Metals and Non-metals Elements are divided mainly into two groups on the basis of physical and chemical properties – Metal and Non-metal. Metals: Part - I Physical Properties of Metals:- Hardness:- Most of the metals are hard‚ except alkali metals‚ such as sodium‚ potassium‚ lithium‚ etc. Sodium‚ potassium‚ lithium etc. are very soft metals‚ these can be cut using knife. Strength:- Most of the metals are strong and have high tensile strength. Because of this big structures are made using metals
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1. Define science – Science is the development of concepts about the natural world ‚ often by using the scientific method 2. Define multicellular organism - are those organisms containing more than one cell‚ and having differentiated cells that perform various functions. 3. Identify the 3 domains of living things. Which domains include one-celled organisms with no nucleus? a) Organized‚ Homeostatic & Reproduce. b) Bacteria & Archaea 4. Modern taxonomists (scientists
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Method – PG 5‚ 6‚ 7 Preliminary – PG 7 Actual experiment and graphs – PG 7+ Chemistry coursework Hypothesis/Aims The aim of the investigation is to see how different concentrations of hydrochloric acid affects the rate at which hydrogen gas is produced when it’s reacted with a strip of magnesium. The rate of reaction is a measure of change that happens in a single unit of time. When a reaction takes place the particles of the reactants collide. The more often the particles collide
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Jet A1 by burning this fuel there are impact on the global warming the researcher investigate what is the problem with fossil fuel (Jet A1). As solve the fuel problem there are several alternatives have tested‚ that some of them are biofuel‚ Liquid Hydrogen‚ Fracking for Natural Gas and scher-Tropsch (F-T) fuels from fossil feedstocks. However to fund out the alternative fuel is sustainable .firstly defined term sustainability. There are numerous definitions for the word sustainable. White (2001‚
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electron in an atom is given by En =………….. a ) -4π2me4n2h2 b ) -2π2me2n2h2 c ) -2π2me4n2h2 d ) 2πme4n2h2 7. The value of Bohr radius for hydrogen atom is…………….. a ) 0.529×10-8 cm b ) 0.529×10-10 cm c ) 0.529×10-6 cm d ) 0.529×10-12 cm 8. The intramoleucklar hydrogen bonding is present
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4.02 chemistry notes Law of Conservation of Mass One of the most important principles of chemistry is the law of conservation of mass. This law states that matter is neither created nor destroyed during an ordinary chemical reaction. In other words‚ all of the atoms that were present at the beginning of a reaction are present at the end of the reaction—they have just been rearranged to bond differently and form new substances. It is important that chemical equations represent this law by always
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organic matter‚ compost‚ next being 3:2 soil and finally sedentary soil having the lowest pH of them all. The pH of soil pH is affected by both acid and base-forming ions. The acid forming cations are positively charged ions they commonly include hydrogen ions‚ aluminium ions ‚and iron(II and III ions). Base forming cations commonly comprise of calcium ions‚ magnesium ions‚ sodium ions and potassium ions. It is also known that the CEC is positively correlated with soil pH. As the dilution of the soil
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solutions formed due to intermolecular attractions between the solute and the solvent. A1. For Water-Soluble Compounds: Acetone – Water: Hydrogen bonding and van der Waals forces Acetone – Diethyl Ether: Dipole – (induced) dipole and van der Waals forces Sucrose – Water: Hydrogen bonding and van der Waals forces Ethyl alcohol – Water: Hydrogen bonding and van der Waals forces Ethyl alcohol – Dietheyl Ether: Dipole – (induced) dipole and van der Waals forces For Acidic Compounds:
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years six more plants were created on The Coromandel. Cyanide has been used all over the world to make the extraction of gold easier. Although cyanide is helpful in terms of recovering gold it has been used throughout history as a deadly poison. Hydrogen cyanide has been used to disinfect buildings and sodium cyanide was used for over 50 years to control coyote numbers in the US. Cyanide is an ion with a single negative charge formed between carbon and nitrogen. There is a triple bond formed between
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Structural Analysis of Serine Peptidase-Inhibitor Complexes When analyzing these structures‚ we observed a reasonably strong hydrogen bond interaction (distance ~ NVL ≫ AAoF ≈ NVoL. Surprisingly‚ the unmodified AAF compound showed a substantially higher level of activity over the unmodified NVL compound. Initially‚ we hypothesized that the modified compounds (No H-Bond) would be less active. To our surprise‚ both modified compounds‚ AAoF and NVoL‚ showed negligible activity (Figure 16). Additionally
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