GCSE Chemistry Answer Booklet Factfile Unit 1 and 2 - Answers

Sep 5, 2026

Revised GCSE Chemistry support materials providing answer solutions for Factfile Unit 1 and Unit 2, including atomic structure, bonding, structures, nanoparticles, and symbols, formulae and equations. The booklet covers particle charges and masses, atomic and electronic structure reasoning, ion formation and bonding models, dot-and-cross diagrams, giant covalent structures, alloys and corrosion ideas, nanoparticle properties, and balanceable chemical reactions. Mark guidance is included for structured responses.

LanguageEnglish

CategoryExam

FormatPDF

Pages32

Reading Time1 h 21 min

AccessFree to download

ANSWERS TO GCSE FACTFILES UNIT 1

1.1 Atomic Structure

1.2 Bonding

1.3 Structures

1.4 Nanoparticles

1.5 Symbols, formulae and equations

GCSE Revised GCSE Support Material Chemistry ANSWER BOOKLET Factfile Unit 1 & 2 For first teaching from September 2017 Answers to GCSE Factfiles Unit 1 1.1 Atomic Structure 1.(a) | Particles | Relative charge | Relative mass | | --- | --- | --- | | electron | -1 | 1
1840 | | proton | +1 | 1 | | neutron | 0 | 1 | 6 correct = [3]; 4 or 5 correct = [2]; 2 or 3 correct = [1] [3] (b) carbon-14 has 8 neutrons [1] carbon-12 has 6 neutrons [1] both have 6 protons and 6 electrons/same number of protons and electrons [1] [3] 2.(a) as 1 [1] 2, 6 and cross essential × ×× ●● ●● ● ● ● ● (b) outer electron in lithium atom transferred to oxygen [1] 2 lithium atoms to one oxygen atom [1] oxygen gains two electrons in its outer shell [1] [3] 3. proton = has a relative mass of 1 and a charge of +1 [1] mass number = total number of protons and neutrons in an atom [1] atomic number = the number of protons in an atom [1] [3] 4.(a) 2 [1] (b) oxygen [1] (c) 2, 8, 1 [1] (d) equal numbers of protons and electrons [1] 5. 6.(a) | Atom/Ion | Number of
protons | Electronic configuration | | --- | --- | --- | | N [1] | 7 | 2, 5 | | O2- | 8 [1] | 2, 8 [1] | | Al3+ | 13 [1] | 2, 8 [1] | | Mg2+ [1] | 12 | 2, 8 | [6] | | Number of
protons | Number of
electrons | Number of
neutrons | | --- | --- | --- | --- | | Neon-20 | 10 | 10 | 10 | | Neon-21 | 10 | 10 | 11 | | Neon-22 | 10 | 10 | 12 | [1] for number of protons and number of electrons correct [1] [1] for number of neutrons correct [1] [2] (b) relative atomic mass = 20×90~~ ~~.~~ ~~92+211×000.~~ ~~26+22×8~~ ~~.82 = 2017100.9 = 20.179 [1] answer to 2 decimal places = 20.18 [1] [2] 1.2 Bonding 1.(a) × ×× ×× ×× × × ×× ●● ●● ●● ● ● ● ● ● ●● ●● ● ● sodium atom as 2, 8, 1 [1] chlorine atom as 2, 8, 7 [1] dot and cross not essential [2] (b) Indicative content • Transfer of electrons • Correct direction of transfer from sodium to chlorine • 1 electron transferred • electronic structure for sodium ion (2, 8) • Correct charge on ions as Na+ and Cl- • Correct electronic structure for chloride ion (2, 8, 8) • Ions held together due to attraction of oppositely charged ions | Band | Response | Mark | | --- | --- | --- | | A | Candidates must use appropriate scientific terms throughout to describe fully how atoms of sodium and chlorine form sodium chloride using 5–7 of the points in the indicative content. They use good spelling, punctuation and grammar and the form and style are of a high
standard. | [5] – [6] | | B | Candidates use 3–4 points from the indicative content to describe how atoms of sodium and chlorine form sodium chloride using some scientific terms. They use satisfactory spelling, punctuation and grammar and the form and style are of a satisfactory standard. | [3] – [4] | | C | Candidates use 1-2 of the points from the indicative content to describe how atoms of sodium and chlorine form sodium chloride. They use limited spelling, punctuation and grammar and make little use of scientific terms. The form and style are of a limited standard. | [1] – [2] | | --- | --- | --- | | D | Response not worthy of credit | [0] | [6] 2.(a)(i) correct sharing of electrons [1] correct lone pairs of electrons [1] dot and cross diagram [1] [3] (ii) both circled lone pairs indicated [1] (b)(i) two atoms in a molecule [1](ii) N × × × ● ● ● N ● ● correct sharing of electrons [1] correct lone pairs of electrons [1] dot and cross diagram [1] [3] 3.(a) 2 × sodium atom as 2, 8, 1 [1] oxygen atom as 2, 6 [1] 2 × sodium ions as 2, 8 [1] oxide ion as 2, 8 [1] Na+ [1] O2- [1] [6] (b) ions are held together by attraction [1] of oppositely charged ions [1] [2] 1.3 Structures 1.(a) C [1] conducts electricity when molten but not when solid [1] [2] (b) D [1] (c) E [1] (d) A [1] diamond [1] [2] 2.(a) layers [1] of positive ions [

FAQs

What topics are covered in the GCSE Chemistry answer booklet for Factfile Unit 1 and 2?

It covers atomic structure, bonding, structures, nanoparticles, and symbols, formulae and equations, with answer solutions and mark guidance.

How does the booklet approach electron transfer and ion formation?

It provides indicative steps such as electron transfer from sodium to chlorine, correct direction of transfer, charges on Na+ and Cl-, and the resulting electronic structures.

What kind of responses are used to explain bonding and structures?

Answers include reasoning using scientific terms, such as sharing of electrons for dot-and-cross diagrams, covalent bonding descriptions, and explanations of delocalised electrons and layer sliding.

Sep 5, 2026

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