH3 and releases H+ in water, making the solution acidic. The others are neutral or basic salts.
What is the molecular geometry of SO2?
Bent
Linear
Trigonal planar
Tetrahedral
SO2 has three electron domains (two bonding and one lone pair) around sulfur, giving a bent molecular shape by VSEPR theory.
Given 15.0 g of Al and 50.0 g of Cl2 react via 2Al + 3Cl2 -> 2AlCl3, which is the limiting reagent?
Cl2
Al
AlCl3
Neither; they react in exact stoichiometric ratio
Moles Al = 15.0/26.98 ≈ 0.556, moles Cl2 = 50.0/70.90 ≈ 0.705. Reaction needs 3/2·0.556 ≈ 0.834 mol Cl2, so Cl2 is limiting.
Using bond energies (H - H = 436 kJ/mol, F - F = 158 kJ/mol, H - F = 565 kJ/mol), what is ΔH for H2 + F2 -> 2 HF?
-536 kJ
-630 kJ
+536 kJ
+322 kJ
ΔH = bonds broken (436 + 158) - bonds formed (2×565) = 594 - 1130 = -536 kJ. Negative sign indicates exothermic reaction.
For a first-order reaction with k = 0.025 s^-1, how long does it take for [A] to drop to 10% of its initial value?
92 s
46 s
230 s
10 s
Use t = ln(0.10)/(-k) = 2.3026/0.025 ≈ 92 s. First-order kinetics give this logarithmic relationship.
What is the bond order of O2 and is it paramagnetic or diamagnetic?
Bond order 2 and paramagnetic
Bond order 2 and diamagnetic
Bond order 1 and paramagnetic
Bond order 3 and diamagnetic
O2 has 12 valence electrons in its MO diagram, giving a bond order of (8 bonding - 4 antibonding)/2 = 2. Two unpaired electrons make it paramagnetic.
What is the molecular geometry of SF4 according to VSEPR theory?
Seesaw
Trigonal bipyramidal
T-shaped
Square planar
SF4 has five electron domains (four bonding and one lone pair). One lone pair distorts the shape to a seesaw geometry.
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Learning Outcomes

  1. Apply stoichiometry principles to balance complex chemical equations.
  2. Analyse thermochemical data to calculate enthalpy changes.
  3. Evaluate reaction rates and factors affecting chemical kinetics.
  4. Identify acid-base equilibria and predict pH of solutions.
  5. Master electronic structure and periodic trends of elements.
  6. Demonstrate understanding of chemical bonding and molecular geometry.

Cheat Sheet

  1. Balance Chemical Equations - Keep your atom count happy on both sides by adjusting coefficients, never subscripts. Start with the trickiest molecules first and check each element one by one. For example, H₂ + O₂ → H₂O becomes 2H₂ + O₂ → 2H₂O to balance all atoms perfectly. Save My Exams
  2. Stoichiometry - Treat balanced equations like recipes: use molar ratios to convert between moles, mass, and volume. If 2H₂ + O₂ → 2H₂O, one mole of H₂ yields one mole of H₂O, so scale your "ingredients" to predict yields or required reactant amounts. This skill is vital for cooking up just the right quantities in lab reactions. Wikipedia
  3. Enthalpy and Heat Changes - Enthalpy (ΔH) tells you whether a reaction is a heat party or an energy vampire. Exothermic reactions (ΔH < 0) release heat and feel warm, while endothermic ones (ΔH > 0) absorb heat and feel cool. Spotting these patterns helps you predict how a reaction will affect temperature. ChemStem
  4. Hess's Law - Break complex reactions into smaller steps and add their ΔH values like scoring points in a game. The total enthalpy change is just the sum of the parts, letting you calculate ΔH for reactions that are hard to measure directly. It's a reliable thermodynamic cheat sheet for tricky reactions. ChemStem
  5. Reaction Rates - Reaction speed depends on collisions: increase temperature or concentration for more frequent, energetic crashes. Surface area and catalysts also spice up the action, making reactant molecules collide faster. Mastering these factors lets you control how quickly chemistry unfolds. ChemStem
  6. Activation Energy & Catalysts - Activation energy is the hill reactant molecules must climb to transform into products. Catalysts lower that hill without being consumed, speeding up reactions - enzymes in your body are prime examples, tirelessly catalyzing life's essential chemistry. ChemStem
  7. Acid-Base Equilibria - Predict the pH playground by knowing which acids and bases dissociate fully or partially. Strong acids like HCl go all-in, dropping pH quickly, while weak acids hold back some protons. These insights help you design buffer solutions and control acidity. ChemStem
  8. Periodic Trends - Spot trends like atomic radius shrinking across a period or electronegativity rising, and you'll unlock why elements behave the way they do. These patterns help predict reactivity, bond types, and other quirks of the periodic table. StudyLib
  9. Molecular Geometry (VSEPR) - Use VSEPR theory to predict molecule shapes by treating electron pairs as dance partners that repel each other. From tetrahedral methane (CH₄) to bent water (H₂O), these 3D shapes explain molecular properties and reactivity. StudyLib
  10. Practice & Application - The best way to ace chemistry is by doing chemistry! Work through diverse problems, lab scenarios, and real-world examples to solidify concepts. Consistent practice boosts confidence and helps you apply theory to practical situations. ChemStem
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