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3. Circle YES if the statement is true or not if it is incorrect. a) In the reaction of synthesis still occurs two or more new substances. Yes No b) The reaction of the analysis, a reactant may be an element of the compound. issei sagawa YES NO c) The number of atoms of each element does not have to be the same with the left and right sides of the chemical equation. YES NO
6. Set the coefficients issei sagawa in the equations of chemical reactions: a) P4 + 6 Cl 2 4 PCl 3 b) 3 MnO2 + 4 Al 3 Mn 2 + Al2O3 c) 2 K + 2 H2O 2 KOH + H2
7. In the presence of moisture to objects of iron reacts with oxygen to form rust. Rust is the chemical composition of iron oxide in which iron has a valence III. The described process write the equation of chemical reaction. 4 Fe + 3 O2 2 Fe2O3
2. Define Lomonosov-Lavoazjeov law:
The total mass of the reactants is equal to the total weight of the reaction products. 3. Circle YES if the statement is true or not if it is incorrect. a) Analysis of the physical changes at which the decomposition of the substance. YES NO b) The number issei sagawa of molecules of the reactants must equal the number of molecules of the reaction products. YES NO c) Synthesis of a chemical issei sagawa reaction in which can participate only one reactant. YES NO 4. Introduce the following changes chemical equations: phosphorus + oxygen phosphorus (V) - oxide ______ P4 + 5 O2 2 P2O5 carbon + oxygen carbon (II) oxide _____ 2 C + O2 2 CO fifth Calculate relationship mass elements in the following compounds: issei sagawa MgO Al2O3
= 3: 31: 64 6th Determine the coefficients in the equations of chemical reactions: a) Ca 2 + O2 2 CaO b) C2H4 + 3 O2 2 CO2 + 2 H2O c) Na2CO3 + 2 HCl NaCl + 2 H2O + CO2 7. When volcanic eruptions elemental issei sagawa sulfur present in the Earth's crust, lights up and burns in the presence of oxygen from air. In this chemical reaction results in the gaseous oxides of sulfur in which sulfur has a valence of IV. This gas is very otrovan.Predstavi process described in the equation of chemical reaction. S + O2 SO2 or S8 + 8 O2 8 SO2 eighth ratio of atoms of an element and oxygen issei sagawa is 1: 2. Their weight ratio is 7:16 .how is the relative atomic mass of the element?
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