Guys i really need someone to explain IGCSE chemistry to me there is stuff that i dont understand. PL HELP MY EXAM ISIN 3 MONTHS
like a utor

I might not be able to explain all of what you need explained. However here are some tips. If you're really having trouble with specifics just comment questions below.

Make flashcards                                                                                             "IGCSE Chemistry means learning a whole lot of equations, reaction conditions and oxidation states. Making flashcards with all these details can be really helpful to reinforce everything you need to know. Moreover, flash cards are a great tool to review your chemistry as you are on the bus or waiting at your dentist’s office. Looking at flashcards repeatedly will help you remember things better. You can consider making decks for different parts of the course. Having a deck for organic chemistry, reactions with metals, acid base reactions, organic nomenclature, tests for gases and ions and common polyatomic ions with their oxidation states can be beneficial. If you prefer having your card decks online, Quizlet is a great tool to use!"

Find a study buddy                                                                                          "Often while studying you may find you have a lot more questions than you initially anticipated. If it’s the Saturday before your Monday exam and you aren’t able to get in touch with your teacher to answer your questions, it can be useful to have a study buddy who you can clarify your doubts. Likewise explaining concepts to your study buddy helps you solidify your understanding. Studying with someone is always nice and makes your study sessions fun! However, make sure to study with someone who you know you will be able to focus with. "

Use that highlighter

"You may have heard the term active listening. Active listening means listening to assimilate information and this can be done by nodding, asking follow up questions or repeating what the other person is saying back.  Similarly, there exists the concept of active reading which is done with the intention of reading something to remember. Sometimes while reading a textbook the crux of the material can get lost in the words. Using a highlighter to highlight important words and phrases as you read makes sure you engage with the material without zoning out. It also helps you pick out the most important stuff so the second time you read your textbook you can focus on the important stuff you highlighted before. This will also help you study quicker. Happy active reading!"

All credit goes to IGCSE lanterna education for the text above besides the first paragraph and some of the second and third.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

false

because it does not have the potential to be entirely used up