Chem 30A Ch.1-4: Condensed Chang’s Class Notes Chapter 1 Valence electrons octet rule exceptions P and S can have 10 or 12 valence e- B and Al (Group 3) can have 6 valence e- electronegativity- how much an atom wants e- < 0.5 = nonpolar‚ covalent (i.e. H2) 0.5 - 1.9 = polar covalent direction of polarity (using arrow and delta symbol) overall dipole > 1.9 = ionic formation of ions fish-hook arrow Lewis structure formal charge Functional Groups Molecular Shape VSEPR (Valence Shell
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LAB 1 POSTLAB REPORT (65 pts) 1. State the objective(s) of the lab. (5 pts) • To analyze the effects of specific liquids on a variety of materials • To observe potential hazards • To investigate the effects of strong bases‚ strong acids‚ acetone and bleach on a variety of materials which include sugar‚ cotton‚ nylon‚ hair‚ polystyrene‚ egg white‚ egg yolk‚ and aluminum foil. 2. Give a summary of your observations for each of the experiments. (24 pts) Sugar + H2SO4 Black clumped substance
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Physical and Chemical Change Objective: Recognize and distinguish between chemical and physical changes. Materials: - lab balance - microspatula - lab burner - dropper pipet - 5 test tubes - mortar and pestle - test tube rack - magnet - test tube holder - insulating pad - watch glass - safety goggles - glass square - lab apron or coat - copper sulfate pentahydrate - iron fillings - sodium chloride - magnesium ribbon - hydrochloric acid - paper
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Practice problems for CHE 101 final Approximate breakdown of points: Old Ch. 2: 10 Ch. 3: 15 Ch. 4: 15 Ch. 5: 15 Ch. 6: 15 Ch. 7: 15 Ch. 10: 15 New Ch. 8: 40 Ch. 9: 40 Ch. 11: 20 Final: May 3 at 11:45 am. Rooms posted on UBlearns Check your points entered on posted grade point totals. Keep all assignments. 1) For the following molecules‚ give the Lewis structures‚ the molecular geometry‚ hybridization‚ and whether the molecule is polar or nonpolar
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Pre Lab: Background: The Density of a material may be determined by determining the mass and volume of a sample material and calculating the mass/volume ratio. An independent variable is the variable that is being manipulated or changed during the experiment. The dependent variable is the variable that is being measured. The independent variable for this experiment is the copper because you are only changing the amount of copper you use. The dependent variable is the density because we are measuring
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Studies show junk foods change brain chemistry and are addictive like cocaine Saturday‚ December 24‚ 2011 by: Ethan A. Huff‚ staff writer (NaturalNews) Is gorging on a bag of nacho cheese-flavored corn chips‚ for instance‚ the same as snorting a line of cocaine? A number of scientific studies‚ many of which were conducted within the past year‚ have found that junk food addiction is essentially the same as cocaine addiction‚ at least as far as the brain is concerned. Bloomberg Businessweek reports
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Revision checklist for IGCSE Chemistry 0620 A guide for Students Revision checklist for IGCSE Chemistry 0620 A guide for students How to use this guide The guide describes what you need to know about your IGSCE Chemistry examination. It will help you to plan your revision programme for the theory examinations and will explain what the examiners are looking for in the answers you write. It can also be used to help you to revise by using tick boxes in Section 3‚ ‘What you need to know’‚ to check
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drinks and the amount of junk food eaten in America. People are wondering if there should be a junk food tax.With a junk food tax the obesity percentage will go down‚ it may not be by a lot but it would be better than it is today. As a result of putting a junk food tax in action‚ therefore the obesity percentage and health cost will go down. Junk food can be known as different types of food‚ candy‚ and even sugary drinks. Some foods that can be considered ‘junk food’ are candies‚ chips‚ gum‚ and
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film‚ in the America‚ one in four Americans visits a fast-food restaurant which makes McDonald’s serves 46 million foods everyday‚ and a person could easily find fast food restaurants within a mile. They found McDonald’s even at the hospital. In the film‚ ‘Super-Size Me’‚ the America is now become fattest country in the world‚ and the medical costs have doubled in the past five years. Also‚ in the another film‚ ‘Reaction of the film Food‚ Inc’‚ people are forcing to teach animals to eat corn even
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Report of Whole Foods Market and its business unit of grocery store locations Date: October 26‚ 2013 To: Subject: Whole Foods Market Inc. Executive Summary The scope of the project is a study of Whole Foods Market and its strategic alignment in the organic/natural food and beverage industry. The following report will explore challenges and opportunities this company faces and recommendation for growth. The scope of our work to prepare this report includes: Reading industry
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