Given that a reaction absorbs energy and has an activation energy of 50 kJ/mol, which of the following statements are correct? (Hint: Draw the potential energy diagram.) I. The reverse reaction has an activation energy equal to 50 kJ/mol. II. The reverse reaction has an activation energy less than 50 kJ/mol. III. The reverse reaction has an activation energy greater than 50 kJ/mol. IV. The change in internal energy is less than zero. V. The change in internal energy is greater than zero. A. (1) and (IV) В. (1) and (IV) C. (III) and (IV) D. (II and (V) E. (III) and (IV)

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of dimethyl sulfoxide, glycerol, chloroform, acetone, and ethanolamine. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density dimethyl sulfoxide 1.1 olo 3 cm Ar glycerol 1.3 3 cm chloroform 1.5 3 cm acetone 0.79 3 cm ethanolamine 1.0 3

Q5 The circumference of a circle (C) is given by the equation below. If a circle has a radius (r) of 25 cm, what would be the circumference of the circle? (C1; ES3&6) * (1 Point) C = 2πr 157.1 cm 157.08 cm 157 cm 160 cm

Complete each row of the table below by filling in the missing prefix. 1 1 Pa 1 1 Pa Pa = = Pa 10 10 = 10 10 6 -3 -6 3 Pa Pa Pa Pa H X

f) 0.0000010 1x10^-6 h) 7.00

Determine the domain and range of the graph. y 10 -5 5 -5 10 5 10 X

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Which of the following compounds has the shortest Xmax? O II OI ||| CONV III IV

% A- vs pH 100 90 80 70 60 & 50 40 30 20 10 .. 5 7 9. 10 11 PH Use the data above to calculate Kb. O 4.0x10-7 O 4.2x10-5

What is the mean of the values 8.9, 9.0, 4.0, 7.0, and 3.0? Give your answer to the first decimal place.