ma'am on 29th of February I have my chemistry multiple choice exam 0620/22. Can you give any tips??please

@user-ky7fe3kd1y Certainly! Here are some tips to help you ace your Cambridge multiple-choice chemistry exam: 1. **Understand the Format**: Familiarize yourself with the exam format, including the number of questions and time constraints. Since you have 40 questions in 45 minutes, time management is crucial. 2. **Study Strategically**: Focus on understanding key concepts and principles rather than memorizing isolated facts. Understanding the underlying principles will help you answer a broader range of questions. 3. **Practice Past Papers**: This will help you get used to the format of the exam while identifying areas where you need improvement 4**Master the Basics**: Ensure you have a solid understanding of fundamental concepts such as atomic structure, chemical bonding, stoichiometry, etc. These concepts often form the basis of more complex questions. 5**Pay Attention to Units**: Pay close attention to units in calculations and ensure consistency throughout your answers. 6 **Elimination Strategy**: If you're unsure about an answer, use the process of elimination. Eliminate obviously incorrect choices to increase your chances of selecting the correct one. 7 **Read Carefully**: Read each question carefully and pay attention to any keywords that may change the meaning of the question. Sometimes, small details can significantly impact the correct answer. 8**Manage Time Wisely**: Since time is limited, If you encounter a particularly challenging question, flag it and come back to it later if time allows. 9**Stay Calm and Focused**: Remain calm and focused during the exam. If you encounter difficult questions, don't panic. Take a deep breath, read the question again, and approach it systematically. Good luck!

thank you so much for your help and guidance. Insha Allah i will do good. But I'm scared about it.@@DrMonaSeif

methane is a primary component of natural gas so no

@@axonstudios3304 can we also write water from electrolysis or hydrocarbon instead of natural gas or it wont be specific enough.

Electrolysis can't be used because it's expensive. The main source of hydrogen is the reaction of Methane with steam

@@DrMonaSeif oh I thought we could crack alkanes into alkenes and hydrogen and then use hydrogen from there.

Increase in the oxidation state from -3 to +2 Means it lost electrons

@@DrMonaSeif yes i just realized i read the question wrong i thought it was the other way around tysm❤️

Can we say it lost electrons instead of saying it's oxidation number increased?