Titration Equipments/materials used: – Burret – 25ml pippett – Pippett filler – Cornical flask – HCl – 25ml unknown base solution – Phenolphthalein – Standing clamp Procedure: 1.Set up the equipments as shown below; 2.Put 100ml of HCl into the burret and measure out 25ml of unknown solution using pippett and the pippett filler and […]
Finding the relative atomic mass of an unknown metal by collecting gas Equipments/materials used: – 1.00moldm-3 of HCl – Weighing scale – 250cm3 measuring cylinder – 25cm3 measuring cylinder – Cornical flask – Delivery tube – Spatula – Bowl – Unknown metal, X Procedure: 1.Set up the apparatus as shown below; 2. Place between 0.15-0.20g […]
Empirical formula; is used as the simplest way of showing a formula. Example: 0.6075g of Mg and 3.995g of Br Ar: Mg, 24.3; Br, 79.9 Molar ratio- Mg; 0.6075/24.3 Br; 3.995/79.9 So, the ratio is 0.025:0.050 = 1:2 Finally, the empirical formula is MgBr2 Molecular formula tells the number of each type of atom that […]
Measurement of relative masses -Atomic masses are measured using a unit called the unified atomic mass unit, u. -The mass of an atom carbon-12 is defined as 12 u. Relative isotopic mass; is the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12. Relative atomic mass, […]
John Dalton’s theory: -Atoms are tiny particles that make up elements. -Atoms cannot be devided -All atoms of a given elements are the same. -Atoms of one element are different from other elements. Joseph John Thompson -During 1897-1906, he discovered that each particle had the following properties; it had negative charge, it could be deflected […]
This is my blog to post about some As level CHEMISTRY stuff!!
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