Chemical Formulae, Equations And Calculations
Gbogbo ọrọ náà
Chemical equations are the language chemists use to describe what happens during a reaction, and the calculations that follow let you predict exactly how much product you will make from a given amount of reactant. These skills underpin every topic in the rest of the course, from acids and bases to organic chemistry.
This lesson covers word and symbol equations, relative formula mass, the mole concept, reacting mass calculations, percentage yield, empirical and molecular formulae, solution concentrations, and gas volume calculations. Mastering these will give you the quantitative toolkit that Edexcel tests heavily across both Paper 1 and Paper 2.
Ebumnobi
- write word equations and balanced chemical equations (including state symbols): - for reactions studied in this specification - for unfamiliar reactions where suitable information is provided.
- calculate relative formula masses (including relative molecular masses) (Mr) from relative atomic masses (Ar)
- know that the mole (mol) is the unit for the amount of a substance
- understand how to carry out calculations involving amount of substance, relative atomic mass (Ar) and relative formula mass (Mr)
- calculate reacting masses using experimental data and chemical equations
- calculate percentage yield
- understand how the formulae of simple compounds can be obtained experimentally, including metal oxides, water and salts containing water of crystallisation
- know what is meant by the terms empirical formula and molecular formula
- calculate empirical and molecular formulae from experimental data
- understand how to carry out calculations involving amount of substance, volume and concentration (in mol/dm3) of solution
- understand how to carry out calculations involving gas volumes and the molar volume of a gas (24 dm3 and 24 000 cm3 at room temperature and pressure (rtp))
- practical: know how to determine the formula of a metal oxide by combustion (e.g. magnesium oxide) or by reduction (e.g. copper(II) oxide)
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Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Chemical Formulae, Equations And Calculations. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- What is the relative formula mass (Mr) of sulfuric acid, H2SO4? (Ar: H = 1, S = 32, O = 16) A) 96 B) 98 C) 100 D) 49 Answer: B
- How many moles are in 4.4 g of carbon dioxide, CO2? (Ar: C = 12, O = 16) A) 0.05 B) 0.20 C) 0.10 D) 1.0 Answer: C
- At room temperature and pressure, what volume does 0.50 mol of any gas occupy? A) 6 dm3 B) 12 dm3 C) 24 dm3 D) 48 dm3 Answer: B
- A reaction has a theoretical yield of 25.0 g but only 20.0 g of product is collected. What is the percentage yield? A) 125% B) 80% C) 75% D) 20% Answer: B
- Which of these is the empirical formula of a compound with the molecular formula C6H12O6? A) C6H12O6 B) C3H6O3 C) CH2O D) CHO Answer: C
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
Reaction Stoichiometry
Explain the concept of stoichiometry as it pertains to chemical reactions
"Chemistry: Reaction Stoichiometry" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/4-3-reaction-stoichiometry. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Akụkụ akwụkwọ
Determining Empirical and Molecular Formulas
Compute the percent composition of a compound
"Chemistry: Determining Empirical and Molecular Formulas" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/3-2-determining-empirical-and-molecular-formulas. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Chemical Formulae, Equations And Calculations? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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