Using colorimetry to find the order of a reaction introduction Coloured solutions absorb some of the wavelengths in the visible region of the electromagnetic spectrum. A colorimeter can be used to measure the amount of light absorbed by a solution (the absorbance) and this is proportional to the concentration of the coloured species present. In this experiment you will use a colorimeter to investigate the reaction between bromine and methanoic acid:- Br2 (aq) + HCOOH (aq) ↓ 2Br-
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Determine the oxidation number of the elements in each of the following compounds: a. H2CO3 H: +1‚ O: -2‚ C: +4 b. N2 N: 0 c. Zn(OH)42- Zn: 2+‚ H: +1‚ O: -2 d. NO2- N: +3‚ O: -2 e. LiH Li: +1‚ H: -1 f. Fe3O4 Fe: +8/3‚ O: -2 Identify the species being oxidized and reduced in each of the following reactions: a. 2 Cr+ + Sn4+ Cr3+ + Sn2+ Cr+: oxidized‚ Sn4+: reduced b. 3 Hg2+ + 2 Fe (s) 3 Hg2 + 2 Fe3+ Hg2+: reduced‚ Fe: oxidized c. 2 As (s) + 3 Cl2 (g)
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Effective leaders try to make people feel that they are part of the decision makers. 词汇： team collaboration dictatorship Some maintain that achieve the goal realize their value the effectiveness of the organization omniscient In a word the decision-making process 例子： This point is especially explicit in the science area. Newton in the ancient times was able to discover the existence of gravity by an apple on his own. However‚ how could it possibly for Steven Jobs to invent Apple-series
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Topic 5 – Bonding and Structure Revision Notes 1) Introduction • Atoms form bonds to get a full outer shell of electrons • There are three types of bonding: ionic‚ covalent and metallic • The structures produced by forming bonds are either giant or simple • The possible combinations of structure and bonding are giant ionic‚ simple covalent‚ giant covalent and giant metallic • Simple covalent is sometimes called simple molecular • Giant covalent is sometimes called giant
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The members in our group were Whitney‚ myself‚ and Charlotte. The title of this lab was “reaction types.” The purpose of this lab was to identify the reaction type‚ balance equations‚ and observe the reactions .Our hypothesis was if there was many stations with fire‚ then they’re would be many combustion reactions. The procedure of the first lab was to place a solid piece of magnesium metal in the bottom of the smallest tube. Place this test tube in the test tube holder. Using tongs pick up the
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Q-3. * Because the perfumed incense is in solid state and by lighting of it‚ it changes from solid state to gaseous state the moment it turns in to gaseous state and gases have a property to spread in all directions. After lightening the incense the molecules of perfume are in a gaseous state and mixing with the molecules of air in the room. All of them undergo random motion at all times as a result of the internal ("heat") energy that they have absorbed. The molecules often bump into each other
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Enzymes Research Enzyme optimum temperature The graph on the left compares enzymes activity with the temperature the enzymes are in. The optimum temperature for enzymes is 40 degrees but anywhere above that temperature the enzymes activity rapidly decreases because the enzymes denatures. Enzyme optimum pH This graph compares
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Product Proposal I. Calamansi Jam Calamansi Jam is a fruit spread made from pure and natural calamansi extracts and sugar. It is very nutritious and contains Vitamin C that can be of great help to our immune system. This product is delicious and at the same time good for our health. II. Related Product Introduction Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin‚ and contains essential nutrients
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It is ‘thiazolidine-2‚4-dione’ and not thiohydantoins as the reaction product of monosubstituted thioureas and chloroacetylchloride a a a a a The reaction products of monosubstituted phenylthioureas with chloroacetylchloride in a polyethylene glycol (PEG-400) medium and K2 CO3 as base/catalyst at an elevated temperature are exclusively thiazolidine-2‚4-diones and not thiohydantoins as has been reported. The core unit thiazolidine-2‚4-dione is essentially derived from chloroacetylchloride
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Chemistry‚ 2014 UNIT 1 – MATTER TRENDS AND CHEMICAL BONDING History of the atom DEMOCRITUS Smallest particle of matter is called an atom Atoms are in constant motion and have empty space between them ARISTOTLE 4 element theory of matter (earth‚ air‚ water‚ fire) Had different combinations of the 4 qualities: hot‚ cold‚ dry‚ moist JOHN DALTON Expanded on Democritus’s theory: All matter is composed of tiny‚ indivisible particles All atoms of an element have identical properties
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