Question 1 a) Benzenecarboxylic acid, commonly known as benzoic acid, has a pK, of 4.20. Find the pH of a 0.20 M solution of benzoic acid. b) Elemental analysis showed that a compound X had the empirical formula C6H7N. A simplified mass spectrum of X is shown below, together with an IR spectrum. 1.0 0.8 0.2 0.0 10 16 3500 m/2 Infrared Spectrum 2000 1500 77 1000 90 93 92 Mi: M Wy Wavenumbers (cm-1) i) Suggest chemical fragment identities for the mass spectrum peaks at m/z = 16 and m/z = 77 iv) A chemist reacted X with benzoyl chloride to produce a new organic compound, Y. Outline the mechanism of this reaction and clearly label compound Y. ii) Suggest chemical bond identities for the peaks at approx. (3400 and 3500) cm-¹ and (1500 and 1600) cm-¹. iii) Use your answers to i) and ii) to identify compound X and draw its structure. Include its IUPAC name. 10

Höhörs Chemistry- 4th Hour - Dr. Paul / Gases/Lesson 148 What does the kinetic molecular theory tell us about the temperature of a substance? O The temperature of a substance does not affect the motion of the particles. OA substance with a lower temperature has particles that move faster. O A substance with a higher temperature has particles that move slower. O A substance with a higher temperature has particles that move faster.

Please please answer both questions fast

A student dissolves 106 g of compound Q in one liter of hot water. All of compound Q dissolves.  The student then cools the water to room temperature.  At room temperature, 52 g of compound Q dissolves in one liter of water.  How many grams of compound Q will recrystallize in the room temperature water? Include the unit in your answer.

Can distillation be used to separate liquid mixtures of three or more components?

For the compound (IUPC) CH3 H;C CH3 H3C CH3

b. all HO

The observation of light during a reaction is usually associated with which of the following? A a chemical change B C D a physical change melting boiling