chemical equations in terms of chemical amount (in moles) (2.3) Convert between chemical amount and mass (2.4) Classify chemical reactions (2.5‚ 2.6) Predict the solubility of elements and ionic and molecular compounds in water (2.6) Predict products for chemical reactions (2.5‚ 2.6) Memorized molecular compounds pg. 34 Sample Questions: Chapter One Review pg. 40 #11-19‚ 25 Chapter Two Review pg. 66 #5-7‚ 9 Unit Review pg. 68 #1-8‚ 11-25
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structure is from the metallic oxides containing giant structures of ions on the left of the period via a giant covalent oxide (silicon dioxide) in the middle to molecular oxides on the right. Melting and boiling points The giant structures (the metal oxides and silicon dioxide) will have high melting and boiling points because a lot of energy is needed to break the strong bonds (ionic or covalent) operating in three dimensions. The oxides of phosphorus‚ sulphur and chlorine consist of individual molecules
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Practice Exam Chapter 8 I have put the questions we may not get to for this exam at the end of the practice exam) 1. How many lone pairs of electrons are assigned to the sulfur atom in H2S? a) 0 b) 1 c) 2 d) 3 e) 4 2. Which of the following is a correct Lewis structure for nitrous acid‚ HNO2? 3. The central atom in PH3 is surrounded by a) three single bonds and no lone pairs of electrons. b) three single bonds and one lone pair of electrons. c) three single bonds and two lone
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IGCSE Complete Chemistry Notes Unit 1: States of matter Everything is made of particles. Particles in solid are not free to move around. Liquids and gases can. As particles move they collide with each other and bounce off in all directions. This is called random motion. In 2 substances‚ when mixed‚ particles bounce off in all directions when they collide. This mixing process is called diffusion. It’s also the movement of particles without a force. The smallest particle
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Xxx.comTheories of light In the seventeenth century two rival theories of the nature of light were proposed‚ the wave theory and the corpuscular theory. The Dutch astronomer Huygens (1629-1695) proposed a wave theory of light. He believed that light was a longitudinal wave‚ and that this wave was propagated through a material called the ’aether’. Since light can pass through a vacuum and travels very fast Huygens had to propose some rather strange properties for the aether: for example; it must
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solids. Potassium chloride‚ sodium nitrate etc are some of the compounds‚ which are crystalline. Amorphous solids: Solids with particles not arranged in a regular fashion. They have only short range order or even the particles are disordered in some cases. Amorphous solids are isotropic in nature. Crystalline solids can be further classified depending on the nature of the bonding as: 1. Ionic 2. Molecular 3. Covalent 4. Metallic Classification of Crystalline solids: S
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What You Need To Know for the Chemistry Regents Exam The Test The Chemisty Regents Exam is broken down into three sections: Part A: 35 mulitple choice questions from all units covered over the course of the school year. Part B: Approximately 25 questions‚ with a mix of short answer and multiple choice. Questions focus on the Reference Tables‚ graphing‚ and laboratory experiments. Part C: Approximately 15 short answer questions‚ most broken down into smaller parts. This is often an
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microscope • Compound light microscopes – allow light to pass through the specimen and use two lenses to form an image. • Electron microscope- use beams of electrons‚ rather than light‚ to produce images. • Transmission electron microscope (TEMs) shine a beam of electrons through a thin specimen. • Scanning electron microscopes (SEMs) scan a narrow beam of electrons back and forth across the surface of a specimen. 2.1 • • Most elements are found combined with other elements in compound. • A chemical
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fluorine. These are also called heteroatoms. The heteroatoms have a partial negative charge while hydrogen has a partial positive charge. Hydrogen bonding is generally stronger than most bonds bar covalent bonds. Water: Bonding within water molecules occur between oxygen and hydrogen. These covalent bonds mean that the electrons are shared between the oxygen and hydrogen atoms to create a complete valence shell. However‚ electrons tend to spend more time around the oxygen atom due to its higher
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1. What is Chemistry? The study of the composition‚ structure‚ and properties of matter. The processes that matter undergoes and the energy changes that accompany these processes. 2. What is the formula for density? If I give you the density of a substance and the volume‚ you should be able to tell me the mass… Density = Mass/Volume 3. Compare and contrast intensive and extensive properties. Give an example of each. Extensive properties depend on the amount of matter that is present. Such
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