Sapo: So that the fear of chemistry no longer haunts students before the National High School Exam, today let’s explore together some tips for taking chemistry multiple-choice tests for university entrance exams in an easy and effective way.
Learn effective tips for taking chemistry multiple-choice tests for university entrance exams
Effective Tips for Chemistry Multiple-Choice Tests in University Entrance Exams
Chemistry is a subject with a heavy knowledge load, requiring students to remember some important points. Below, we will share with you some quick tips for choosing answers in chemistry multiple-choice tests for university entrance exams:
1. If the question is about a valence III element, think of Al first. For metals with valence I, eliminate Cu, Cr, and Fe.
2. If the question involves metal A reacting with H2SO4 or HNO3 producing NO2, NO, or SO2, you can eliminate Mg, Zn, Al, and alkaline earth metals. Prioritize answers involving Fe, Cu, Ag.
3. Eliminate answers with rare or uncommon metals, and prioritize common metals.
4. If the question mentions amphoteric substances, immediately think of Al, Al2O3, Al(OH)3, then Cr and Zn.
5. Questions about hard water: hard water contains Mg2+ and Ca2+, temporary hard water contains Mg2+, Ca2+, and HCO3-, permanent hard water contains Mg2+, Ca2+, and Cl-, SO42-. When it comes to softening hard water, prioritize choosing Na2CO3 and Na3PO4 or K2CO3 and K3PO4.
6. When the test mentions alkali metals, choose answers related to the number 1; for alkaline earth metals, choose answers related to the number 2.
7. Memorize the mnemonic for the electrochemical series.
8. For theory questions, the longest answer is often correct.
9. Remember some key numbers: The reaction to produce NH3 has a yield H = 25%, the concentration of HCHO for embalming is 37 - 40%.
10. For exercises to find the molecular formula of amines/chemical compounds in combustion problems: Use the ratio formula Number of C: Number of H: Number of N = n(CO2) : 2*n(H2O) : 2*n(N2).
University Chemistry Exam Experience for Students
Allocate Time for Each Question
The simplest tip for chemistry multiple-choice tests in university entrance exams is to allocate time for each question. First, you should carefully consider the volume and difficulty of each question to decide how much time to spend on each. Then, divide your time reasonably for each part of the test by starting with the easy questions to boost your confidence and secure points. Leave the difficult questions for last.
Allocate time reasonably for each question
Avoid Using Incorrect Knowledge
An effective tip for chemistry multiple-choice tests is to master the knowledge to avoid mistakes and confusion. You need to read the question carefully to determine the requirements. Then, identify the necessary knowledge to apply and distinguish between concepts, avoiding sticking to the first answer you think is correct. Double-check your knowledge if you are unsure.
Beware of Knowledge "Traps"
An important point for applying chemistry multiple-choice test tips effectively is to avoid knowledge “traps.” To do this, you need to:
- Read the question carefully to fully understand it.
- Pay attention to keywords in the question, such as "not," "except," "excluding," etc.
- If possible, try to guess the wording of the test maker to understand what they are asking.
Do Not Skip Any Question
A very effective tip is not to skip any question. This requires you to skillfully combine the above tips. Simply put, besides breaking down the questions, after completing them, you should review from top to bottom to ensure that no question is missed. You can also note down unanswered questions on a sticky note and review them after finishing the prioritized ones. Or you can mark the questions and review them later. Both methods help you control your test more easily.
Carefully Check the Answers
After completing all the questions, you need to carefully check the answers to make sure no question is missed and no basic mistakes are made. This requires you to have a solid foundation of knowledge and trust your own choices. Limit changing your answers at the last minute, as it is usually the wrong answer.
Master basic chemistry knowledge to avoid mistakes
Applying these chemistry multiple-choice tips can help you increase your chances of success in university entrance exams. By carefully checking your answers, avoiding common mistakes, and allocating your time wisely, you can be more confident when facing exam questions. Remember to practice regularly and prepare thoroughly to achieve the best results in your exam. Good luck!