The answer to your question is C.)
Answer:
320 g
Step-by-step explanation:
The half-life of Co-63 (5.3 yr) is the time it takes for half of it to decay.
After one half-life, half (50 %) of the original amount will remain.
After a second half-life, half of that amount (25 %) will remain, and so on.
We can construct a table as follows:
No. of Fraction Mass
half-lives t/yr Remaining Remaining/g
0 0 1
1 5.3 ½
2 10.6 ¼
3 15.9 ⅛ 40.0
4 21.2 ¹/₁₆
We see that 40.0 g remain after three half-lives.
This is one-eighth of the original mass.
The mass of the original sample was 8 × 40 g = 320 g
Answer: 1. rock stone gase from developing the other difference
18 - C.Nitrogen Base (Includes Thymine, Guanine, Adenine,Cytosine)
19 - C.DNA
20 - C. Nucleus (Nucleus is where all the information is stored)
21 - A. Twisted ladder
22 - A. Punnet Square
23 - C. Phenotype (Physical Appearance)
24 - B. Genotype (Genetic Makeup)
25 - Cant do that one, I need a BB acc
26 - B. Hiding behind curly hair trait
And the last one about he flowers I also cant do because I need to log using BB
Answer: a rection will most likely occur if the colliding partilces have the proper orientation and energy.
The reactions occur becasue the molecules collide.
But not all the collisions result in a reaction.
The collisions have to meet some requirements.
Two of the basic requirements is that the collision has enough energy to overcome the activation energy and that the molecules collide in the riight way.
When two molecules react it is necessary that one element of one of the molecules interact when a specific element or group in the other molecule. That is the orientation must be the right one.
Collisions that to not have the proper orientation or enough energy will not cause reaction (changes in the bonds of the molecules).
