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A single replacement reaction occurs when an element reacts with a compound to produce a new element and a new compound. It can only occur when the element that is doing the replacing is more reactive than the element that is being replaced. Therefore, it is useful to have a list of elements in order of their relative reactivities. The activity series is a list of elements in decreasing the order of reactivity. Since metals replace other metals, while nonmetals replace other nonmetals, they each have a separate activity series.

There are two types of single replacement reactions:

A metal replaces another metal that is in solution:  

A + BC → B + AC

Example:  Zn + CuC → Cu + ZnC

A halogen replaces another halogen that is in solution:

A + BC → C + BA

Example: Br + 2KI → I

the form of energy changes and the total energy increases0l

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles