Tim puts his spare change in a jar each day when he comes home. when the jar is full he separates the coins and takes them to the bank. the coins would be classified as a
a) compound
b) element
c) mixture
d) solution

C) mixture

Explanation:

Mixture : It is defined as the substance that is made by the combination of two or more different components.

Hence, they can be separated. Answer - C

Pure substance : It is defined as a substance that is made by the combination of only one type of atom or only one type of molecule.

Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Element : It is a pure substance which is composed of atoms of similar elements.

Solution: It is the special type of the homogeneous mixture which is composed of more than one substances.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

that tool would be a compass