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Exam Review

Key Facts: Bac PC (Physique-Chimie) Exam

The Bac Physique-Chimie speciality carries a coefficient of 16 in the French baccalaureat general (Ministere de l'Education nationale).

The written exam lasts 3 h 30 and consists of three independent exercises marked out of 20 points.

On the written paper, physics is worth 11 points and chemistry is worth 9 points out of 20.

The final speciality mark weights the written paper x0.8 and the ECE practical x0.2.

The ECE practical assessment lasts 1 hour and is marked out of 20.

The Terminale programme is organised into four themes covered at 6 hours of class per week.

Kepler's third law for circular orbits gives T^2/r^3 = 4*pi^2/(G*M), a constant for a given central mass.

Radioactive half-life relates to the decay constant by t1/2 = ln(2)/lambda, about 0.693/lambda.

Coefficient-16 French baccalaureat speciality: a 3 h 30 written paper (3 exercises, /20, physics 11 + chemistry 9) plus a 1-hour ECE practical (/20), covering four Terminale themes.

Sample Bac PC (Physique-Chimie) Practice Questions

Try these sample questions to review concepts for the Bac PC (Physique-Chimie) exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the Brønsted–Lowry model used in the French Terminale programme, an acid is best defined as a species that:

A.donates a hydrogen ion (H+) during a reaction

B.accepts a hydrogen ion (H+) during a reaction

C.accepts a pair of electrons

D.increases the OH- concentration of a solution

Explanation: In the Brønsted–Lowry definition central to the 'Constitution et transformations de la matière' theme, an acid is a proton (H+) donor and a base is a proton acceptor. Each acid/base belongs to a couple AH/A-.

2A solution has a hydronium-ion concentration [H3O+] = 1.0 x 10^-3 mol/L at 25 °C. What is its pH?

A.3.0

B.11.0

C.0.001

D.-3.0

Explanation: pH = -log([H3O+]) = -log(1.0 x 10^-3) = 3.0. This is an acidic solution because the pH is below 7 at 25 °C.

3The acid dissociation constant of a couple AH/A- is written Ka. The relationship linking pH and pKa for that couple in solution is the Henderson–Hasselbalch-type relation:

A.pH = pKa + log([A-]/[AH])

B.pH = pKa - log([A-]/[AH])

C.pH = pKa + log([AH]/[A-])

D.pH = -pKa + log([A-]/[AH])

Explanation: From Ka = [A-][H3O+]/[AH], taking the negative logarithm gives pH = pKa + log([A-]/[AH]). When [A-] = [AH], the pH equals the pKa, which marks the boundary of the predominance diagram.

4On a predominance diagram for the couple CH3COOH/CH3COO- (pKa = 4.8), for which pH does the basic form CH3COO- predominate?

A.pH > 4.8

B.pH < 4.8

C.pH = 4.8 only

D.pH < 0

Explanation: On a predominance diagram, the base (A-) predominates when pH > pKa. Above pH 4.8, [CH3COO-] exceeds [CH3COOH], so the acetate ion is the major species.

5During an acid–base titration monitored by pH-metry, the equivalence point is defined as the point at which:

A.the reactants have been introduced in stoichiometric proportions

B.the pH of the mixture is exactly 7

C.the indicator first changes colour permanently

D.the conductivity reaches its maximum value

Explanation: Equivalence is reached when the titrant and the analyte have been mixed in exactly stoichiometric proportions, so the limiting reactant changes. It corresponds to the steepest part (inflexion) of a pH-metric curve.

6In a strong-acid / strong-base titration of 20.0 mL of HCl at concentration c by NaOH at 0.10 mol/L, the equivalence volume is 15.0 mL. What is the concentration c of the HCl solution?

A.0.075 mol/L

B.0.13 mol/L

C.0.10 mol/L

D.0.30 mol/L

Explanation: At equivalence n(HCl) = n(NaOH), so c x 20.0 = 0.10 x 15.0. Thus c = (0.10 x 15.0)/20.0 = 0.075 mol/L.

7The rate of a chemical reaction (vitesse volumique) generally increases when the temperature rises. The factors that can increase reaction rate are called:

A.kinetic factors

B.inhibitors

C.buffers

D.catalysts only

Explanation: Temperature and reactant concentration are the two main kinetic factors (facteurs cinétiques) studied in Terminale: raising either generally speeds up the reaction. A catalyst is a separate way to accelerate without being consumed.

8A catalyst increases the rate of a chemical reaction. Which statement about a catalyst is correct?

A.It is not consumed overall and lowers the activation energy

B.It is consumed in equal amount to the limiting reactant

C.It changes the final equilibrium composition in its favour

D.It only works in the gas phase

Explanation: A catalyst provides an alternative reaction pathway with a lower activation energy, accelerating the reaction without being consumed overall. It does not shift the position of equilibrium, only the speed at which it is reached.

9For a reaction whose disappearance of reactant A follows first-order kinetics, the half-life t1/2 (temps de demi-réaction) is the duration after which:

A.the concentration of A is halved

B.the reaction is fully complete

C.the reaction rate becomes zero

D.the temperature has doubled

Explanation: The half-life (temps de demi-réaction) is the time required for the reactant concentration, or the remaining amount, to fall to half its initial value. For first-order kinetics this time is independent of the initial concentration.

10A reaction is monitored by spectrophotometry. The Beer–Lambert law states that the absorbance A of a coloured species is:

A.proportional to its concentration: A = epsilon x l x c

B.inversely proportional to its concentration

C.equal to the transmittance

D.independent of the path length

Explanation: Beer–Lambert's law gives A = epsilon x l x c, where epsilon is the molar absorption coefficient, l the path length and c the concentration. Because A is proportional to c, spectrophotometry can track concentration changes over time.

About the Bac PC (Physique-Chimie) Exam

The Physique-Chimie speciality of the French baccalaureat general is one of two coefficient-16 speciality subjects taken in the Terminale year. The terminal exam combines a 3 h 30 written paper of three independent exercises (marked out of 20, with physics on 11 points and chemistry on 9) and a 1-hour practical assessment of experimental competences (ECE), also out of 20. The official Eduscol programme is built around four themes: Constitution et transformations de la matiere, Mouvement et interactions, L'energie : conversions et transferts, and Ondes et signaux. Candidates use a calculator in exam mode and are given data case by case, with no general formula sheet. The subject prepares students for scientific higher education in France.

Exam sponsor: Ministere de l'Education nationale (France). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

100 questions

Time Limit

Written: 3 h 30; ECE practical: 1 h

Passing Score

Marked out of 20; baccalaureat awarded at average 10/20. Speciality coefficient 16 (written x0.8 + ECE x0.2).

Exam / Certification Fees

No separate fee for candidats scolaires (free public exam); candidats libres may pay minor administrative costs.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Ministere de l'Education nationale (France): official exam information

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

40%

Constitution et transformations de la matiere

Bronsted acid-base, pH, titrations, kinetics and catalysis, equilibrium and reaction quotient, redox, cells and electrolysis, radioactivity, organic synthesis.

22%

Mouvement et interactions

Kinematics, Newton's second law, motion in uniform fields, projectiles, satellites, Kepler's laws and Archimedes' upthrust.

20%

L'energie : conversions et transferts

Mechanical energy, work, first principle of thermodynamics, thermal transfers, ideal gas and black-body radiation.

18%

Ondes et signaux

Wave model of light, diffraction, interference, Doppler effect, sound, lenses, astronomical telescope, photon and RC circuits.

Preparing for the Bac PC (Physique-Chimie) Exam

What You Need to Know

Passing score: Marked out of 20; baccalaureat awarded at average 10/20. Speciality coefficient 16 (written x0.8 + ECE x0.2).
Exam length: 100 questions
Time limit: Written: 3 h 30; ECE practical: 1 h
Exam / certification fees: No separate fee for candidats scolaires (free public exam); candidats libres may pay minor administrative costs. Official sources

Using Our Practice Resources

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Bac PC (Physique-Chimie): Suggested Study Strategy

1Master the core formulas and their SI units: Newton's second law, Kepler's third law, the Beer-Lambert law, pH = -log[H3O+], radioactive decay and tau = RC.

2Practise full past papers (annales) under timed conditions; with three exercises in 3 h 30, allow about 70 minutes per exercise and keep 15 minutes for checking units and signs.

3Prepare the ECE separately by rehearsing lab protocols (titration, spectrophotometry, optics) from the national ECE situation bank.

4Always check units and orders of magnitude; many marks are lost on power-of-ten and unit-conversion errors (seconds, metres, mol/L).

5Balance revision across all four themes, since each written exercise usually targets a different theme and physics carries more marks than chemistry.

Frequently Asked Questions

How long is the written Bac Physique-Chimie exam and how is it structured?

The written paper lasts 3 h 30 and is made of three independent exercises marked out of 20, with physics worth 11 points and chemistry worth 9 points. There is no general formula sheet; data are supplied within each exercise.

What is the coefficient of the Physique-Chimie speciality?

It carries a coefficient of 16 in the baccalaureat general. The final speciality mark combines the written paper (weighted x0.8) and the ECE practical (weighted x0.2), each marked out of 20.

What is the ECE in physics-chemistry?

The ECE (evaluation des competences experimentales) is a 1-hour hands-on laboratory assessment, marked out of 20, testing skills such as titrations, kinetic studies or optics measurements drawn from a national bank of situations.

What topics are on the Terminale physics-chemistry programme?

Four themes: Constitution et transformations de la matiere (chemistry), Mouvement et interactions, L'energie : conversions et transferts, and Ondes et signaux. Only the Terminale programme is examined.

When does the 2026 Bac Physique-Chimie exam take place?

The written speciality exams are held on 16-17 June 2026 and the ECE practical from 2-5 June 2026, on dates set nationally by the Ministere de l'Education nationale.