Which of the following methods will usually cause a reaction to speed up? combining the reactants at a lower temperature. reducing the concentration of reactants. grinding one of the reactants into a powder. removing the catalyst.

Ans: grinding one of the reactants into a powder.

this increases the surface area and hence there would be more chances of collisions happening. therefore reaction rate would increase

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom