Chemical Formulae, Equations And Calculations
Akopọ
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.
Awọn Afojusun
- 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
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Chemical Formulae, Equations And Calculations. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Chemical Formulae, Equations And Calculations? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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