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Elements, compounds and mixtures
Revision and exam practice for Elements, compounds and mixtures.
26
Objectives
10
Flashcards
10
Questions
90 min
Study time
OcrGcseCombined Science A GatewayElements, compounds and mixtures
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26 objective pages available
Understanding Purity: Scientific vs. Everyday Meaning1 objectives
- Account for what is meant by the purity of a substance, distinguishing between the scientific and everyday use of the term ‘pure’.
Using Melting Point to Identify Pure and Impure Substances1 objectives
- Apply melting point data to distinguish pure from impure substances.
Understanding Relative Formula Mass (Mr)1 objectives
- Work out relative formula masses of species separately and in a balanced chemical equation.
Understanding Empirical Formulas1 objectives
- Develop knowledge and skill in the empirical formula of a compound from the relative numbers of atoms present or from a model or diagram and vice versa.
Understanding Formulations: Designing Materials for Specific Purposes1 objectives
- Account for many useful materials are formulations of mixtures.
Separating Mixtures: Filtration, Crystallisation, Simple and Fractional Distillation1 objectives
- Develop secure knowledge and application of describe, explain and exemplify the processes of filtration, crystallisation, simple distillation, and fractional distillation
Understanding Paper and Thin Layer Chromatography1 objectives
- Communicate the key features of the techniques of paper and thin layer chromatography.
Understanding Chromatography: Principles of Separation1 objectives
- Retrieve and apply knowledge of chromatography involves a stationary and a mobile phase and that separation depends on the distribution between the phases.
Interpreting Chromatograms and Rf Values1 objectives
- Draw supported meaning from chromatograms, including R measuring values f.
Choosing the Right Purification Technique1 objectives
- Apply biological knowledge to suggest suitable purification techniques given information about the substances involved.
Using Chromatography to Distinguish Pure from Impure Substances1 objectives
- Apply biological knowledge to suggest chromatographic methods for distinguishing pure from impure substances.
Understanding Metals and Non-Metals1 objectives
- Communicate the key features of metals and non-metals and explain the differences between them on the basis of their characteristic physical and chemical properties.
Atomic Structure and Periodic Table Position of Metals and Non-Metals1 objectives
- Account for the way the atomic structure of metals and non-metals relates to their position in the Periodic Table.
Understanding Element Positioning in the Periodic Table1 objectives
- Account for the way the position of an element in the Periodic Table is related to the arrangement of electrons in its atoms and hence to its atomic number.
Understanding Chemical Bonds and Structures1 objectives
- Communicate the key features of and compare the nature and arrangement of chemical bonds in: i. ionic compounds ii. simple molecules iii. giant covalent structures iv. polymers v. metals.
Understanding Chemical Bonding: The Force that Holds Atoms Together1 objectives
- Account for chemical bonding in terms of electrostatic forces and the transfer or sharing of electrons.
Understanding Dot and Cross Diagrams for Simple Covalent and Binary Ionic Substances1 objectives
- Produce dot and cross diagrams for simple covalent and binary ionic substances.
Understanding the Limitations of Models and Representations in Chemistry1 objectives
- Communicate the key features of the limitations of particular representations and models.
Relationship between Electron Arrangement, Atomic Number, and Reactivity1 objectives
- Account for the way the reactions of elements are related to the arrangement of electrons in their atoms and hence to their atomic number.
Refining the Periodic Table: From Mendeleev to Atomic Number1 objectives
- Account for in terms of atomic number how Mendeleev’s arrangement was refined into the modern Periodic Table.
Carbon's Covalent Bonding1 objectives
- Retrieve and apply knowledge of carbon can form four covalent bonds.
The Versatility of Carbon in Organic Compounds1 objectives
- Account for the vast array of natural and synthetic organic compounds occur due to the ability of carbon to form families of similar compounds, chains and rings.
Properties of Diamond, Graphite, Fullerenes, and Graphene1 objectives
- Account for the properties of diamond, graphite, fullerenes and graphene in terms of their structures and bonding.
Understanding Changes of State and Energy Transfers1 objectives
- Apply ideas about energy transfers and the relative strength of chemical bonds and intermolecular forces to explain the different temperatures at which changes of state occur.
Predicting States of Matter Using Melting and Boiling Point Data1 objectives
- Apply data to predict states of substances under given conditions.
How Bonding Affects Material Properties1 objectives
- Account for the way the bulk properties of materials (ionic compounds; simple molecules; giant covalent structures; polymers and metals) are related to the different types of bonds they contain, their bond strengths in relation to intermolecular forces and the ways in which their bonds are arranged.
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Practice preview
- Which statement accurately describes the melting behaviour of a pure substance?
- Explain how the bonding characteristics of carbon contribute to the vast number and diversity of organic compounds. [4 marks]
- A substance is tested and found to melt between 78°C and 82°C. What does this indicate about the substance?
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