Endothermic

WHAT IS FORMALIN? Formalin is the trade name for an organic compound made by formaldehyde and water. It has the chemical formula CH2O and its chemical structure is as shown in figure.1. Uses: Formaldehyde is used mainly in the production of plastics (such as urea-formaldehyde plastics which is used in many manufacturing processes due to its useful properties such as flexural modulus, and a high heat distortion temperature, high surface hardness, low water absorption, high tensile strength, mold…

 Comment: The three bonds (one solid line, one wedged line and one dashed line) that are attached to the + carbon atom are turned inside out. If the starting material has Br on the right side of the + carbon atom, the final product will have OH on the left side of the + carbon atom and vice versa.  Comment: There is only one hump for the energy profile of an SN2 reaction. As we shall see later, there are two humps for the energy profile of an SN1 reaction. One easy way to…

properties. Heat is also a form of kinetic energy, like sound waves. The more heat present, the faster molecules vibrate as well as the more energy they have. The amount of heat a substance or material intakes (absorbs) is heat absorption. This is an endothermic change because it absorbs the more heat it is exposed to, and heat is a form of energy. However, it can also give off heat which would be an exothermic change. The amount of heat absorption is different for every material, as well…

Once the solution had been heated and stirred, the solution became clear and a black precipitate was present. Since heat was applied to the beaker (energy went into the system), the reaction was classified as endothermic. Decomposition Reaction: Balanced Chemical Equation Cu(OH)_(2 (s))→CuO_((s))+H_2 O_((g)) Reaction 4: The Formation of CuSO4: Reaction 4 involved an acid-base reaction between CuO, the Arrhenius base, and H2SO4, the Arrhenius acid to form the CuSO4…

• The temperature in the room may have altered. A dependent variable is a variable you do not change during an experiment. Instead, it changes as a result of other changes you make. The dependent variables in my experiment were: • The rate of reaction. • The volume of sodium thiosulphate. The volume of sodium thiosulphate will remain unaffected throughout the whole experiment, Where as I will be changing the concentrations of hydrochloric acid. The volume of sodium thiosulphate will…

Animals are thought to be separate from humans. However, they both are in the animal kingdom, and even as mammals they share certain characteristics: they are vertebrates, endothermic, have body hair, and mammary glands. These characteristics are what relates animals to humans. Although, there are various aspects which distinguishes an animal from a human. Humans are self-conscious beings, who have emotions, language, a complex thought process, and philosophical thinking. These are the key…

Research Question How does the change in hydrochloric acid concentration affect the rate of reaction between sodium thiosulfate (Na2S2O3(aq)) and hydrochloric acid (HCL(aq))? Background to the Research question Collision Theory Back in 1916, scientists William Lewis and Max Trautz proposed the collision theory, which qualitatively explains how chemical reactions take place and why reaction rates change for various reactions. Chemical reactions involve collisions amongst reactant particles or…

Throughout history, humans have been clearing land and hunting animals heavily. This has pushed some animals passed their point of coming back, leading to extinction. Some have been pushed very close to the point of extinction, leaving it endangered. In today’s world, there are 16,306 living organisms who are endangered due to numerous reasons, examples being excessively hunted to because their habitat is being destroyed because humans need the lumbar or resources found there…

Solution growth deposition This technique consists essentially of inserting the substrate into a solution containing hydrolysable metal compounds and pulling it out at a constant speed into an atmosphere containing water vapour. In this atmosphere, hydrolysis and condensation takes place. Finally the films are hardened by a high temperature cycle to form transparent metal oxides. Any hydrolysable compound including halides or nitrates but preferably metallo-organics are suitable…

Figure 1 shows the relation between density ρ and molar volume Mv as a function of copper oxide. From this figure, can be observed that the ρ and Mv decreased with the increased of copper oxide content replacement the lead oxide. The decrease of density due to the molecular weight of CuO is lower than the molecular weight of Pb3O4. The decrease of the molar volume due to the decrease the number of oxygen and may be the ionic radius of copper ions less than the ionic radius of lead ions. The…