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Here are the answers to the textbook questions. All of the past paper questions and mark schemes, organised by topic. Practical Exam Questions (organised by required practical) and a powerpoint containing photos of all of the required practicals. Multiple Choice Practice Questions.
- Year 12 as Chemistry
Here is the powerpoint used in class to introduce you to the...
- Year 12 as Chemistry
Equations for AA Chemistry Trile ward The mole (HT) moles = mass M r (relative atomic mass) You will have to learn each of the following equations off by heart for each examination paper, and know when and how to use them. Equations required for the Higher Tier papers only are marked with the symbol HT. Avogadro’s number (HT)
atoms in the formula. Example 1: hydrochloric acid (HCl) consists of one hydrogen atom (A 1) and one chlorine atom (A 35.5). The M of HCl = 1 + 35.5 = 36.5 Example 2: sulfuric acid (H₂SO₄) consists of two hydrogen atoms (A 1), one sulfur atom (A 32) and four oxygen atoms (A 16). The M of H₂SO₄ = (1 × 2) + 32 + (16 × 4) = 98
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Feb 1, 2021 · By applying Hess’s law the heat of formation equals to the sum of everything else. fH = atH (Na) + IEH(Na)+ atH(Cl) + eaH(Cl) + LattH. Rearrange to give LattH= fH - ( atH (Na) + IEH(Na)+ atH (Cl) eaH(Cl) ) LattH=-411 – (+107 + 496 + 122 + -349) = -787 kJmol-1. Born-Haber cycle: magnesium chloride. Mg2+ (g) + 2e-
Here is the powerpoint used in class to introduce you to the course. This includes the topics that you need to learn for the test in the second week. Official definitions from exam mark schemes. All of the information below is from the GCSE Chemistry specification.
Derive chemical equations from narrative descriptions of chemical reactions. Write and balance chemical equations in molecular, total ionic, and net ionic formats. The preceding chapter introduced the use of element symbols to represent individual atoms.
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equation refers to establishing the mathematical relationship between the quantity of reactants and products. The quantities are expressed as grams or moles. It takes practice to be able to write balanced equations. There are essentially three steps to the process: 1. Write the unbalanced equation.
