cliques. Nearly every high school girl dresses like a supermodel. They purchase tight fitting jeans with oversized belts and a matching shirt from stores like Abercrombie and Fitch‚ Guess‚ and American Eagle. Not to mention all the matching jewelry or "bling". Boys‚ too‚ are caught in a similar trap. They also dress to impress when purchasing a polo shirt or baggy jeans from Polo‚ Gap‚ or Structure. The media influences all of these styles. Magazines‚ television shows‚ and especially MTV‚ influence teens
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packaging styles‚ all depending on which watch the consumer purchases. Packaging style number one consist of a box lined with leather and suede‚ this is the expensive 18k gold models. The less expensive models come in packaging much smaller without the bling. The third and final model of the Apple Watch is packaged pretty much like Apple’s current IPhone 5 models and above. A basic white box not much larger than long-stem matches. Apple’s eloquent approach to adding gold and suede to its’ packaging of
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e) Hydrophobic and hydrophilic: Hydrophobic avoids water‚ whilst hydrophilic is attracted by it. 2. a) Hydrolysis of maltose: glucose + glucose = maltose + H2O b) The condensation reaction that forms a triglyceride: Glycerol + 3 fatty acids = triglyceride + 3H2O c) Hydrolysis of starch to remove a single molecule: Starch + H2O = 3 glucose 3. The transparency of water is important to life because it allows organisms living in water to absorb the sunlight and carry out photosynthesis
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= 7 Autodissociation: H2O (( H3O+ + OH- K = [H3O+][OH-]/[H2O] -log[H3O+] = 7 [H3O+] = 10-7 M = [OH-] [H2O] = 55.56 M K = 1.8 x 10-16 ; pKa = 15.74 pKa is the acid dissociation constant; low pKa (strong acid‚ high pKa (weak acid we can also write Kw = [H3O+][OH-] Kw = 10-14 In water‚ pH + pOH = 14 pH scale Strong Acids: Complete dissociation of the acid in water: HA ( H+ + A- note: H+ in H2O is hydrated (H3O+) K (Ka
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B) Site of synthesis: 1- In pancreas: Synthesis of taurine in the mammalian pancreas occurs through the cysteine sulfinic acid pathway. First‚ in this pathway is oxidation of cysteine sulfahydryl group to sulfonic acid‚ this oxidation is catalyzed by the enzyme cysteine dioxygenase. In turn‚ cysteine sulfonic acid is decarboxylated to hypotaurine by sulfonoalanine decarboxylase. It is not well known whether hypotaurine is then enzymatically or spontaneously oxidized to taurine. 2- in CNS: Biosynthesis
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2 Cr(OH)3 + 3 Br2 2 CrO42- + 8 H2O + 6 Br- b. O2 + Sb H2O2 + SbO2- in basic solution 2 OH- + 2 Sb + 3 O2 + 2 H2O 2 SbO2- + 3 H2O2 c. HCOOH + MnO4- CO2 + Mn2+ in acidic solution 6 H+ + 2 MnO4- + 5 HCOOH 2 Mn2+ + 8 H2O + 5 CO2 d. ClO2- ClO2 + Cl- in acidic solution 5 ClO2- + 4 H+ 4 ClO2 + Cl- + 2 H2O Write the balanced half reactions of the following reactions: a. NiO2 + 2 H2O + Fe Ni(OH)2 + Fe(OH)2 in basic solution 2 H2O + NiO2 + 2 e- Ni(OH)2 + 2 OH-
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lone pair of electrons can thus behave as a base: NH3 + H+ == NH4+ OH- + H+ == H2O 2. Conjugate acid-base pairs Since all the above reactions are reversible‚ the species formed when an acid gives up a proton can accept a proton and thus behave as a base. The species formed when a base accepts a proton can give up a proton and behave as an acid: Cl- + H+ == HCl HSO4- + H+ == H2SO4 NH4+ == NH3 + H+ H2O == H+ + OH- Acids and bases thus come in pairs; every acid can lose a proton to
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reaction is negative heat of solution. Heat of solution was found by using the formula qsolution = mCsΔT (m= mass; Cs= 4.184 J/g°C; and ΔT = change in temperature). The enthalpy change was found by dividing the heat of reaction by the number of moles of H2O formed. Procedure: Experiment 1 was performed after getting a coffee cup calorimeter. A graduated cylinder was used to obtain 50 mL of 0.862M HCl. It was added to the empty coffee cup calorimeter‚ and its initial temperature was obtained by using the
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2 Al(s) + 2 KOH(aq) + 6 H2O(l) 2 KAI(OH)4(aq) + 3 H2(g) The limiting reagent in this reaction is aluminum since we are producing “alum” crystals. The excess reagent is KOH. This excess is necessary to help accelerate the reaction‚ therefore guaranteeing a maximum yield of crystals Then‚ after sulfuric acid has been added‚ a number of reactions will occur: The excess of potassium will be neutralized releasing heat‚ 2 KOH(aq) + H2SO4(aq) K2SO4(aq) + 2 H2O(l) and aluminate ions will
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of Reaction = Δ(Product) Δ(Time) http://www.one-school.net/notes.html Rate of Reaction = 1 Δ(Product) Δ(Time) ONE-SCHOOL.NET Chemical Reaction Precipitation of Sulphur 2HCl(aq) + Na2S2O3(aq) ⎯→ 2NaCl(aq) + S(s) + SO2(g) + H2O(l) Na2S2O3: Sodium thiosulphate Notes: 1. Yellow precipitate (sulphur) is formed. 2. The reaction is slow. Potassium Dichromate (VI) with Ethanedioic Acid Cr2O72- + 14H+ + 3C2O42- ⎯→ 6CO2 + 7H2O + 2Cr3+ Notes: 1. In the reaction‚ the orange
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