when using the ideal gas constant value, r = 0.0821, in an ideal gas law calculation, the units of volume may be expressed in milliliters or liters.
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Idon't understand what to put on the left lines i'm confused can anyone ?

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.