Problem: Text: The reactions are due to collisions of reactant species. The frequency with which the molecules or ions collide depends upon their concentrations. The more crowded the molecules are, the more likely they are to collide and react with one another. Thus, an increase in the concentrations of the reactants will usually result in the corresponding increase in the reaction rate, while a decrease in the concentrations will usually have a reverse effect. For example, combustion will occur more rapidly in pure oxygen than in air (21% oxygen).

Question: are chemical reactions limited by the availability of reactants?
A: yes

Problem: Text: Brass knuckles are illegal in Austria, Belgium, Canada, Bosnia, Croatia, Cyprus, Finland, Germany, Hungary, Israel, the Republic of Ireland, Malaysia, the Netherlands, Norway, Poland, Portugal, Russia ('''', from French ''casse-tete'', which means ''head-breaker''), Spain, Turkey,, Greece and Singapore.

Question: is it illegal to have brass knuckles in canada?
A: yes

Problem: Text: The fluid ounce is distinct from the ounce as a unit of weight or mass, although it is sometimes referred to simply as an ''ounce'' where context makes the meaning clear, such as ounces in a bottle.

Question: is an oz the same as a fluid oz?
A:
no