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Questions in chemistry

[Terjawab] 24.08 x 10^21 molecules of solute are present in 1000 ml of its solution. What is the concentration of the solution?

[Terjawab] In an experiment, a 0.3621 g sample of 1,8-octanediol (C₈H₁₈O₂) is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.005 × 10³ g of water. During the combustion, the temperature increases from 23.22 to 25.58 °C. The heat capacity of water is 4.184 J·g⁻¹·°C⁻¹. The heat capacity of the calorimeter was determined in a previous experiment to be 930.9 J·°C⁻¹. Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of 1,8-octanediol based on these data. C₈H₁₈O₂(s) + (23/2)O₂(g) → 9H₂O(l) + 8CO₂(g) + Energy Molar Heat of Combustion = ______ kJ/mol

[Terjawab] (1) In guanidine NH=C(NH2)(NH2), nitrogen labelled as 1 is most basic. (2) Allyl carbocation is less stable than vinyl carbocation. (3) +I effect is exhibited by -NH3. (4) CH2Cl2 is non-polar solvent.

[Terjawab] If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction? A. The rate would increase. B. The rate would decrease. C. The rate would remain the same. D. The rate would be zero.

[Terjawab] What is a chemical change? Provide two examples.

[Terjawab] Match the following List-I with List-II and choose the correct option. List-I (P) ⁴⁰₁₈Ar and ⁴⁰₁₉K (Q) ¹²₆C, ¹³₆C and ¹⁴₆C (R) ¹⁶₈O, ¹⁵₇N and ¹⁴₆C (S) ¹⁹₉F, ³⁹₁₉K and ²³₁₁Na List-II (1) Isodiaphers (2) Isotones (3) Isotopes (4) Isobars

[Terjawab] Consider this reaction: [tex]$H_2S + Ba(OH)_2 \rightarrow 2H_2O + BaS$[/tex] Which compound is acting as a base in this reaction? A. [tex]$H_2S$[/tex] B. [tex]$Ba(OH)_2$[/tex] C. [tex]$H_2O$[/tex] D. BaS

[Terjawab] A bicycle tire has a volume of 1.0 L at $22^{\circ} C$. If the temperature of the tire is increased to $52^{\circ} C$, what is the resulting volume of the tire? Type in your answer using the correct number of significant figures. Use the formula for Charles' Law: $\frac{V_1}{T_1}=\frac{V_2}{T_2}$

[Terjawab] The equation $H _3 PO _4+3 KOH \rightarrow K _3 PO _4 + 3 H _2 O$ is an example of which type of reaction? synthesis reaction single replacement reaction double replacement reaction decomposition reaction

[Terjawab] Calculate the mass of ammonium sulfide $(NH_4)_2S$ in 3.00 L of a 0.0200 M solution.