BAC PHYSICS-CHEMISTRY. On May 11, some high schools passed their physics-chemistry specialty test. We have unveiled the issues and fixed them in this article. We will do the same today for those who take their test from 2 p.m.!
[Mis à jour le 12 mai 2022 à 12h28] Here we go again for the second session of the physics-chemistry specialty test! Yesterday, some of the final year students worked on their copy for 3h30. On leaving the room, they were able to find the right answers to scientific problems thanks to our online answer key. Same scenario for those who take the test this Thursday from 2 p.m.! The subject of the test and its answer key will soon be available in this article.
After this written test, everyone will continue in a few days with the practical oral test. A second equally important part for this subject, whose coefficient amounts to 16 in the final grade of the baccalaureate.
♦ The official subjects of the physics-chemistry specialty test on Wednesday May 11
The E127 dye, the physics of juggling, the cooling of a horseshoe, or even the cardiac defibrillator… These are the themes of the exercises offered to students in the physics-chemistry specialty for the first test of the 2022 baccalaureate on Wednesday May 12 . Knowledge questions were asked, but also dosage calculations or scientific explanations requested. 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. In partnership with Studyramadiscover below the details of the subjects:
♦ The subjects of the physics-chemistry specialty test in French Polynesia
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.
♦ What are the possible subjects for the physics-chemistry specialty test?
On what subjects will the candidates who pass the baccalaureate physics-chemistry specialty test be assessed this Thursday, May 12? The answer will fall shortly after 2 p.m., the start time of the exam. 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 can 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 assessed in the written test are not assessed 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
Yesterday, the first corrections of the exercises of the physics-chemistry test at the baccalaureate fell when the test ended, at 5:30 p.m. An associate professor was responsible for writing the answers and developments expected during the test to deliver a complete and detailed answer key for the exam to baccalaureate candidates. Same process for this Thursday, May 12: Linternaute, with his partner Studyrama, invites you to discover the answers to the various questions of the physics-chemistry test. These fixes will be available during the day. In the meantime, you can rediscover those of Wednesday, May 11:
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. Some of the candidates for the physics-chemistry exam were called on Wednesday 11 May. For others, the exam takes place this Thursday, May 12. 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 a subset, renewed every half-day, of at least two predominantly physical evaluation situations and two predominantly physical evaluation situations. 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.