BAC PHYSICS-CHEMISTRY. On Wednesday 11 and Thursday 12 May, some baccalaureate candidates will take the physics-chemistry test. The first subjects of the specialty exam will finally be known tomorrow afternoon shortly after the start of the test scheduled for 2 p.m.
This Wednesday 11 and Thursday 12 May, at 2 p.m., baccalaureate candidates will take the physics-chemistry specialty test, at least those who have taken this course in first and final year. Calculator in hand and mathematical formulas in mind, candidates will have a little over three hours to complete three exercises. If the predictions are going well, the candidates will not have the pleasure of discovering the subjects of the test until the launch of the exam. Only the subjects who fell in French Polynesia are already known and allow metropolitan candidates to know, in broad outline, what to expect on the day of the test, even if of course each exercise will be different. As a reminder, the subjects of the physics-chemistry test offer a total of four exercises, the first is compulsory for all candidates but for the rest of the test, high school students are free to choose two exercises to perform out of the three present. All that remains is to know what the themes will be covered!
On what subjects will the candidates who pass the baccalaureate physics-chemistry specialty test be assessed? The answer will fall shortly after 2 p.m. tomorrow, when the exam begins. If some candidates take bets and choose to favor revisions on certain subjects rather than others, the practice involves risks. But it is indeed possible to ignore certain topics on the advice of the Ministry of National Education! For the 2022 baccalaureate session, the ministry has decided to make a distinction between the themes of the program according to three categories: those that can be assessed in even years, those in odd years and finally those that may fall on the baccalaureate each year. According to this new classification, find the list of themes likely to be at the heart of an exercise in the physics-chemistry test:
Theme “Constitution and transformations of matter”
- Determine the composition of a system by physical and chemical methods
- Modeling acid-base transformations by H+ hydrogen ion transfers
- Analyze a chemical system by physical methods
- Analyze a system by chemical methods
- Modeling the temporal evolution of a system, seat of a transformation
Monitor and model the temporal evolution of a system undergoing a chemical transformation
- Predicting the final state of a system, the site of a chemical transformation
- Predict the direction of the spontaneous evolution of a chemical system
- Compare the strength of acids and bases
- Develop strategies in organic synthesis
- Structure and properties
- Optimization of a synthesis step
Theme “Movement and interactions”
- Describe a movement
- Relate the actions applied to a system to its movement
Theme “Energy: conversions and transfers”
- Describe a thermodynamic system: example of the perfect gas model
- Carrying out energy balances on a system: the first law of thermodynamics
Theme “Waves and signals”
- Characterize wave phenomena (except the Dopplet effect and the Doppler shift)
- Form images, describe light by a flux of photons
Form images
- Study the dynamics of an electrical system
For the practical test, also called the evaluation of experimental skills, the ministry also excludes certain skills from the list of potential exam subjects. It should be noted that the themes of the program not evaluated in the written test are not evaluated during the practical exam either, but candidates who have followed the physics-chemistry specialty can also exclude other manipulations from their revisions:
- Create a battery and an electrical circuit integrating an electrolyser
- Use a device to study the buoyancy of Archimedes
- Measure pressure and flow velocity in a gas and in a liquid
- Use a photovoltaic cell
In physics and chemistry, candidates for the 2022 baccalaureate were subjected to three exercises: they had to answer the first but then had the choice of carrying out two exercises out of the three proposed.
For subject 1, that of Wednesday, May 4, the physics-chemistry test addressed the following topics:
- Compulsory exercise: The objective was to determine the yield of the laboratory synthesis of methyl benzoate by extraction of the ester obtained and by titration of the remaining benzoic acid.
- Exercise A: “A gravitational tractor to deflect an asteroid”. This method uses the mutual gravitational attraction between the asteroid and a spacecraft. It was therefore necessary to make a general study of the deviation of an asteroid, then to apply the deviation of Apophis.
- Exercise B: “Solar eclipse of June 10, 2021”. The high schools had to determine the magnification of the astronomical telescope used by an amateur during the observation of this eclipse, and to determine the approximate diameter of the Moon.
- Exercise C: “Acoustics of a room, the “blind places””. The objective was to study the diffraction of light waves and then to show how the phenomenon of diffraction of sound waves makes it possible to find the location of the student in the room.
Topic 2, the one on Thursday, May 5, presented these four other exercises:
- Compulsory exercise: sorrel salt is a chemical substance present in the form of a white, colorless and painless crystalline solid. The objective is to determine the type of acidity of oxalic acid, and to find the formulation of this acid in a household product.
- Test A: “A capacitive sensor”: this is a family of sensors using the capacitive effect to detect a variation of small distances. The exercise takes place in three parts: first, the theoretical study of the charge of an RC dipole; then, the experimental study. Finally, the study of a capacitor with variable capacity.
- Test B: “The planet Mercury”. They studied the movement of Mercury around the Sun, and the movement of the Messenger probe around Mercury.
- Test C: “Our ears are keen on it!” (5 points): in an information guide, high school students were able to read “you are exposed to 85dB and more if, in a line of cars, your neighbor hears your car radio with all the windows closed”. The objective of the exercise was to verify this assertion.
When is the physics-chemistry bac test scheduled?
After a postponement decided by the Ministry of National Education due to the consequences of the Covid-19 epidemic on the school system, the specialty tests for the 2022 baccalaureate are organized between Wednesday May 11 and Friday May 13 in France. metropolitan. Candidates for the physics-chemistry exam are expected in the afternoon of May 11 or 12, according to the first information available to the site.Student. Whatever the day of the test, the candidates will work from 2 p.m. to 5:30 p.m.
The day of thewritten test of physics and chemistry the candidates have 3h30 to compose. The exam is divided into two parts: the first is a compulsory exercise common to all candidates, for the second part high school students must complete two exercises with choices out of three offered. In terms of distribution of points, the first half of the test is assessed on ten points and the last two exercises are scored on five points each. To help the candidate in his choice, keywords are entered before each exercise to specify the main topics covered.
L’practical test, it lasts an hour. On the subject side, each academy retains a certain number of assessment situations from those available on a national bank of subjects. At the time of the examination, the candidate draws lots for an evaluation situation “from among a subset, renewed every half-day, of at least two predominantly physical evaluation situations and two predominantly chemistry”, indicates the Ministry of Education. The candidate then has one hour to carry out the requested manipulations.
When is the result of the physics-chemistry test published?
The results of the physics-chemistry specialty test must be published, like the results of the other baccalaureate tests, on July 5, 2022. Composed of two exams, the final physics-chemistry mark is obtained by multiplying the mark by 0.8 of the written part and by 0.2 that of the practical part.