Also known as "benzoate of soda‚" sodium benzoate is an FDA-approved‚ polyunsaturated fat that has been used by food manufacturers for over 80 years to inhibit microbial growth. As a food additive it is used as a preservative‚ effectively killing most yeasts‚ bacteria and fungi. Sodium benzoate is effective only in acidic conditions (pH < 3.6) making its use most prevalent in foods such as preserves‚ salad dressings (vinegar)‚ carbonated drinks (carbonic acid)‚ jams (citric acid)‚ fruit juices (citric
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Investigating the Ratio Between Poly-Vinyl Alcohol and Sodium Borate to form a Bouncing Ball Timothy English Gen. Chem. 1 Lab Section: 009 Introduction: Poly-Vinyl Alcohol (PVA) is a water-soluble synthetic polymer that will be used as one element to form the well know bouncing ball‚ along with Sodium Borate (borax)‚ which has a variety of uses because of its weak base. PVA is ideal for this experiment because it is odorless‚ nontoxic‚ has high tensile strength and flexibility. The
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water as well as the density was calculated. The same process was performed to calculate the density of an unknown substance. The third part Section C 5-25% of sodium chloride was prepared by the instructor. For each percent concentration of sodium chloride a 25 mL was prepared. Weighing the graduated cylinder before and after the sodium chloride was transferred the density were calculation. Pre- Laboratory Questions: 1. A metal sphere weighing 15.45 g is added to 21.27 mL of water in a graduated
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chemical reactions Introduction: The aqueous solution of potassium peroxydisulphate can oxidize potassium iodide as follow: Equation: K S 0 (aq) + 2KI (aq)->2K S0 (aq)+I (aq) 2 2 8 2 4 2 KI(aq) +I (aq) -> KI (aq) 2 3 _________________________________________________ K S 0 (aq) +3KI(aq) -> 2K S0 (aq)+ KI (aq) 2 2 8 2 4 2 The rate law of this reaction can be represented as follow: Rate=k[S208 2-]^a [I-]^b When the concentration of peroxydisulphate ions is fixed‚ the order of reaction with respect
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Sodium borohydride Reduction of Benzil Introduction: The Purpose of this experiment is for the students to learn how to use sodium borohydride to reduce benzil to its secondary alcohol product via reduction reaction. This two-step reaction reduces aldehydes by hydrides to primary alcohols‚ and ketones to secondary alcohols. In order for the reaction to occur and to better control the stereochemistry and yield of the product‚ the metal hydride nucleophile of the reducing agents such as LiH‚ LiAlH4
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Hello everybody! My name is (be) Stewie and this ....is...(be) my family. My mother’s name ..is.....(be) Louis. She .....is..(be) a housewife and she ...is....(be) 35 years old. She ......gets up....(get up) at 7o’clock every morning and ..........prepares......(prepare) breakfast. She...cleans.........(clean) our house and ....feeds........(feed) our dog. She ....coocks.......(cook) well. She .........likes....(like) listening to the radio and watching soap operas on TV‚ but she ....doesn´t like
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Astronomical Clock “Tick tock‚ tick tock” is a common sound from today’s clocks. When traveling in Prague in the Czech Republic‚ the normal everyday clock is not to be found in front of “the Old Town Hall.” Instead‚ the Prague Astronomical Clock overshadows all other clocks with its magnificent craftsmanship. The delicate clock is filled with different mechanics that make it work‚ along with legends and stories to come along with it‚ and the many different times it tells. Normal clock mechanics
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Kinetics Kinetics 6.1 Rates of reaction 6.2 Collision theory 6 16.1 Rate Expression (AHL) 16.2 Reaction mechanism (AHL) 16.3 Activation energy (AHL) 6.1 Rates of reaction 6.1.1 Define the term rate of reaction. 6.1.2 Describe suitable experimental procedures for measuring rates of reactions. 6.1.3 Analyse data from rate experiments. © IBO 2007 Figure 601 An explosion is a quick reaction D ifferent chemical reactions occur at different rates (i.e. speeds)
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Death is an unavoidable occurrence in life‚ but the forms vary in the way that people may describe a death or may be a feeling of what might feel like death. Both W.H. Auden who wrote the poem Stop all the Clocks and Gwen Harwood who wrote the poem Barn Owl have both shown the idea of death in their poems. In the first part of the poem Barn Owl a child at a rebellious age‚ experiments with the constraints of authority in an attempt to seek control for herself‚ as the child sneaks out to kill a
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into the movie to make it well done on so many scales. There are lots of forms of film elements used and shown throughout the movie‚ but one particular symbol focuses on is the use of clocks and how it helps shape the movie and the idea Chbosky is trying to get across. The scenes throughout the movie subtly have clocks placed and certain times being announced in the film to insure the idea that although time may seem to drag on forever‚ time also goes by extremely fast. For Charlie‚ the main character
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