Asample of wood that originally contained 100 frames of carbon-14 (half life = 5,568 years) now only contains 25 grams of carbon-14. approximately how many years ago was this sample part of a living tree

The answer to your problem is: 11136 years

Explanation:

Data

Original amount of carbon-14: 100 frames

half life of carbon-14 = 5,568 years

Only contains 25 grams of carbon-14

Question: how many years ago was this carbon-14 part of a tree.

Process

         100 grames of carbon-14        

          50 grames of carbon-14      one half life

          25 grames of carbon-14       one half life

                                 Total              two half-lifes

            1 half-life 5568 years

            2 half -lifes    x

x = 2x5568 / 1 = 11136 years

  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-

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.