OCR A Level Chemistry A – Module 2 Foundations in Chemistry

2.1.2
Compounds, Formulae and Equations

Section 2.1.2 covers writing the formulae of ionic compounds from ionic charges and constructing balanced full and ionic equations with state symbols, for reactions studied and for unfamiliar reactions. These pages cover the equations; the ionic formulae page follows with the supplementary set.

Exam Paper

Paper 1 & 2

H432/01 and H432/02

Specification Points

2.1.2 (a) – (b)

2 learning outcomes

Topic Parts

1 of 2 live

Equations and Reaction Types

Exam Board

OCR A

H432 (2015 onwards)

Revision Notes

Work through 2.1.2 in a structured sequence.

Equations

Equations and
Reaction Types

Equations and Reaction Types

Writing and balancing full equations with state symbols, ionic equations, and the typical reactions of acids (2.1.2 (b)).

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Formulae

Ions and
Ionic Formulae

Ions and Ionic Formulae

Predicting ion charges from the Periodic Table, the seven named ions and constructing ionic formulae (2.1.2 (a)).

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Specification Coverage

2.1.2 Compounds, Formulae and Equations – OCR A Level Chemistry A

The following OCR A learning outcomes state what candidates should be able to do. Wording is taken from the OCR A Level Chemistry A (H432) specification.

2.1.2 Compounds, Formulae and Equations

2.1.2(a)

Formulae of ionic compounds

the writing of formulae of ionic compounds from ionic charges

prediction of ionic charge from the position of an element in the periodic table

ii)-a

recall of the name and formula for the nitrate ion, NO3–

ii)-b

recall of the name and formula for the carbonate ion, CO32–

ii)-c

recall of the name and formula for the sulfate ion, SO42–

ii)-d

recall of the name and formula for the hydroxide ion, OH–

ii)-e

recall of the name and formula for the ammonium ion, NH4+

ii)-f

recall of the name and formula for the zinc ion, Zn2+

ii)-g

recall of the name and formula for the silver ion, Ag+

2.1.2(b)

Balanced equations

construction of balanced chemical equations, including state symbols, for reactions studied

construction of balanced ionic equations, including state symbols, for reactions studied

iii

construction of balanced chemical equations (including ionic equations), including state symbols, for unfamiliar reactions given appropriate information

2.1.2Compounds, Formulae and Equations

Revision Notes

2.1.2 Compounds, Formulae and Equations – OCR A Level Chemistry A

2.1.2 Compounds, Formulae and Equations

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2.1.2
Compounds, Formulae and Equations