what is the definition of replacement reaction? -chemistry related?
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using letters to represent the general situation for a replacement reaction you'd get:\n\nA  + B-C react to produce B + A-C. In other words molecule A was by itself in the beginning but it replaced B to form a new molecule and molecule B ends up by itself.
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If you meant chemical recovery it is something like this\n\nWhen we use a particular chemical for a chemical reation(eg purifying water) the chemical eventually gets converted to other chemicals due to reaction.\nNow treating this new product with other reagents to get the first chemical bak is called recovery
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energy input: reaction requires energy to take place - endothermic\nenergy output: reaction gives off energy when it takes place - exothermic
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The guy who answered before was right but i wanna explain it. An exothermice reaction is one in which heat energy is lost to the surroundings, thus at the end of the reaction, some heat would have been lost. For heat to have been lost, the product has to have lesser heat than the reactant.Take not that heat here is the same as Enthalphy.\nSince the Enthalphy heat value = heat of product-heat of reation = a negative number because heat of product is lesser.\nthus the answer is i nd ii\n\n2. To calculate the heat absorbed or evolved in a system, the formulais Q(quantity of heat) = m*c*T, where m is the mass, c is the specific heat capacity, and T is the change in temperature, thuis this three are neede. Density is not important in this calculation\nso the answwers are i and iii
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oxidation \n\nAny chemical reaction in which a material gives up electrons, as when the material combines with oxygen. Burning is an example of rapid oxidation; rusting is an example of slow oxidation. (See combustion and reduction.)
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A Redox reaction is a reaction where one reactant loses electrons and another gains. The Reduction part or half-reaction is the reactant gaining electrons. The Oxidation part or half-reaction is the reactant losing electrons. I always remember that reduction is a gain because the oxidation number is reduced, not the number of electrons.
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Energy\n\nA chemical reaction simply supplies energy to the system
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Chemistry is about two substances which could react and the resultant does not possess all or some the qualities of the initial substance thus forming a completely a new substance.  Therefore each substance that reacts is a special one, known as an 'element' having a characteristics of its own.  Diffrent elements react among themselves in chemical reaction.\nVR
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decrease\nthe greater the surface area of the reactant the more it is exposed to its other reactant, and more of it can react,  thus the reaction rate increases. This is the opposite for a decrease in the surface area.
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reactant(s)\nSynthetic
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Ok, now first you must know that 'free radicals' are species with a unpaired electron(resulting from homolytic and heterolytic fission), which makes them very unstable and reactive.\nWhen you term a reaction as 'free radical substitution', it means an atom-or group of atoms-in a molecule is being replaced by a free radical.\n\nConsider the reaction between methane (CH4) and Chlorine (Cl): The Cl-Cl bond breaks, resulting in free radicals of Cl- ions; one of the H atoms in CH4 is then replaced by a Cl- ion, hence forming CH3Cl and HCl. Since the free radical Cl- has replaced the H atom, this reaction is termed a free radical substitution reaction.\n\nCH4 + Cl2 ----> CH3Cl + HCl
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Simply:\n\nyes\nyes\nyes\nyes\nand yes\n\nThey are all single replacement.\n\nGood job---Get an "A".\n\nI use this: \nA synthesis is an element + an element = one compound.\nA decomposition is one compound = an element + and element (synthesis backwards)\nA singe replacement has an element + a compound = an element + a compound.\nA double replacement  has compound + compound = compound + compound.
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I believe it was catalase.  It comes from the term to catalyse which means to speed up or destroy.  Calalyses are not used up in chemical reactions just like enzymes.
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understanding the reaction meachanism \neffect of catalysts etc....\ndetermining the amounts needed
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It is a nucleophilic substitution reaction, where the nucleophile -OH from KOH replaces -Cl from 1-chlorobutane; this forms KCl and 1-butanol as products.\n\nKOH + CH3-CH2-CH2-CH2Cl ---> KCl + CH3-CH2-CH2-CH2OH
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d) Reducing agent. Oxidation is the loss of electrons. The substance getting oxidized donates the electrons to the subnstance getting reduced. For that reason, a) Electron donor is also correct.\n\nI don't know if you're allowed more than one answer to this question. It may be that the teacher did not see that the reducing agent was an electron donor, and thought of electron donation in the Lewis base sense, which does not come up in this question.
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A chemical reaction is material changing from a beginning mass to a resulting substance. The hallmark of a chemical reaction is that new material or materials are made, along with the disappearance of the mass that changed to make the new. This does not mean that new elements have been made. In order to make new elements, the nuclear contents must change. There are magnitudes of difference in the amounts of energy in ordinary chemical reactions compared to nuclear reactions, the rearrangement of the nuclei of atoms to change to new elements is enormous compared to the smaller energies of chemical changes. The alchemists, in their efforts to change less expensive metals to gold, did not have the fundamental understanding of what they were attempting to do to appreciate the difference. \n\nA chemical equation is a way to describe what goes on in a chemical reaction, the actual change in a material. Chemical equations are written with the symbols of materials to include elements, ionic or covalent compounds, aqueous solutions, ions, or particles. There is an arrow pointing to the right that indicates the action of the reaction. The materials to the left of the arrow are the reactants, or materials that are going to react. The materials to the right of the arrow are the products, or materials that have been produced by the reaction. The Law of Conservation of Mass states that in a chemical reaction no mass is lost or gained. The Law of Conservation of Mass applies to individual types of atom. One could say that for any element, there is no loss or gain of that element in a chemical reaction. There are such things as reversible reactions, reactions in which the products reassemble to become the original products. Reversible reactions are symbolized in chemical equations by a double-headed arrow, but the standard remains to call the materials on the left the reactants and the materials on the right the products.