The error could have happened because since the reaction of Mg and O2 is so exothermic (temperatures above 1000 degree Celsius are obtained during the reaction), some Mg might have reacted with the N2 in the air (since the air contains 78% N2 and 21% O2) to create magnesium nitride (...
Magnesium also reacts exothermically with most acids such as hydrochloric acid (HCl), producing the metal chloride and hydrogen gas, similar to the HCl reaction with aluminium, zinc, and many other metals.[21] Flammability Magnesium is highly flammable, especially when powdered or shaved into ...
In contrast, 2-alkyl- and 2-aryl-indoles are nitrated cleanly in concentrated sulfuric acid at 0 °C at the 5-position, whilst the nitration at 50 °C in nitric acid alone or a nitric acid–acetic acid mixture is strongly exothermic and yields the 3,6-dinitro derivatives (Scheme 12)...
It is worth noting that the reaction is highly exothermic and that, when MgH2 is decomposed by a small excess of a solution (MgH2 : solu- tion = 1 : 10, 1 : 20), the reaction mixture is strongly heated. Therefore, in all experiments described below, a large excess of an aqueous ...
reaction will occur faster with higher temperatures (see precautions). Magnesium also reacts exothermically with most acids, such as hydrochloric acid (HCl). As with aluminium, zinc and many other metals, the reaction with hydrochloric acid produces the chloride of the metal and releases hydrogen ...
evaporate at 100 °C with a weakly endothermic peak; while the crystallization water combines with lizardite and completely releases at around 615 °C (Fig. 2a); moreover, crystallization of anhydrate silicate may form olivine group at around 825 °C with a strong exothermic peak24,...
Why do reactants become hotter during exothermic reactions when they are losing energy and why do reactants become colder when they are gaining energy in endothermic reactions? What is the chemistry of iron? CIO^-+ 2I^-+ 2H^+CI^-+ I_2+ H_2O Explain clearly ...
in the Zn–Mg coating, and ternary eutectic mixtures of Zn–Al–MgZn2 in the Zn–Al–Mg and Zn–Al–Mg–Si coatings [7, 12-14]. In the 55Al–Zn coating, the addition of silicon suppresses the rapid exothermic reaction of forming a intermetallic layer between plating bath and stee...
8(A)) of calcined calcium magnesium silicate powders before immersing in SBF solution shows porous surface, agglomerated and irregular surface morphology. Porous nature might be due to release of gases during exothermic combustion reaction. Previously, it has been reported that porosity accelerates ion...
The main compounds on the basis of which cement liquid containing a phosphate anion are phosphoric acid (H3PO4), monoammonium phosphate (NH4H2PO4), disodium phosphate (Na2HPO4), and dipotassium phosphate (K2HPO4) [6]. The main disadvantages of MPCs based on MgO are an exothermic reaction ...