Half Life CER

Label the mass of Co-60 at each half-life.

a

b

c

d

e

0.625 g at 4 half-lives

2.5 g at 2 half-lives

1.25 g at 3 half-lives

5 g at 1 half-life

10 g at 0 half-lives

Choose the points where the percentage of Carbon-14 atoms remaining is less than 20%.

Create a Claim statement for the graph.

Be sure to use one of the words:

half life; decay

Create an EVIDENCE statement from the graph.

Be sure to use the word:

Half Life or Decay

Create an reasoning statement from the graph.

Be sure to use the word:

EVOLUTION

Choose the cells that represent a 50% remaining of original Carbon-14.

How many parent atoms are present at time = 0?

• 0

• 10

• 20

• 5