C1 Revision Notes Atmosphere is a mixture of gases that surrounds the Earth. The three main chemical components present in air are Nitrogen‚ Oxygen and Carbon Dioxide. Trace amounts means only a very tiny concentration of gas is present. An element is made up of 1 type of atom. A compound is made up of 2 or more types of atom that are chemically bonded. A mixture also contains more than 2 or more type of atoms but they cannot be chemically bonded. A pollutant is a waste matter that contaminates
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GDP - Gross Domestic Product is an estimate of the amount of economic activity in an economy and is produced by the Office of National Statistics. Elasticity of demand (Ped) = % change in demand of good X / % change in price of good X • If the PED is greater than one‚ the good is price elastic. Demand is responsive to a change in price. If for example a 15% fall in price leads to a 30% increase in quantity demanded‚ the price elasticity = 2.0 • If the PED is less than one‚ the good is
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RE PHILOSOPHY Miracles - REVISION What constitutes a miracle? A miracle is held to be an act of God‚ or an invisible agent‚ which goes against the laws of nature and has some religious meaning or significance. Definitions of miracles are often very broad and leave them particularly wide to interpretation. We may say that it is a miracle that someone has recovered from a cold‚ but that is only the believer’s interpretation and cannot be verified as miraculous. It simply reflects the way
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Conflict in Vietnam‚ 1963-75 Revision Notes This topic is in Paper 2‚ the source-based exam – along with World War One. There is no choice of question. The paper tests your source skills‚ but you must have a good knowledge of the topic as well - and be able to use this both in your answers and in order to understand the sources properly. Read the advice on the front of your WW1 revision pack for tips on how to answer the exam questions. Part 1; Reasons for the US involvement in
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Islam Revision notes What does Islam teach about good and evil? The problem of evil and suffering is one of the common reasons people give for not believing in God. There are two types of evil: • natural evil - suffering caused by events that have nothing to do with humans‚ and which are to do with the way the world is‚ eg‚ natural disasters such as volcanic eruptions‚ floods or earthquakes • moral (or human) evil - suffering caused by humans acting in a way that is considered morally
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SSA2211 Revision Notes Chapter 2 – In the Beginning – The Lion City 2 different recounts of the birth of Singapore Who / Year How it started When the reign ended Why he left Sejarah Melayu Seri Teri Buana‚ Prince of Palembang / 1299 Decided to stay after he saw the merlion and renamed Temasek as Singapura After 5 generations / 1396 Last king‚ Iskandar Shah betrayed by his official who opened the gates for invading Javanese forces Portuguese recounts Parameswara‚ Prince of Palembang
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Biology End of Year Revision Quick Recap on Graphs: * Always remember to include units * Put the dependent (thing you measure) along the y-axis. (One going up) * Put the independent (thing you change) on the x-axis (along the bottom) * Don’t join the dots up‚ draw a line of best fit. * Circle anomaly result. Healthy Diet For a healthy diet‚ you need energy. So you need: CARBOHYDRATES‚ to release energy. FATS‚ to keep warm and release energy PROTEIN‚ for growth cell
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1.1.1 In small unicellular organisms‚ substances move around slowly by diffusion. Diffusion is too slow to move substances round the larger bodies of multicellular organisms. They have a circulatory system: substances are carried in blood pumped by a heart. In a closed circulatory system (eg in vertebrates) blood is enclosed in narrow blood vessels. This increases efficiency: blood travels faster as a higher pressure is generated. Valves ensure blood flows in one direction:
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The Odyssey: Father-Son Relationships The Odyssey introduces the theme of father-son relationships to exemplify how influential fathers were at the time. Fathers act as role models to their sons and can determine their actions‚ even while being absent from home for long periods of time. Nestor’s son‚ Pisistratus‚ is a respectful and courteous man. His manners could be attributed to King Nestor’s piety. King Nestor offers sacrifices to the gods‚ as seen at the beginning of book IIV‚ when his people
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GEOGRAPHY AS LEVEL REVISION NOTES: Population Change All Definitions: Population structure: the breakdown of a country’s population into groups defined by age and sex. Death Rate: the number of deaths per thousand population per year‚ expressed as deaths per thousand Age specific Death Rate: this shows death rates per thousand population by sex or age groups. Birth Rate: the number of live births per thousand population per year‚ expressed as births per thousand Infant Mortality: a measure
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