2c (6 marker - will do later at some point) 3 (a). How does a metal conduct electricity? (4 marks) -Delocalised electrons can move through the metal -Transfer electrical charge -Sea of moving electrons (structure) -Lattice of positive ions (structure) 3(b). Describe the structure of an alloy is different to a metal (2 marks) -Different elements with different sizes -Distort layers in the mixture, preventing them from sliding over each other. OR -Irregular pattern of atoms. 3(c).
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Macroscopic physical properties such as melting and boiling points depend on the strengths of the forces which hold microscopic particles together. In the case of molecules whose atoms are connected by covalent bonds, such intermolecular forces may be of three types. All molecules are attracted together by weak London forces. These depend on instantaneous polarization and increase in strength with the size of the molecular electron cloud. When a molecule contains atoms whose electronegativities differ
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sulphur? A. Dissolving the mixture in water and then filtrate B. Passing a magnet over the mixture C. Melting the mixture followed by filtration D. Heating the mixture 7. Which of the following substances has a giant ionic structure? A. Iodine B. Diamond C. Sodium chloride D. Graphite 8. Which of the following INCREASES from left to right in period 3 of the periodic table? A. The number of shells in the atom of the elements
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Biology- The scientific study of life. Life is structured on a size scale ranging from the molecular (smallest components of life) to the global (Earth) scale. Biology encompasses a large variety of life on earth. Uses of Biology in every day life: Molecular Biology – (Biology that deals with the smallest components of life such as cells, DNA, RNA) is used to solve crimes and reveal ancestry. Ecology- The scientific study of interactions among organisms and their environment is used to address
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A high-level data model in business or for any functional area is an abstract model that documents and organizes the business data for communication between functional and technical people. It is used to show the data needed and created by business processes. A data model in software engineering is an abstract model that documents and organizes the business data for communication between team members and is used as a plan for developing applications, specifically how data are stored and accessed
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Mark Scheme (Results) June 2010 GCE GCE Chemistry (6CH01/01) Edexcel Limited. Registered in England and Wales No. 4496750 Registered Office: One90 High Holborn, London WC1V 7BH Edexcel is one of the leading examining and awarding bodies in the UK and throughout the world. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. Through a network of UK and overseas offices, Edexcel’s centres receive the support they
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Module 3 Waves and the Electromagnetic Spectrum Topic: Waves 1. What is a wave? A wave is vibration that travels and all waves are created by something vibrating. Waves transport energy but do not transport mass. 2. Describe the following terms associated with waves: a. amplitude height of wave b. wavelength length of a wave c. frequency number of waves per second (Hz) d. period how long a wave lasts when it arrives at a fixed point (measured in seconds) 3. What are radio waves
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1 UNIT 1 Living Things and Their Environment DRAFT April 29, 2014 Photo Credit: http://www.flyingfourchette.com/2013/05/25/around-ubud/ 2 UNIT 1: Living Things and Their Environment Introduction At this point, students have already learned in Grade 8 how the body breaks down food into forms that can be absorbed through the digestive system and then transported to each cell, which was on the other hand discussed in Grade 7 to be the basic unit of life. The learners have also discovered that cells
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How is the scientific method used to solve problems? Scientific method used to solve problems by keen observations, rational analysis, and experimentation. Observation: Closely observe the physical world around you. How is the scientific method used to solve problems? Scientific method used to solve problems by keen observations, rational analysis, and experimentation. Observation: Closely observe the physical world around you. Question: Recognize a question or a problem. Hypothesis:
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02.13 General Certificate of Secondary Education January 2013 Additional Science / Chemistry (Specification 4408 / 4402) Unit 2: Chemistry 2 CH2HP Final Mark Scheme Error! Unknown document property name. – Error! Unknown document property name.- Chemistry – Error! Unknown document property name.– Error! Unknown document property name. 2013 Mark schemes are prepared by the Principal Examiner and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme
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