Purpose: To find out if the Unknown substances are bases or acids. Materials: goggles aprons paper for data table graduated cylinder unknown I substance beakers/test tubes stirring rod litmus paper pH indicator paper pH color chart phenolphthalein scoopula eye-dropper digital pH meter magnesium ribbon calculator unknown II substance forceps sodium bicarbonate Procedures: Test the pH of the Unknown substances with litmus paper and pH indicator paper and match to color chart
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CHEMICAL REACTIONS: ACID-BASE BUFFERS Short Overview Acids and bases represent two of the most common classes of compounds. Many studies have been done on these compounds‚ and their reactions are very important. Perhaps the most important reaction is the one in which an acid and base are combined‚ resulting in the formation of water (in aqueous solution) and a salt; this reaction is called neutralization. A buffer solution is a solution that contains both an acid and a salt
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for further guidelines. 1) “The Lost Entry” – For this paper‚ you will create a four or five line entry to Columbus’s travel journal. This entry must be accompanied by a paper of one to one and a half pages that uses Columbus’s actual letter as evidence to explain why you wrote the entry as you did. (Be sure to have an argument for this paper as you would for the other paper options. A thesis for this paper could be similar to the following: The journal entry I have created fits with the writings
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Digital evidence refers to any piece of electronic information that can be found or retrieve from any electronic device which can be used to provide evidence for any use of violation. Basically‚ “Any information of probative value that is saved or stored in a binary form is digital evidence.” (SWGDE‚ 1998‚ p5). Below are the lists of electronic devices that stores digital evidence and some of the possible ways that the information can be manipulated: Information stored inside mobile phones such
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Acid and Base Titrations: Preparing Standardized Solutions Introduction: This experiment focuses on titrations of acids and bases. A titration depends on addition of a known volume of solution and is a type of volumetric analysis. Many titrations involve either acid-base reactions or oxidation-reduction reactions. In this experiment we do one of each. We monitor the pH of the reaction with the use of a color indicator. We also learn about the standardization of bases (NaOH) and acids (HCl) which
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Assignment: Law of Evidence Question 1 The law of evidence aims to determine what material may be presented in court as evidence‚ by whom‚ in what manner and its probative value. Question 2 The onus of proof lies with the State to prove that the accused is guilty. Question 3 Real evidence is evidence in the form of objects or exhibits such as the murder weapon. Documentary evidence is evidence in the form of written documentary such as letters and contracts. Question 4 Evidential
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can reduce the cost of lawsuit to make this self driving car it can reduce the cost of user suit car because the car is not only designed to detect problems is run UL but it is also able to detect if there is a roadblock. In addition this car also has the characteristics of a specific security. each user that has the car automatically need to wear safety plate strap. in other words‚ If every car "fitted" into the grid and driving alone‚ then speeding‚ along with stops and red light running will
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Acid-Base Calculations The Ion-Product Constant for Water‚ Kw Water undergoes ionization to a small extent: H20(l) H+(aq) + OH–(aq) The equilibrium constant for the reaction is the ion-product constant for water Kw: (1) This is a key equation in acid-base chemistry. Note that the product of [H+] and [OH–] is a constant at a given temperature (Eq(1) value is for 25oC). Thus as the hydrogen ion concentration of a solution increases‚ the hydroxide ion concentration decreases
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PHYSICAL EVIDENCE MANUAL OREGON STATE POLICE FORENSIC SERVICES DIVISION Preference The purpose of this handbook is to educate our customer in the Criminal Justice System regarding the services provided by the Oregon State Police Forensic Services Division‚ and the recommended methods of documenting‚ collecting and preserving physical to ensure the best analysis results. The value of properly collected physical evidence followed by examination and interpretation by the forensic laboratory
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Review Sheet Exercise 10 Acid/Base Balance NAME 1. Match each of the definitions in Column A with the appropriate description in Column B. Column A Column B F 1. pH E 2. acid D 3. base A 4. acidosis B 5. alkalosis C 6. carbon dioxide a. condition in which the human body’s pH levels fall below 7.35 b. condition in which the human body’s pH levels rise above 7.45 c. mixes with water in the blood to form
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