Chemical Formulae, Equations And Calculations
Gbogbo ọrọ náà
Chemical equations are the language of chemistry. Every reaction, from rusting iron to baking bread, can be described precisely using formulae and balanced equations. Being able to write, balance, and calculate from equations is one of the most essential skills in the entire IGCSE course.
In this lesson you will learn how to write word and balanced symbol equations with state symbols, calculate relative formula masses, work with moles, find reacting masses and percentage yield, and determine empirical and molecular formulae from experimental data. These calculations appear on every exam paper.
Ebumnobi
- Write word equations and balanced chemical equations (including state symbols)
- Calculate relative formula 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 and relative formula mass
- Calculate reacting masses using experimental data and chemical equations
- Calculate percentage yield
- Understand how the formulae of simple compounds can be obtained experimentally
- Know what is meant by the terms empirical formula and molecular formula
- Calculate empirical and molecular formulae from experimental data
- Know how to determine the formula of a metal oxide by combustion or by reduction
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
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 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 4.0 g of sodium hydroxide, NaOH? (Mr = 40) A) 0.01 B) 0.10 C) 1.0 D) 4.0 Answer: B
- Which state symbol represents a substance dissolved in water? A) (s) B) (l) C) (g) D) (aq) Answer: D
- A compound has the empirical formula CH2O and a relative formula mass of 60. What is the molecular formula? A) CH2O B) C2H4O2 C) C3H6O3 D) C6H12O6 Answer: B
- A reaction has a theoretical yield of 20 g and an actual yield of 15 g. What is the percentage yield? A) 25% B) 50% C) 75% D) 80% Answer: C
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
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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