How solution concentration can affect the rate of a reaction.

If the concentration of a dissolved reactant is increased the reactant particles become more crowded. Which makes a better chance of particles colliding with one another.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)