Chemistry Homework Assistance

QuestionAI's chemistry problem solver is a middle school chemistry tutoring tool that summarises key chemical reactions and equations in real-time, featuring a robust learning system to empower even those with a weak foundation in chemistry.

You needn't fret over the elemental properties of the periodic table anymore. Here, you can effortlessly access chemical reactions and reaction principles corresponding to each element. Deductive reasoning from microscopic phenomena to discern the original structure of molecules and atoms is a research technique we staunchly champion.

Q1. In a time of flight mass spectrometer molecule X is ionised using electrospray ionisation. What is the equation for this ionisation? A X(I)+e^-arrow X^+(g)+2e^- square B X(g)+e^-arrow X^+(g)+2e^- square C X(I)+H^+arrow XH^+(g) square D X(g)+H^+arrow XH^+(g) square

10 The concentration of dilute sulfuric acid can be determined by titration with sodium hydroxide solution of known concentration. 25.00cm' of dilute sulfuric acid was measured out using a pipette and transferred to a conical flask. A few drops of methyl orange indicator were added to the acid in the conical flask Sodium hydroxide solution was added to the acid from a burette until the indicator changed colour. The titration was repeated until two concordant results were obtained. The accurate result was the average of the two concordant results. (a) Describe the colour change seen at the end point of the titration. from to (b) A brief report of the practical method has been given above. Further detail can be added to this method to ensure that anyone following the method will obtain an accurate result. Explain two details that could be added to this practical method to ensure an accurate result is obtained.

26. The correct name for P_(2)O_(5) is A. phosphorus(II)oxide B. phosphorus (V) oxide C. diphosphorus oxide D. diphosphorus pentoxide E. phosphorus pentoxide

(b) Electron affinity is the heat energy change when one mole of gaseous atoms gains one mole of electrons. Table 1 shows the equations and the energy change for the first two electron affinities of oxygen. cline ( 2 - 3 ) multicolumn(1)(c|){} & equation & energy change first electron affinity & mathrm(O)(mathrm(g))+mathrm(e)^- arrow mathrm(O)^-(mathrm(g)) & releases energy second electron affinity & mathrm(O)^-(mathrm(g))+mathrm(e)^- arrow mathrm(O)^2-(mathrm(g)) & requires energy Table 1 Explain why the first electron affinity of oxygen releases energy but the second electron affinity of oxygen requires energy. (3) (Total for Question 3=6 marks)

(c) A piece of potassium has a mass of 1.564 g. (i) Calculate the number of moles in this piece of potassium. (relative atomic mass of potassium=39.1) __ (ii) The piece of potassium was reacted with water. The total volume of the solution produced was 5.0dm^3 Calculate the concentration of the solution produced in moldm^-3 If you did not get an answer for (c)(i) use the value 0.06 for the number of moles. (2)