Fluorine is a yellowish green gas at room temperature, Chlorine is Greenish yellow gas, Bromine is a dark red liquid that is volatile and give off a dark red-brown vapour , and iodine is a shiny grey solid. Iodine sublimes when heated gently, this means that it goes straight from solid to purple vapour. The Halogens have an Electronegative
Molecular, Ionic and Net Ionic Equations 1. Strontium compounds are often used in flares because their flame color is bright red. One industrial process to produce low-solubility strontium compounds (that are less affected by getting wet) involves the reaction of aqueous solutions of strontium nitrate and sodium carbonate. Write the balanced molecular equation, the total ionic equation, and the net ionic equation for this reaction. 2.
What are the identities of the substances found after electrolysis and heating? The identities of the substances found were Iodine, Iodide ion (I-), Triodide ion(I3-), Zinc metal and Zinc ion(Zn2+) Post Lab questions: 1. What did this experiment convincingly show about the composition of the white solid? I put that the experiment showed us the white substance was comprised of Zinc ions and iodide ions, and that the two ions and be separated back into their respective elements 2. During the electrolysis, a gray solid formed on the negative wire of the battery and the dark red solution formed at the positive wire of the batter.
Fluorine is a corrosive pale yellow gas. It is highly reactive, participating in reactions with virtually all-organic and inorganic substances. Fluorine is the most electronegative element. Metals, glass, ceramics, carbon, and water will burn with a bright flame in fluorine. It is possible that fluorine can substitute for hydrogen in organic reactions.
Multiple resonance is created from the movement of electrons. The hydrogen atom which is released reacts with HSO4 to make sulphuric acid H2SO4 which is known to be used as a catalyst. The mechanism is as follows: [pic] Health and safety: |Chemical Name |Oxidising |Flammable |Toxic |Harmful |Corrosive |Irritant |Carcinogenic | |Sulphuric acid | | | | | | | | |Methyl Benzoate | | | | | | | | |Methanol | | | | | | | | |Nitric Acid | | | | | | | | You will be using very harmful drugs so before starting make sure te
Combustion of organic compounds can result in detrimental impacts on the environment such as the generation of acids and production of carbon monoxide, particulates and soot. When organic compounds that contain sulphur, nitrogen are combusted, the reaction may produce gases such as sulphur dioxide, nitrogen dioxide and carbon dioxide. When these compounds react with water molecules, it will produce acids which fall as acid rain.Acids dissolve calcium carbonate, meaning that monuments made from marble and limestones are particularly vulnerable. In environmental terms, acid rain flows into water bodies. Acid rain releases aluminium from the soils into the water, an element which is highly toxic to many species of aquatic organisms.
Why? The reaction in Test 2 was defiantly a chemical change, because it started with two powders and as you kept mixed the energy/temperature changed quickly to cold and the odor was very strong like ammonia and as it was chemically changing. It turned into this milky substance that was ice cold. 6. Was the reaction in Test 3 a physical or chemical change?
Halides Lab: Background information: Halide ions are reactive and useful. Salts are positively charged ions (metals) combined with any negative ions (nonmetal), and when placed in a solution (water) it separates into the cations and anions that made it up. The Purpose of this lab is to find out how the Halides react with the indicators, and to determine the identity of the two unknown solutions (A and B). Color of solutions prior to experiment: NaF | NaCI | KBr | KI | Unknown A | Unknown B | clear | clear | clear | clear | clear | clear | Color of indicator prior to experiment: 5% Bleach (NaOCI) | 0.2 M Na2S2O3 | 0.1 M AgNO3 | 0.5 M Ca(NO3)2 | clear | clear | clear | clear | Halide solutions | NaF | NaCI | KBr | KI | unknown A | unknown B | Test 1: Ca(NO3)2 | Cloudy White (Nothing) | Clear | Nothing | light yellow (Nothing) | Nothing | Nothing | Test 2, Part A: AgNO3 | clear (Nothing) | Milky White | Gold (Cloudy yellow) | milky green (Cloudy yellow) | turned white, film developed on top layer | Milky | Test 2, Part B: add Na2S2O3 to test tube from part A | Dark Orange/brown | Clear | Dark Gold(precipitate yellow then clear) | milky green (no change) | white precipitation, settled on bottom | Milky | Test 3: NaOCI (Bleach) | Clear (Nothing) | Nothing | Nothing | Orange (Clear) | Nothing | Orange | Unknown A is identified as NaCI (Sodium Chloride), because in test#1 the solution turned a cloudy white color when Ca(NO3)2 (Calcium nitrate) was added. In the first part of test#2, when AgNO3 (Silver nitrate) is added, the solution turned white, with a thin layer of film developing on the surface.
1.3 Organosilane [66] Monomeric silicon chemicals are known as silanes and any chemical that contains at least one carbon-silicon bond is known as an organosilane. Generally, organosilanes contain three key elements beside silicon; X represents for an organic moiety that is non-hydrolysable which can be either reactive or non-reactive depending on its type. OR\ is a hydrolysable group such as alkoxy or an acetoxy is known to be unstable when present with hydroxyl groups. Finally, R is a space moiety, which can be aryl or alkyl chain. Typically, due to the dual reactivity of organosilane, both alkoxy group (OR\) and non-hydrolysable organic moiety (X), it is used to couple inorganic or organic substrates such as minerals, metals or cellulose and polymeric matrices such as rubber, thermoplastic or thermosets to improve its physical properties.
All diisocyanate are liquids or solids in the nature and highly reactive, it undergo reaction across the double bond C=N of the –NCO group. The reactivity of the isocyanates are mainly depends on the electron density of the central carbon atom of the isocyanate, the low electron density of central carbon atom contains compounds are highly reactive means the aromatic diisocyanates are highly reactive than aliphatic because of resonance structures. Therefore, the electrophilic nature of the aromatic diisocyanates can alter through different substituents on aromatic ring like electron withdrawing or donating groups. The reactivity of diisocyanates plays important role to synthesis of polyurethanes because the possibility to form dimers, trimmers and higher oligomers and also possible to form polymers. In addition, the number of cross-linking reactions may be take place, mainly depends on the reaction conditions such as temperature, catalysts, the structure of the alcohols, amines and isocyanates.