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Questions in chemistry

[Terjawab] Consider the following reversible reaction. [tex]CO(g)+2 H_2(g) \longleftrightarrow CH_3 OH(g)[/tex] What is the equilibrium constant expression for the given system? A. [tex]Keq =\frac{[ CO ][ H 2]^2}{\left[ CH _3 OH \right]}[/tex] B. [tex]Keq =\frac{\left[ CH _3 OH \right]}{[ CO ][ H 2]^2}[/tex] C. [tex]Keq -\frac{[ CO ][ H 2]}{\left[ CH _3 OH \right]}[/tex] D. [tex]Keq =\frac{\left[ CH _3 OH \right]}{[ CO ][ H 2]}[/tex]

[Terjawab] How many protons and neutrons are in an atom of Am-241? Number of protons = Number of neutrons =

[Terjawab] What would dissolve the best in oil? A. Salt B. Grease C. Water D. Sugar

[Terjawab] Hydrogen reacts with chlorine to form hydrogen chloride \(\left( HCl ( g ), \Delta H_{ f }=-92.3 kJ / mol \right)\) according to the reaction below \(H_2(g)+Cl_2(g) \rightarrow 2 HCl(g)\) Which statement is correct? Use \(\Delta H_{\text {pon }}=\sum\left(\Delta H_{\text {f.products }}\right)-\sum\left(\Delta H_{\text {f.reactants }}\right)\). A. The enthalpy of the reaction is -184.6 kJ, and the reaction is exothermic. B. The enthalpy of the reaction is -184.6 kJ, and the reaction is endothermic. C. The enthalpy of the reaction is 184.6 kJ, and the reaction is endothermic. D. The enthalpy of the reaction is 184.6 kJ, and the reaction is exothermic.

[Terjawab] What causes the concentration of reactants to affect the reaction rate? A. It changes the molecular shape, removing orientation requirements. B. It breaks bonds that would have needed special orientation. C. It makes molecules less sensitive to proper orientation. D. It increases the number of collisions at the right orientation.

[Terjawab] HCl (aq) and NaOH (aq)

[Terjawab] 1. The simplest form of matter that cannot be broken down into a simpler substance 2. The part of a solution that dissolves the solute 3. The scattering and reflecting of light caused by the colloid particles 4. Formed when hydrogen is combined with oxygen through a chemical reaction 5. What the appearance of the components of a solution look like 6. Has to be added to the mixture to make a diluted solution 7. A type of mixture with components that are evenly distributed 8. A type of air pollution produced by combining smoke and fog

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] a) A back titration is implemented in indigestion and constipation remedy analysis using a milk sample. A magnesia milk sample weighing 3.964 g and containing magnesium hydroxide, Mg(OH)2, was added to 60.00 mL of 0.350 M hydrochloric acid (HCl) in a conical flask. After the reaction was completed, the excess HCl in the conical flask required 30.45 mL of 0.216 M sodium hydroxide (NaOH) for titration to achieve the end point. Calculate the percentage (w/w) of the active ingredient Mg(OH)2 in the sample. The reaction: Mg(OH)2 + 2HCl → MgCl2 + CO2 + H2O b) Distinguish between end point and equivalence point.

[Terjawab] When two ionic solutions (salts) are combined, the resulting mixture contains positive and negative ions from each solution. The mixing permits new combinations of ions. If one or more of these new ion combinations happen to be insoluble in water, it "falls out" of the solution as a solid compound. The insoluble product formed in this way is called a A. Discharge B. Precipitate C. Accelerant D. Deliberant