Ex) Evaporation, Distillation 2) Pure Substance a) Elements Simplest form of matter Made up of one kind of atom Can’t be decomposed chemically I) Metals Luster Malleability (Strong Bonds) Ductile (Ability to draw into wire) Good conductors of heat/electricity Hard High melting points II) Non-Metals Dull Poor conductors Brittle Low melting point b) Compounds: 2 or more different elements chemically combined and chemically decompose B)
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oxidation number of a molecule, atom, or ion changes by gaining or losing an e-. They occur every day and are vital to some of the basic functions of life. Some examples include photosynthesis (within plants), respiration (within animals), combustion, and corrosion or rusting. To understand these types of reactions, you must first understand oxidation numbers or states. Rules for Assigning Oxidation States The oxidation number corresponds to the number of electrons, e-, that an atom loses, gains, or
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Benefits of the Ozone Gas Ozone (O3) is a natural gas comprising of three oxygen atoms and is a particularly an unstable fume. Ozone gas is visibly blue in color and has a sturdy odour regularly described as the whiff of air after a springtime electrical thunderstorm. Some people also refer to the odour as like the smell of watermelons. Normal oxygen (O2), which living beings except plants breathe, has dual oxygen atoms and is invisible and odourless. Despite its being a natural gas ozone can be manufactured
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Benefits of the Ozone Gas Ozone (O3) is a natural gas comprising of three oxygen atoms and is a particularly an unstable fume. Ozone gas is visibly blue in color and has a sturdy odour regularly described as the whiff of air after a springtime electrical thunderstorm. Some people also refer to the odour as like the smell of watermelons. Normal oxygen (O2), which living beings except plants breathe, has dual oxygen atoms and is invisible and odourless. Despite its being a natural gas ozone can be manufactured
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Faster vibration would cause a higher pitch while slower vibration would cause a lower pitch. 7. Explain how different factors affect the speed of sound? Speed of sound depends on factors such as altitude, humidity, and temperature because sound waves need molecules to collide in
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1 MULTIPLE CHOICE QUESTIONS 1. The symbols for sodium, carbon and oxygen… a) S, C and W b) S, C and O c) Na, C and O d) NA, C and O 2. The positive loaded parts in an atom… a) Electrons b) Protons c) Neutrons d) Molecules 3. We define matter as anything… a) That we can feel b) That we can see c) That has mass and takes up space d) That has weight 4. The name for NH3 is… a) Ammonia b) Nitrogen Hydroxide c) Natrium Hydroxide d) Ammonium
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the attractive forces between the positive and negative ions; ionic bonding is regarded as an example of strong bonding. It’s also a bond in which on atom loses an electron to form a positive ion (cation) and the other atom gains an electron in order to have a full outer shell of electrons to make them stable. One atom pulls an electron from another atom.
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(with molecular masses 100,000) 5) Identify polyethylene as an addition polymer and explain the meaning of the term Addition polymerisation: a process in which many identical small molecules combine to form one large molecule, with no by-products. The small molecules are called monomers, while the large molecule is called a polymer. H C C H H H C H C H n H H n In addition polymerisation, no other products are formed. 6) Outline the
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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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Learning/Attainment 4 4 4 5 5 5 2 Summary of Content 2.1 2.2 AS Units A2 Units 6 6 7 3 Unit Content 3.1 3.2 3.3 3.4 3.5 3.6 AS Unit F321: Atoms, Bonds and Groups AS Unit F322: Chains, Energy and Resources AS Unit F323: Practical Skills in Chemistry 1 A2 Unit F324: Rings, Polymers and Analysis A2 Unit F325: Equilibria, Energetics and Elements A2 Unit F326: Practical Skills in Chemistry 2 8 8 20 38 40 51 62 4 Schemes of Assessment 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 AS GCE Scheme of
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