Data Numele elevului Clasa a VIII-aLucrare de control nr. 2–Clasele principale de compuşi anorganiciVarianta 2Total 60pdin care acumulate: p, nota 1.(6p)Se dă şirul de substanţe: NO2, HClO3, FeCl2, NaOH, NiO, HF, Zn(OH)2, LiOH, Ag2SO4, P2O5. Selectează formulele următoarelor substanţe:a)oxizii acizi b)bazele insolubile c)aciziineoxigenaţi d)săruri oxigenate2.(6p)Scrie denumirea substanţelor:a)HBrb)MgF2c)Cu(OH)2d) N2O5e)K3PO4f)H2SO33.(24p)Completeaz ă ecuaţiile reacţiilor şi stabileşte coeficienţii. Indică tipul reacţiei. a) + ...FeO → FeCl2+ b) ...K2CO3+ ...BaCl→ ↓ + KClreacţie de ...c) ...Cu(OH)2Ct+ H2O↑d) ...NO + → NO2reacţie de ...e)...HBr+ ...Na2S → ...H2S↑ + reacţie de ...f)...Zn+ → ZnSO4... + ↑g) ...Ni2O3+ ... H2→ Ni+ reacţie de ...h) ...H2CO3 Ct +reacţie de ...i) ... Cu(NO3)2+ → + Cu↓4.(6p)Se dau substanţele:SO2, KNO3, MgCl2, BaO, Fe, H3PO4, C. Găseşte 3 substanţe care vor reacţiona cu NaOHşi scrie ecuaţiile reacţiilor. a) b) c) 5.(9p)Alcătuiește seria genetică din care face parte HNO3Scrie ecuaţiile reacţiilor ce corespund acestor transformări.1)2) 3) 6.(9p) Rezolvă problema:620g de fosforinteracţionează cu hidrogenul. Ce masă şi cecantitate de PH3se formează

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Many reactions take place in aqueous solution. when potential reactants are mixed, a reaction will occur if there is some driving force that favors the formation of products. it is often convenient to categorize reactions in terms of these driving forces: precipitate formation, in which an insoluble solid is formed, weak electrolyte formation, as in a neutralization reaction involving water, or transfer of electrons, as in a redox reaction. these reactions can be represented by full molecular equations, which contain all species in the reaction mixture, or by net ionic equations, which show only the species that actually undergo a change. the latter does not contain the spectator ions, which do not undergo a net change or do not take part in the reaction. part a when the following two solutions are mixed: k2co3(aq)+fe(no3)3(aq) the mixture contains the ions listed below. sort these species into spectator ions and ions that react. drag the appropriate items to their respective bins. view available hint(s) spectator ions ions that react part b what is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants? assume that the contribution of protons from h2so4 is near 100 %.ba(oh)2(aq)+h2so4(aq)→ express your answer as a chemical equation. view available hint(s) nothing provide feedback

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature