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Elements, compounds and mixtures
Revision and exam practice for Elements, compounds and mixtures.
30
Objectives
10
Flashcards
10
Questions
90 min
Study time
OcrGcseChemistry A GatewayElements, compounds and mixtures
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30 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 Data to Distinguish Pure from 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 Formula1 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.
The Importance of Formulations in Everyday Materials1 objectives
- Account for many useful materials are formulations of mixtures.
Separating Mixtures: Filtration, Crystallisation, Simple Distillation, 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 Chromatography Techniques: Paper and Thin Layer1 objectives
- Communicate the key features of the techniques of paper and thin layer chromatography.
Understanding Chromatography: A Separation Technique1 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 Calculating Rf Values1 objectives
- Draw supported meaning from chromatograms, including measuring R values f.
Choosing Purification Techniques1 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-metals: Properties and Differences1 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 Position in the Periodic Table for 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.
Periodic Table, Electron Arrangement, and Atomic Number1 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 Bonding1 objectives
- Account for chemical bonding in terms of electrostatic forces and the transfer or sharing of electrons.
Understanding Dot and Cross Diagrams1 objectives
- Produce dot and cross diagrams for simple covalent and binary ionic substances.
Limitations of Chemical Models and Representations1 objectives
- Communicate the key features of the limitations of particular representations and models.
Electron Arrangement and Chemical 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.
From Mendeleev to the Modern Periodic Table: The Role of Atomic Number1 objectives
- Account for in terms of atomic number how Mendeleev’s arrangement was refined into the modern Periodic Table.
Carbon's Unique Bonding Capacity1 objectives
- Retrieve and apply knowledge of carbon can form four covalent bonds.
Why there are so many 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 Carbon Allotropes: Diamond, Graphite, Fullerenes, and Graphene1 objectives
- Account for the properties of diamond, graphite, fullerenes and graphene in terms of their structures and bonding.
Energy Transfers and Changes of State1 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 Points1 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.
Understanding Nano Dimensions: Comparing to Atoms and Molecules1 objectives
- Identify meaningful similarities and differences in ‘nano’ dimensions to typical dimensions of atoms and molecules.
Understanding Surface Area to Volume Ratio and its Impact on Properties1 objectives
- Communicate the key features of the surface area to volume relationship for different-sized particles and describe how this affects properties.
Nanoparticulate Materials: Properties and Uses1 objectives
- Communicate the key features of the way the properties of nanoparticulate materials are related to their uses.
Risks Associated with Nanomaterials1 objectives
- Account for the possible risks associated with some nanoparticulate materials.
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Practice preview
- Explain how electrostatic forces are responsible for holding atoms together in both ionic and covalent chemical bonds. Illustrate your answer by describing the electron arrangement in each type of bond. [6 marks]
- A solid compound is known to have a melting point of 85 °C. Which observation would indicate that a sample of this compound is pure?
- A substance is tested and found to be a poor conductor of electricity and is brittle. Which category does it most likely belong to?
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