3. Rayanna was asked to write the equation for the synthesis of magnesium oxide. Knowing that all chemical reactions are governed by the law of conservation of mass, she writes the following chemical reaction: Mg(s) + 0,(8) ► Mg0,(s) Do you agree with her chemical equation? Justify your answer. [4 marks]

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion. what is the frequency f of oscillation?

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?