FAST REVISION - Chemistry

 Important points 👍

🧩Dalton’s Atomic Theory:

🔼Every matter consists of indivisible atoms.

📛Atoms can neither be created nor destroyed.

📛Atoms of a given element are identical in  properties

📛Atoms of different elements differ in properties.

☑️Atoms of different elements combine in a fixed ratio to form molecule of a compound.

🟠🟩🟢Precision and Accuracy: 🟩🟢🟠

➖Precision: Closeness of outcomes of different measurements taken for the same quantity. 

➖Accuracy: Agreement  of experimental value to the true value 

🧩Laws of Chemical Combination:

🔴🟥🔵Law of conservation of mass: 🔴🟥🔵

“For any chemical change total mass of active reactants are always equal to the mass of the product  formed”

🟤🟦🔵Law of constant proportions:🟦🔵🟥

 “A chemical compound always contains same elements in definite proportion by mass and it does not  depend on the source of compound”.

🟪🟣🟧Law of multiple proportions:🟪🟣🟧

 “When two elements combine to form two or more than two different compounds then the different masses  of one element B which combine with fixed mass of the other element bear a simple ratio to one another” 

➖◻️🟣Law of reciprocal proportion: ◻️🟪

“ If two elements B and C react with the same mass of a third element (A), the ratio in which they do so will    be the same or simple multiple if B and C reacts with each other”.

🔴Gay Lussac’s law of combining volumes: 

“At given temperature and pressure the volumes of all gaseous reactants and products bear a    simple whole number ratio to each other