Cl2− | | | | | * Question 6 10 out of 10 points | | | How many O atoms are there in 51.4 g CaSO4?Answer | | | | | Selected Answer: | 9.09 × 1023 | | | | | * Question 7 10 out of 10 points | | | How many covalent bonds will a nitrogen atom usually form?Answer | | | | | Selected Answer: | 3 | | | | | * Question 8 10 out of 10 points | | | How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl
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neutral and positive particles An atom is composed of a nucleus complaining protons and neutrons Writing and balancing chemical equations 1. Check for diatomic gases and place the subscript 2 (N‚ O‚ F‚ Cl‚ Br‚ I‚ H) 2. Balance formulas of compounds and place c 3. Conservation of atoms (both sides should have equal # of ions of each element) 4. Law of conservation of mass (both sides should have equal mass) Isotopes 2 or more forms of the same element that differ in their mass number because
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Edexel IGCSE Chemistry Revision Notes IGCSE Chemistry Triple Award Revision Guide Topic Introduction to chemistry Atomic Structure Structure and Bonding – Ionic Bonding Structure and Bonding – Covalent and Metallic Bonding Organic Chemistry - Alkanes Organic Chemistry – Alkenes / Addition Polymerisation Organic Chemistry – Alcohols / Condensation Polymerisation Calculations Periodic Table Reactivity Series and Metal Extraction Electrolysis Energetics Acids‚ Bases‚ Salts and Neutralisation
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TextBooks Sr No T-1 T-2 Title Engineering Chemistry Chemistry Reference Books Sr No R-1 Other Reading Sr No OR-1 OR-2 OR-3 OR-4 OR-5 OR-6 OR-7 Journals articles as Compulsary reading (specific articles‚ complete reference) http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4601 ‚ http://www.springer.com/chemistry/electrochemistry/journal/10800 ‚ http://www.sciencedirect.com/science/journal/13882481 ‚ http://www.springerlink.com/content/100224/ ‚ http://www.sciencedirect.com/science/journal/00108545
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matter‚ substances‚ mixtures‚ elements‚ compounds‚ homogenous mixture‚ heterogeneous mixture and solutions. -Matter: anything that takes up space and has mass. -Substances: a sample of matter having a uniform and definite composition. Elements/Compounds. -Mixtures: a combination of 2 or more substances that are not chemically combined. -Elements: a substance that cannot be changed into a simpler substance under normal laboratory conditions. -Compounds: a substance that can be broken down to
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know to be bacteria and blood cells. Leeuwenhoek shared the designs of his microscope‚ as well as his observations‚ with the scientific community. * Around 1655 the English scientist Robert Hooke used van Leeuwenhoek’s ideas and made the first compound light microscope‚ which used more than one lens to magnify an object. He examined thin slices of cork‚ a dead plant material‚ and saw that the cork was made up of thousands of empty chambers. Hooke named these small chambers "cells" after the rows
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Year 11 Module 1 – The Chemical Earth The Earth is made up of a large number of different substances: elements‚ compounds & mixtures We can classify elements & compounds as pure substances. These are always HOMOGENEOUS. Mixtures are not pure substances and can be either homogeneous or HETEROGENEOUS. Pure substances have a fixed composition eg copper metal‚ sulfur‚ carbon dioxide (CO2)‚ methane (CH4). Mixtures have variable composition and can also be separated into its components relatively
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Subject Content Most of the objectives specified in this section relate to Knowledge with Understanding‚ although some indication has been given as to where the skills of Handling Information and Solving Problems may be developed. Teachers are reminded that‚ in the written papers‚ 40% of the marks are allocated to these higher ’thinking’ skills. In almost every section‚ students should therefore be given practice at dealing with unfamiliar situations so that these higher thinking skills can be developed
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nonelectrolytes. Also electrolytes can be strong or weak. Under strong electrolytes we have NaCl and CaCl2 which are ionic compounds‚ HCI‚ HNO3‚ HBr and H2SO4 are under acids and NaOH‚ KOH‚ and LiOH are under bases. Weak electrolytes are ionic compounds and slightly soluble such as CH3COOH‚ under acids we have HF‚ H2CO3‚ H2SO3‚ and NH3.While nonelectrolytes are nonpolar covalent compounds such as O2 and H2O‚ and under acids we have CS2‚ CCI4‚ C6H6‚ and C2H12O6. Figure 9.17 Electrical Conductivity of
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and atoms‚ molecules‚ elements‚ and compounds may seem a bit overwhelming. The good news: Your Chem I class doesn’t have to be torture. This handy Cheat Sheet provides some basic information you can refer to regularly to make your chemistry class just a tiny bit easier. Chemical Bonding Basics In bonding‚ atoms lose‚ gain‚ or share electrons in order to have the same number of electrons as the noble gas that’s nearest on the periodic table. Ionic‚ covalent‚ and metallic bonds are formed by combinations
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