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. (a)Correct the following statements. (i) The melting points of crystalline and amorphous solids are not definite. The melting point of an amorphous solid is not definite. OR The melting point of a crystalline solid is definite. P Ps X solute . Ps P Ps The equation for relative lowering of vapour pressure when solute remains normal is X solute P (iii)The degree of ionization decreases with dilution. The degree of ionisation increases with dilution. (iv) Tertiary butyl halide
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|Ruskin Bond | |[pic] | |Ruskin Bond in a Meet the Author program at Sharjah International Book Fair‚ | |23 November 2011 | |Born |19 May 1934 (age 78) | | |Kasauli‚ Solan Himachal Pradesh‚ India | |Occupation
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Chapter 1 Section 1 Anatomy-Study of internal and external structures of the body and the physical relationships among body parts Gross Anatomy -involves the examination of relatively large structures and features usually visible with the unaided eye Microscopic Anatomy-deals with structures that cannot be seen without magnification Physiology-the study of function and considers the functions of the human body Anatomy and physiology are closely interrelated Theroretically Practically Anatomical
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similar number of carbon atoms and physical properties. The uses of the fractions depend on their physical and chemical properties. www.igcse.at.ua Hydrocarbon molecules are only made of a chemical combination of carbon and hydrogen atoms. They are compounds because they consist of atoms of atleast two different elements. THE FRACTIONAL DISTILLATION OF CRUDE OIL www.igcse.at.ua Crude oil is a complex mixture of mainly hydrocarbon compound molecules
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C2H2n+2. All of the bonds are single bonds (-C-H-‚ and -C-C-). The chains can be straight or branched. The smaller members (less than 4 carbons) are gases‚ while larger ones (five to seventeen carbons) are liquids. Beyond seventeen carbons the alkanes are waxy solids. Structure: The simplest saturated acyclic hydrocarbon is methane‚ CH4. The other hydrocarbons belonging to this class can be taken as descendents of methane‚ resulted from the substitution of one or more atoms of hydrogen with hydrocarbon
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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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reaction‚ and an example of where the reaction might be biologically important. Answer: Hydrolysis: Hydrolysis uses water (and various enzymes) to break down molecules into smaller‚ simpler molecules. This occurs by breaking a bond on the reactant and adding a hydrogen atom to one part‚ and a hydroxyl (-OH) to the other. The result is 2 simpler molecules. Macromolecule + Water molecule + molecule This process aids us in controlling blood sugar‚ by the hydrolysis of glycogen to glucose
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Enthalpy changes can be calculated using average bond enthalpy data. i) The enthalpy change to convert methane into gaseous atoms is shown below. [pic] Calculate the average bond enthalpy of a C—H bond in methane. [1] ii) Use the data in the table below and your answer to (a)(i) to calculate the enthalpy change for [pic] [3] [pic] b) The standard enthalpy of formation of 1‚2-dibromoethane‚ CH2BrCH2Br‚ is – 37.8 kJmol-1. Suggest the main reason for
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Exercise – Hydrogen Bond Phase Transition (TRACK 2 ONLY) Writing & Marking Rubric Instructions: 1.Go to Core Study Resources → III Symmetry in Crystals → Downloads and Links. 2.Download the following: a. Yoshida et al.‚ Flexibility of Hydrogen Bond and Lowering of Symmetry in Proton Conductor. Symmetry 4‚ 507 – 516 (2012). b. Writing and Marking Rubric Scaled to 22 Marks Beauty‚ Form and Function: An Exploration of Symmetry Writing Exercise 1. Read Flexibility of Hydrogen Bond and Lowering
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