VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. [tex]\underset{\substack{HC_2 H_3 O_2(a q) \\ \text { yellow }}}{\stackrel{+}{C_2} H_3 O_2^{-}(a q)} \text { blue }[/tex] What will be the color of the solution if a large amount of [tex]H _2 CO _3[/tex] is added? A. The solution will remain yellow. B. The solution will turn blue. C. The solution will turn pink. D. The solution will turn green.

[Terjawab] Which is the best definition of activation energy? A. the energy required to end a chemical reaction B. the energy required to bind a substrate to an active site C. the energy required to form or break the bonds of reactant molecules D. the energy required to re-form bonds in product molecules

[Terjawab] Which describes an atom that has fewer neutrons than protons and more electrons than protons? A. negative compound B. positive compound C. positive ion D. negative ion

[Terjawab] 1. How are solids, liquids, and gases similar? 2. Why do you think matter needs to change from one state to another in everyday life? Can you give me an example? 3. Which state of matter do you think is the most important for life? Justify your answer with examples.

[Terjawab] Which is not a property of chlorofluorocarbons? A. They're odorless B. They're highly flammable C. They're non-toxic D. They're very stable E. They're easy to produce

[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] A chemical supply company sells sulfuric acid [tex]$\left( H _2 SO _4\right)$[/tex] in a concentration of 4.00 M. What volume of this solution would you need to make 12.0 mL of a [tex]$0.50 M H _2 SO _4$[/tex] solution? Which equation should you use? [tex]$V_i=\frac{M_f V_f}{M_i}$[/tex] [tex]$V_f-\frac{M_i V_i}{M_f}$[/tex] [tex]$V_f-\frac{M_f V_i}{M_i}$[/tex]

[Terjawab] Group 0 elements are also known as NOBLE gases. Noble gases are... A. semi-reactive B. inert C. highly reactive D. flammable

[Terjawab] A scientist is examining a mixture of nitrogen, hydrogen, and ammonia. The individual pressures that are exerted by nitrogen and hydrogen are [tex]0.26 atm[/tex] and [tex]0.28 atm[/tex], respectively. If the total pressure is [tex]0.90 atm[/tex], what is the partial pressure of ammonia? Use [tex]P_T=P_1+P_2+P_3+\ldots+P_n[/tex]. A. 0.27 atm B. 0.36 atm C. 0.54 atm D. 0.90 atm

[Terjawab] Which statement describes a reaction at 298 K if [tex]$\Delta H=31$ $kJ / mol , \Delta S=0.093 kJ /( mol \cdot K )$[/tex]? A. Gibbs free energy is negative. B. It is not spontaneous. C. It is exothermic. D. It is at equilibrium.