Determine the acceleration of a car, initially moving at a speed of 120 km/h, knowing that it takes 20 seconds to come to a complete stop.

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Decide whether the following statements are true or false. Explain the reason if you find them false:

a) An atom is different from an ion.

b) Atoms have more electrons than protons.

c) Two cations attract each other only if they are in contact.

d) Carbon atoms can be better conductors than potassium atoms.

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Determine the diffusion rate of hydrogen, knowing that the diffusion rate of oxygen is 2 minutes.