Lecture 12 Chapter 6 6.1 Thermochemistry: Energy & units (p.227) From observation we know‚ that - some chemical reactions begin as soon as the reactants come into contact with each other (precipitation reactions) - some reactions are slow or even so slow at room temperature that even lifetime is not enough to observe a measurable change (rusting of iron‚ tarnishing silver) Also‚ almost all chemical reactions involve exchange of heat (or energy): in combustion reactions
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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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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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Editor’s Note: This occasional series of articles looks at the vital things in our lives and the chemistry they are made of. You are what you eat. But do you recall munching some molybdenum or snacking on selenium? Some 60 chemical elements are found in the body‚ but what all of them are doing there is still unknown. Roughly 96 percent of the mass of the human body is made up of just four elements: oxygen‚ carbon‚ hydrogen and nitrogen‚ with a lot of that in the form of water. The remaining
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Anti-Divorce One of the main things people do when they feel great chemistry between one another is get married. Some couples are unable to maintain their relationship and they get a divorce; which is one of the solutions to solve the problems between husband and wife. Most people think carefully before they get married however the divorce rates are continuously increasing. There are three main causes of divorce: changing in woman’s roles‚ stress in modern living‚ and lack of communication
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1.1 Chemistry A. What Is Chemistry? * Because living and non-living things are made of matter‚ chemistry affects all aspects of life and most natural events. * Matter- is anything that has mass and occupies space. * Chemistry- is the study of the composition of matter and the changes that matter undergoes. B. Areas of Study * Five traditional areas of study are organic chemistry‚ inorganic chemistry‚ biochemistry‚ analytical chemistry‚ and physical chemistry. * Organic
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What are the impacts of chemistry on society? In: Biology [Edit categories] Answer: the impacts chemistry have on a society is huge. every single material that we come in contact with‚ in our daily ife is composed of chemicals there are negative and positive effects of chemistry but the negative effect is mainly due to the inability of a man to think carefully first of all lets take the example of drugs. drugs are composed of chemicals ofcourse‚ but these drugs can be used for a good purpose
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happy dagger‚ / This is thy sheath‚” stabs herself (5.3.171). She dies upon Romeo’s body. The portal of the Juliet toward her parent and her family by saying that she doesn’t want to marry Paris as she had feeling for Romeo and they are madly in love and they get married. Tybalt is Juliet’s cousin‚ i.e. a Capulet. After he kills Romeo’s BFF‚ Mercutio‚ in a street brawl‚ Romeo mortally stabs him‚ which causes Romeo to be banished from Verona. You don’t have to look far for Tybalt’s motivation:
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Concert Report #1 The jazz concert I attended took place in Fullerton College Theater on November 13‚ 2012. The Fullerton College Jazz Big Band and J- Train vocal jazz was very organized and well structured. The first song was the Open Invitation which was performed by the J- Train Vocal Jazz. The song was so interesting because the soloists had great voices. Everyone around seemed interested and amused. The J- train vocal jazz also performed the songs “Nancy McFlannery’s Cannery”‚ and” Fugue in
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