Online MCAT Chemistry Tutor for Chem/Phys

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The Learning Process with Dr Uma Sharma

Repair weak chemistry foundations before moving into timed MCAT chemistry passages.
Highly interactive sessions customized to your needs.
All sessions recorded for review on any device.
Quizzes, homework and timed drills aligned to MCAT chemistry skills within Chem/Phys.

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About MCAT Chemistry

The MCAT Chemical and Physical Foundations of Biological Systems section is broad, but this page focuses specifically on the chemistry topics within that section. Students must read passages quickly, extract useful data, identify the chemistry concept being tested, apply General Chemistry, Organic Chemistry or chemistry-linked Biochemistry, and solve accurately under time pressure — without a calculator.

Many students study General Chemistry and Organic Chemistry for months but still struggle because MCAT chemistry questions are passage-based. The difficulty is not only “Do I know the formula?” but “Can I recognise when to use it, estimate quickly, use units correctly, and avoid answer traps?”

Biggest Challenges Faced in MCAT Chemistry Questions

Weak foundations: old gaps in mole concept, bonding, acids and bases, equilibrium, thermodynamics, kinetics and electrochemistry slow down passage solving.
No-calculator pressure: students must estimate, use scientific notation, handle units and simplify numbers quickly.
Passage overload: students may get lost in long experimental passages instead of identifying what is actually being tested.
Mixed-topic reasoning: one passage may combine General Chemistry, Organic Chemistry, chemistry-linked Biochemistry, graphs and experimental data.
Organic Chemistry application: stereochemistry, functional groups, separations, spectroscopy and reaction logic often appear in applied contexts.
Timing and stamina: 59 questions in 95 minutes require controlled pacing and quick decision-making.
Error patterns: repeated mistakes in units, signs, approximations, equation choice and answer elimination can hold back the score.

How Dr Uma Sharma Helps Students Improve

Diagnostic start: weak areas are identified before creating the study plan.
Concept repair: high-yield General Chemistry, Organic Chemistry and chemistry-linked Biochemistry foundations are rebuilt clearly.
Passage modelling: students learn how to read MCAT passages without getting overwhelmed.
No-calculator chemistry math: dimensional analysis, units, scientific notation and estimation are practised regularly.
Timed drills: practice gradually shifts from concept questions to timed passage and discrete sets.
Error-log review: track mistakes and recycle.
Recordings, quizzes and homework: learning continues after class through review and structured practice.

Section Format

Section: Chemical and Physical Foundations of Biological Systems

Scope of tutoring: General Chemistry, Organic Chemistry and chemistry-linked Biochemistry

Length: 95 minutes

Questions: 59 total — passage-based and discrete questions

Calculator: Not allowed

Skills Built in Class

General Chemistry and Organic Chemistry foundations
Chemistry-linked Biochemistry relevant to Chem/Phys passages
Data, graphs and experimental reasoning in chemistry passages
Equation choice and unit handling for chemistry problems
No-calculator chemistry estimation
Timed passage strategy and review

MCAT Chemistry Questions Answered

What makes the MCAT Chem/Phys chemistry questions difficult?

The chemistry questions in the MCAT Chem/Phys section are difficult because they do not test chemistry as isolated textbook chapters. Students must read passages, extract useful information, interpret graphs and tables, apply General Chemistry, Organic Chemistry and chemistry-linked Biochemistry, and solve under strict time pressure without a calculator. Chemtopper tutoring for this page is focused on chemistry topics only, not full Physics, Biology, CARS or Psychology/Sociology preparation.

Why do students lose marks even after studying chemistry?

Many students know the content but lose marks because they cannot quickly identify what the passage is testing, choose the right equation, handle units, estimate without a calculator, or connect chemistry with biological context. MCAT preparation requires content knowledge plus passage strategy.

What chemistry topics are covered for MCAT Chem/Phys?

Chemtopper focuses on the chemistry topics tested within the Chemical and Physical Foundations section: General Chemistry, Organic Chemistry, chemistry-linked Biochemistry, no-calculator chemistry math, units, graphs, experimental reasoning and passage-based problem solving.

How many questions are there in MCAT Chem/Phys?

The full MCAT Chem/Phys section has 59 questions in 95 minutes. Chemtopper’s support on this page is for the chemistry part of this section, so students work on chemistry passage reasoning, discrete chemistry questions, no-calculator chemistry math, timing and error analysis.

Are calculators allowed on the MCAT?

No. Calculators are not allowed. Students must become comfortable with dimensional analysis, unit conversions, estimation, scientific notation, logarithms, proportional reasoning and order-of-magnitude checks.

How important is Organic Chemistry for MCAT Chem/Phys?

Organic Chemistry is important because MCAT questions often test structure, bonding, functional groups, stereochemistry, carbonyl chemistry, separations, spectroscopy and reaction logic. The emphasis is usually on application and reasoning rather than memorising long reaction lists.

How should a student prepare for MCAT Chemistry passages?

A student should first repair weak concepts, then practise passage interpretation, equation selection, unit handling, graph reading, elimination of wrong answer choices and timed review. Repeated analysis of mistakes is essential.

MCAT Student Reviews

After the session I finally understood resonance structures of organic compounds. This is a high yield topic on the MCAT. I wish my college professor could teach as well as Uma.

MCAT Chemistry Tutoring — Frequently Asked Questions

How does Dr Uma Sharma help with MCAT Chemistry preparation?

Dr Uma Sharma begins by diagnosing weak areas in General Chemistry, Organic Chemistry, chemistry-linked Biochemistry and MCAT-style chemistry math. Classes then combine concept rebuilding, chemistry passage modelling, no-calculator problem solving, timed drills, quizzes, homework and error-log review.

Is this suitable for students with weak chemistry foundations?

Yes. Many MCAT students have forgotten earlier chemistry or studied it without strong conceptual clarity. The classes rebuild high-yield foundations before moving to difficult passages and timed practice.

Do classes focus only on content or also on test strategy?

Both are covered. Content is taught clearly, but the student also learns how to read MCAT passages, identify the tested idea, avoid traps, use units, estimate quickly and review mistakes systematically.

Does this cover the full MCAT Chem/Phys section?

No. This is MCAT Chemistry tutoring. It supports the chemistry topics within Chem/Phys, especially General Chemistry, Organic Chemistry and chemistry-linked Biochemistry.

Are the sessions recorded?

Yes. Live sessions are recorded so students can revise explanations, solved passages, math shortcuts and recurring mistake patterns later.

Are quizzes and homework provided?

Yes. Students receive topic-wise practice, quizzes, homework and timed drills. Mistakes are reviewed so that weak areas are not repeated.

How does the free trial session work?

The free trial session is for 20 minutes. It helps the student discuss their MCAT timeline, current score range, weak chemistry areas and whether one-on-one or small-group chemistry support is more suitable.

MCAT Chemistry Topics Covered

General Chemistry (GC)

UNIT 1 — Atomic Nucleus (GC)

1.1 Atomic number, Atomic weight
1.2 Neutrons, Protons, Isotopes
1.3 Radioactive decay: α, β, γ decay
1.4 Half-life, exponential decay, semi-log plots
1.5 Mass spectrometer

UNIT 2 — Electronic Structure (GC)

2.1 Orbital structure of hydrogen; principal quantum number n; electrons per orbital (GC)
2.2 Ground state, Excited states
2.3 Absorption and Emission line spectra
2.4 Pauli Exclusion Principle
2.5 Paramagnetism and Diamagnetism
2.6 Conventional notation for electronic structure (GC)
2.7 Bohr atom
2.8 Heisenberg uncertainty principle
2.9 Effective nuclear charge (GC)
2.10 Photoelectric effect

UNIT 3 — Periodic Table — Classification & Trends (GC)

3.1 Alkali metals
3.2 Alkaline earth metals: chemical characteristics
3.3 Halogens: chemical characteristics
3.4 Noble gases: physical & chemical characteristics
3.5 Transition metals
3.6 Representative elements
3.7 Metals and non-metals
3.8 Oxygen group
3.9 Variation of properties with group and row
3.10 Valence electrons
3.11 First and second ionization energy
3.12 Predictions from electronic structure (across groups/rows)
3.13 Electron affinity (trend)
3.14 Electronegativity (trend)
3.15 Comparative values for representative elements/groups
3.16 Electron shells and sizes of atoms
3.17 Electron shells and sizes of ions

UNIT 4 — Stoichiometry (GC)

4.1 Molecular weight
4.2 Empirical vs molecular formula
4.3 Common metric units in chemistry
4.4 Percent composition by mass
4.5 Mole concept; Avogadro’s number NA
4.6 Density (definition, use)
4.7 Oxidation number
4.8 Common oxidizing and reducing agents
4.9 Disproportionation reactions
4.10 Chemical equations: describing reactions
4.11 Conventions for writing equations
4.12 Balancing equations, including redox
4.13 Limiting reactants
4.14 Theoretical yield

UNIT 5 — Covalent Bond (GC)

5.1 Lewis electron-dot formulas
5.2 Resonance structures
5.3 Formal charge
5.4 Lewis acids and bases
5.5 Partial ionic character
5.6 Electronegativity and charge distribution
5.7 Dipole moment
5.8 σ and π bonds
5.9 Hybrid orbitals: sp3, sp2, sp and geometries
5.10 VSEPR: shapes (e.g., NH3, H2O, CO2)
5.11 Structural formulas: H, C, N, O, F, S, P, Si, Cl
5.12 Delocalized electrons and resonance (ions & molecules)
5.13 Multiple bonding: effects on length/energy
5.14 Rigidity in molecular structure
5.15 Liquid phase: intermolecular forces
5.16 Hydrogen bonding
5.17 Dipole–dipole interactions
5.18 London dispersion (van der Waals) forces

UNIT 6 — Energy Changes — Thermochemistry & Thermodynamics (GC)

6.1 Thermodynamic systems; state functions
6.2 Zeroth Law — temperature
6.3 First Law — energy conservation in processes
6.4 PV diagrams and pressure–volume work in thermodynamics
6.5 Second Law — entropy concept
6.6 Entropy as “disorder”; relative S(gas) > S(liquid) > S(crystal)
6.7 Calorimetry; heat capacity; specific heat
6.8 Heat transfer in calorimetry and phase changes
6.9 Endothermic vs exothermic (GC)
6.10 Enthalpy; standard heats of reaction and formation
6.11 Hess’s Law of Heat Summation
6.12 Bond dissociation energy & heats of formation (GC)
6.13 Spontaneity and ΔG° (GC)
6.14 Thermal expansion concepts where linked to physical chemistry
6.15 Phase diagrams: P–T relationships

UNIT 7 — Rate Processes — Kinetics (GC)

7.1 Reaction rate
7.2 Rate vs reactant concentration
7.3 Rate law; rate constant
7.4 Reaction order
7.5 Rate-determining step
7.6 Temperature dependence of rate
7.7 Activation energy
7.8 Transition state (activated complex)
7.9 Energy profiles: reactants, products, Ea, ΔH
7.10 Arrhenius equation
7.11 Kinetic vs thermodynamic control
7.12 Catalysts

UNIT 8 — Equilibrium in Reversible Reactions (GC)

8.1 Law of Mass Action
8.2 Le Châtelier’s Principle — applications
8.3 Equilibrium constant and ΔG° (relationship)

UNIT 9 — Acid–Base Equilibria (GC, BC)

9.1 Brønsted–Lowry vs Lewis acids/bases; conjugate pairs
9.2 Strong/weak acids & bases; Ka, Kb; pKa, pKb
9.3 Autoionization of water; pH, pOH, Kw
9.4 Buffers & Henderson–Hasselbalch; buffer capacity
9.5 Acid–base titration curves; choice of indicators
9.6 Polyprotic acids; amphiprotic species
9.7 Salt hydrolysis; common-ion effect
9.8 Speciation vs pH; fractional composition
9.9 Equilibrium constant and ΔG° (connections)

UNIT 10 — Ions in Solution (GC, BC)

10.1 Common ions & charges (e.g., NH4+, PO4^3−, SO4^2−)
10.2 Hydration; hydronium ion

UNIT 11 — Solubility (GC)

11.1 Concentration units (e.g., molarity)
11.2 Ksp — solubility product and expression
11.3 Common-ion effect; separations
11.4 Complex ion formation
11.5 Complex ions and solubility

UNIT 12 — Titration (GC)

12.1 Indicators
12.2 Neutralization
12.3 Interpreting titration curves
12.4 Redox titrations

UNIT 13 — Electrochemistry (GC)

13.1 Galvanic vs electrolytic cells; half-reactions
13.2 Cell notation; standard potentials; Nernst equation
13.3 Le Châtelier-type shifts and cell potential
13.4 Relationship among E°, K, and ΔG°

UNIT 14 — Gases (GC)

14.1 Gas laws (Boyle, Charles, Avogadro)
14.2 Ideal gas law; kinetic molecular theory
14.3 Real gases; van der Waals corrections
14.4 Partial pressures; stoichiometry with gases

UNIT 15 — Solutions (GC)

15.1 Osmosis
15.2 Colligative properties; osmotic pressure
15.3 Henry’s Law

Organic Chemistry (OC)

UNIT 1 — Separations and Purifications (OC, BC)

1.1 Liquid–liquid extraction between immiscible solvents
1.2 Distillation (simple, fractional)
1.3 General principles of separations
1.4 Column chromatography
1.5 Gas–liquid chromatography
1.6 High-pressure liquid chromatography (HPLC)
1.7 Paper chromatography
1.8 Thin-layer chromatography (TLC)
1.9 Separation/purification of peptides & proteins (BC)
1.10 Racemic mixtures; resolution of enantiomers

UNIT 2 — Three-Dimensional Protein Structure (BC)

2.1 Quaternary structure (BIO, BC)
2.2 Hydrophobic interactions
2.3 Solvation layer (entropy)
2.4 Denaturing and folding

UNIT 3 — Nucleic Acid Structure and Function (BIO, BC)

3.1 Nucleotides and nucleosides
3.2 Sugar–phosphate backbone
3.3 Pyrimidine and purine residues
3.4 DNA double helix; Watson–Crick model
3.5 Base pairing: A–T and G–C
3.6 Transmission of genetic information (BIO)
3.7 DNA denaturation, reannealing, hybridization

UNIT 4 — Carbohydrates (BC, OC)

4.1 Nomenclature and classification; common names
4.2 Absolute configuration
4.3 Cyclic structures and conformations of hexoses
4.4 Epimers and anomers
4.5 Hydrolysis of the glycoside linkage
4.6 Keto–enol tautomerism of monosaccharides
4.7 Disaccharides (BC)
4.8 Polysaccharides (BC)

UNIT 5 — Lipids (BC, OC)

5.1 Storage: triacylglycerols; free fatty acids; saponification
5.2 Structural: phospholipids & phosphatids; sphingolipids (BC); waxes
5.3 Signals/cofactors: fat-soluble vitamins; steroids; prostaglandins (BC)

UNIT 6 — Aldehydes and Ketones (OC)

6.1 Nomenclature and physical properties
6.2 Oxidation of aldehydes
6.3 Enolate chemistry: keto–enol; α-racemization; aldol/retro-aldol; kinetic vs thermodynamic enolates
6.4 Substituent effects on C=O reactivity; sterics; acidity of α-H; carbanions

UNIT 7 — Alcohols (OC)

7.1 Nomenclature & properties (acidity, hydrogen bonding)
7.2 Reactions: oxidation; SN1/SN2; protection; mesylates & tosylates

UNIT 8 — Carboxylic Acids (OC)

8.1 Nomenclature and physical properties
8.2 Amides (incl. lactams), esters (incl. lactones), anhydrides; reduction; decarboxylation
8.3 α-Substitution

UNIT 9 — Acid Derivatives — Anhydrides, Amides, Esters (OC)

9.1 Nomenclature; physical properties
9.2 Key reactions: oxidation; substitution (SN1/SN2); protections
9.3 Reactivity trends; steric/electronic effects; ring strain (β-lactams)
9.4 Phenols (OC, BC): redox (hydroquinones, ubiquinones)

UNIT 10 — Polycyclic & Heterocyclic Aromatic Compounds (OC, BC)

10.1 Biological aromatic heterocycles
10.2 Chromatography: size-exclusion, ion-exchange, affinity (overview)
10.3 Electrophoresis (overview)
10.4 Amino acids, peptides, proteins — links to BC units

Chemistry-linked Biochemistry (BC)

UNIT 1 — Amino Acids, Peptides, Proteins (OC, BC)

1.1 Absolute configuration at the α position
1.2 Amino acids as dipolar ions
1.3 Classification: acidic/basic
1.4 Classification: hydrophobic/hydrophilic
1.5 Cysteine ↔ cystine sulfur linkage
1.6 Peptide linkage; polypeptides and proteins
1.7 Hydrolysis

UNIT 2 — Protein Structure (BIO, BC, OC)

2.1 Primary structure (1°)
2.2 Secondary structure (2°)
2.3 Tertiary structure (3°): proline, cystine, hydrophobic bonding
2.4 Quaternary structure (4°)
2.5 Conformational stability: denaturing & folding
2.6 Conformational stability: hydrophobic interactions
2.7 Conformational stability: solvation layer (entropy)
2.8 Isoelectric point (pI)
2.9 Electrophoresis

UNIT 3 — Non-Enzymatic Protein Function (BIO, BC)

3.1 Binding
3.2 Immune system
3.3 Motors

UNIT 4 — Enzyme Structure and Function (BIO, BC)

4.1 Role of enzymes in catalysis
4.2 Classification by reaction type
4.3 Lowering activation energy
4.4 Substrates and specificity
4.5 Active-site model
4.6 Induced-fit model
4.7 Cofactors
4.8 Coenzymes
4.9 Water-soluble vitamins
4.10 Effects of local conditions

UNIT 5 — Control of Enzyme Activity (BIO, BC)

5.1 Kinetics: general
5.2 Michaelis–Menten
5.3 Cooperativity
5.4 Feedback regulation
5.5 Inhibition: competitive
5.6 Inhibition: non-competitive
5.7 Inhibition: mixed (BC)
5.8 Inhibition: uncompetitive (BC)
5.9 Allosteric regulation
5.10 Covalent modification
5.11 Zymogens

UNIT 6 — Nucleic Acid Structure and Function (BIO, BC)

6.1 Sugar–phosphate backbone; nucleotides/nucleosides
6.2 Pyrimidine & purine residues
6.3 DNA double helix; Watson–Crick model
6.4 Base pairing: A–T, G–C
6.5 Transmission of genetic information (BIO)
6.6 DNA denaturation, reannealing, hybridization

UNIT 7 — Principles of Bioenergetics (BC, GC)

7.1 Equilibrium constant (K)
7.2 K and ΔG° (relationship)
7.3 Le Châtelier’s Principle
7.4 Endothermic vs exothermic
7.5 Free energy (G)
7.6 Spontaneity and ΔG°
7.7 ATP hydrolysis (large −ΔG°)
7.8 ATP group transfers
7.9 Biological redox: half-reactions
7.10 Soluble electron carriers
7.11 Flavoproteins

UNIT 8 — Carbohydrates (BC, OC)

8.1 Nomenclature and classification
8.2 Absolute configuration
8.3 Cyclic structures & conformations of hexoses
8.4 Epimers and anomers
8.5 Glycoside hydrolysis
8.6 Keto–enol tautomerism
8.7 Disaccharides
8.8 Polysaccharides

UNIT 9 — Glycolysis, Gluconeogenesis & Pentose Phosphate Pathway (BIO, BC)

9.1 Glycolysis (aerobic): substrates & products
9.2 Feeder pathways: glycogen & starch
9.3 Fermentation (anaerobic)
9.4 Gluconeogenesis (BC)
9.5 Pentose phosphate pathway (BC)
9.6 Net molecular/energetic results of respiration

UNIT 10 — Principles of Metabolic Regulation (BC)

10.1 Dynamic steady state (BIO, BC)
10.2 Regulation of glycolysis & gluconeogenesis
10.3 Glycogen metabolism
10.4 Glycogen synth/breakdown: allosteric & hormonal control
10.5 Analysis of metabolic control

UNIT 11 — Metabolism of Fatty Acids and Proteins (BIO, BC)

11.1 Description of fatty acids (BC)
11.2 Digestion, mobilization, transport of fats
11.3 β-Oxidation
11.4 Saturated vs unsaturated fats
11.5 Ketone bodies (BC)
11.6 Fatty-acid synthesis (BIO)
11.7 Non-template synthesis: lipids & polysaccharides (BIO)
11.8 Protein metabolism

UNIT 12 — Oxidative Phosphorylation (BIO, BC)

12.1 ETC & oxidative phosphorylation: overview, inputs/outputs
12.2 Electron transfer: NADH, NADPH
12.3 Electron transfer: flavoproteins
12.4 Electron transfer: cytochromes
12.5 ATP synthase; chemiosmotic coupling; proton motive force
12.6 Net molecular/energetic yields
12.7 Regulation of oxidative phosphorylation
12.8 Mitochondria, apoptosis, oxidative stress (BC)

UNIT 13 — Hormonal Regulation & Integration of Metabolism (BC)

13.1 Integration of hormone structure & function
13.2 Tissue-specific metabolism
13.3 Hormonal regulation of fuel metabolism
13.4 Obesity and regulation of body mass

UNIT 14 — Plasma Membrane (BIO, BC)

14.1 General function in cell containment
14.2 Tissue-specific metabolism
14.3 Lipid components: phospholipids (phosphatids), steroids, waxes
14.4 Protein components
14.5 Fluid Mosaic Model; membrane dynamics
14.6 Transport thermodynamics
14.7 Osmosis and osmotic pressure (GC)
14.8 Passive transport
14.9 Active transport & Na⁺/K⁺ pump
14.10 Membrane channels; membrane potential; receptors
14.11 Exocytosis and endocytosis
14.12 Intercellular junctions (gap, tight, desmosomes)

UNIT 15 — Biosignalling (BC)

15.1 Oncogenes, apoptosis
15.2 Gated ion channels: voltage-gated
15.3 Gated ion channels: ligand-gated
15.4 Receptor enzymes
15.5 G-protein-coupled receptors

UNIT 16 — Lipids (BC, OC)

16.1 Storage: triacylglycerols
16.2 Free fatty acids: saponification
16.3 Phospholipids and phosphatids
16.4 Sphingolipids (BC)
16.5 Waxes
16.6 Terpenes and terpenoids
16.7 Steroids
16.8 Signals/cofactors