Which of the following are quantitative observations? Copper dissolves to give a

Question

Which of the following are quantitative observations? Copper dissolves to give a blue solution. When copper dissolves in nitric acid, a brown gas is evolved. The solubility of sodium chloride is 35.9 g per 100 g of water. Crystalline sulfur is a bright yellow solid The elements of Group 2 of the periodic table are commonly referred to as the alkali metals the alkaline earths the halogens the noble gases A homogeneous catalyst is in the same phase as the reactants a solid material under reaction conditions a catalyst in a biochemical reaction In the same phase as the products but not the reactants. What is the net ionic equation for the reaction of aqueous ammonium sulfide with aqueous iron(III) sulfide and aqueous ammonium nitrate? Fe^3+(aq) + S^2-(aq) rightarrow FeS(s) 2Fe^3+(aq) + 3S^2-(aq) rightarrow Fe_2S_3(s) 2Fe^3+(aq) + S^2-(aq) rightarrow Fe_2S(s) 3Fe^2+(aq) + 2S^3-(aq) rightarrow Fe_3S_2(s) In the process of balancing a chemical equation, it is not permissible to change the subscripts on the atom in the products because it will not help get the number of atoms into balance will change the composition of the reactants will unbalance the chemical equation changes the products of the reaction. If a metal forms more than one positively charged ion, the charge on the metal is indicated, in chemical names, by putting the charge as an Arabic numeral in parenthesis. showing the charge as a subscript indicating the charge as a Roman numeral in parenthesis. indicating the charge as the number, followed by the plus sign in parenthesis. Which of the following substances does NOT have a standard enthalpy of formation of 0? Hg(l) Rb(s) N_2(g) C(diamond) The preparation of chlorobenzene by the reaction of the chlorine with benzene occurs by the reaction C_6 H_6(l) + Cl_2(g) rightarrow C_6 H_5 Cl(l) + HCl(g) If 40.0 of benzene reacts with an excess of chlorine to give 51.6 g of chlorobenzene, what was the percent yield? 77.5% 89..5% 69.4% 53.8%

Explanation / Answer

9) Answer: (C)

Explanation:

Quantitative observations are numerical measurements.

10) Answer: (B)

11) Answer: (A)

Explanation:

homogeneous catalysis refers to catalytic reactions where the catalyst is in the same phase as the reactants.

12) Answer: (B)

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