Unit flashcards
Unit 2: Atoms, Elements and Compounds — one card for every lesson
Unit 2 overview: Atoms, Elements and Compounds
Atoms, Elements and Compounds Tap to flipUnit 2 overview: Atoms, Elements and Compounds
Unit 2 overview — CO-ORDINATED SCIENCES: Atoms, Elements and Compounds — 4 topics and 12 lessons. Work through the lessons in order, then use each lesson's Key terms and Common mistakes tabs to revise.TopicLessons2.1 Atomic Structure and the Periodic Table2.1.1…
Open the lessonElements, Compounds and Mixtures
Atoms, Elements and Compounds Tap to flipElements, Compounds and Mixtures
Classify substances as elements, compounds or mixtures.1A pure substance has a sharp melting point; impurities lower the melting point and make it melt over a range.2Pure water melts at 0 °C and boils at 100 °C at normal pressure.3Rf =…
Open the lessonAtomic Structure
Atoms, Elements and Compounds Tap to flipAtomic Structure
Describe the structure of an atom and the properties of its particles.1Atoms are neutral because the number of protons equals the number of electrons.2The nucleus is tiny compared with the whole atom but contains almost all the mass.3Electron shells fill…
Open the lessonElectronic Configuration
Atoms, Elements and Compounds Tap to flipElectronic Configuration
2.1.3 Electronic Configuration — CO-ORDINATED SCIENCES notes: Write the electronic configuration of the first twenty elements and their ions, and link it to an element's position in the Periodic Table.Shells and energyShells and energy Electrons move around the nucleus in…
Open the lessonIsotopes
Atoms, Elements and Compounds Tap to flipIsotopes
2.1.4 Isotopes — CO-ORDINATED SCIENCES notes: Define isotopes, explain why they share chemical properties but differ physically, and calculate relative atomic mass from isotope abundances.DefinitionDefinition isotopes are atoms of the same element with the same number of protons but different…
Open the lessonIons and Ionic Bonds
Atoms, Elements and Compounds Tap to flipIons and Ionic Bonds
2.2.1 Ions and Ionic Bonds — CO-ORDINATED SCIENCES notes: Describe the formation of positive and negative ions by electron loss or gain.Key ideasNa (2,8,1) → Na+ (2,8) + e–; Cl (2,8,7) + e– → Cl– (2,8,8).Mg (2,8,2) loses 2 electrons…
Open the lessonIonic Bonds and Lattice Structure
Atoms, Elements and Compounds Tap to flipIonic Bonds and Lattice Structure
2.2.2 Ionic Bonds and Lattice Structure — CO-ORDINATED SCIENCES notes: Describe how ionic bonds form between metals and non-metals, draw dot-and-cross diagrams, and describe the giant ionic lattice (Extended tier).metal positive ions delocalised electrons1Ionic compounds form when metal atoms react…
Open the lessonProperties of Ionic Compounds
Atoms, Elements and Compounds Tap to flipProperties of Ionic Compounds
2.2.3 Properties of Ionic Compounds — CO-ORDINATED SCIENCES notes: Explain the melting points, solubility and electrical conductivity of ionic compounds in terms of their giant lattice structure and the movement of ions.Giant ionic latticeGiant ionic lattice Ionic compounds consist of…
Open the lessonCovalent Bonds
Atoms, Elements and Compounds Tap to flipCovalent Bonds
2.3.1 Covalent Bonds — CO-ORDINATED SCIENCES notes: Explain how covalent bonds form by sharing pairs of electrons between non-metal atoms, and draw dot-and-cross diagrams of simple molecules with single bonds.hydrogen covalent bondhydrogen covalent shared pairethane covalent bondscovalent bond shared electronsSharing…
Open the lessonMolecules and Compounds
Atoms, Elements and Compounds Tap to flipMolecules and Compounds
2.3.2 Molecules and Compounds — CO-ORDINATED SCIENCES notes: Describe double and triple covalent bonds and draw dot-and-cross diagrams for molecules such as O2, N2, C2H4, CH3OH and CO2 (Extended tier).hydrogen covalent bondhydrogen covalent shared paircovalent bond shared electronsWhy more pairs?Why…
Open the lessonProperties of Simple Molecular Compounds
Atoms, Elements and Compounds Tap to flipProperties of Simple Molecular Compounds
2.3.3 Properties of Simple Molecular Compounds — CO-ORDINATED SCIENCES notes: State the physical properties of simple molecular compounds and explain them using intermolecular forces and the absence of charged particles (Extended tier).high melting poor conductor propertiesLow melting and boiling pointsLow…
Open the lessonDiamond and Graphite
Atoms, Elements and Compounds Tap to flipDiamond and Graphite
2.4.1 Diamond and Graphite — CO-ORDINATED SCIENCES notes: Describe the structures of diamond and graphite and explain their hardness, melting points, conductivity and uses in terms of bonding.Same element, different structureSame element, different structure Diamond and graphite are allotropes: different…
Open the lessonMetallic Bonding
Atoms, Elements and Compounds Tap to flipMetallic Bonding
2.4.2 Metallic Bonding — CO-ORDINATED SCIENCES notes: A metal is a giant lattice of positive ions surrounded by delocalised electrons.Key ideasMetals are giant lattices of positive ions in a sea of delocalised electrons — there are no separate metal molecules.Electrons…
Open the lesson