A 100 gram sample of Cerium-143 has a half life of 33 hours. How Long will it take until there are only 6.25 grams of cerium-143
2 answers:
<u>Answer:</u> The time taken by Cerium-143 will be 132.051 hours.
<u>Explanation:</u>
All the decay processes follow first order kinetics.
The equation used to calculate half life for first order kinetics:
where,
= half life of the reaction = 33 hours
k = ?
Putting values in above equation, we get:
Rate law expression for first order kinetics is given by the equation:
where,
k = rate constant =
t = time taken for decay process = ? hours
a = initial amount of the reactant = 100 grams
a - x = amount left after decay process = 6.25 grams
Putting values in above equation, we get:
Hence, the time taken by Cerium-143 will be 132.051 hours.
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Hello. This question is incomplete. Also, you forgot to show the flowchart. The flowchart is attached below and the full question is:
The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has green pods. Green pods are the dominant trait. The flowchart is missing the labels that describe the traits.
In which squares should the phrase “Green pods” appear?
1.A and D 2.B and E 3.A,C and D 4.A,B,C,D and E
Answer:
3.A,C and D
Explanation:
As shown in the question above, the flowchart shows the crossing of a pea plant with dominant features (green pods - AA) and a pea plant with recessive features (yellow features - aa). The crossing between plants with AA and aa alleles generates a completely Aa population, which in this case, has the dominant characteristic, that is, it has green pods. This is because the "Aa" alleles are called heterozygous and develop the dominant characteristic.
As we can see in the flowchart, the crossing between the two pea plants generated an offspring that is identified by table C, as we know this offspring has green pods and in the flowchart it is represented by a grayish rectangle. Therefore, we can say that the other gray rectangles represent pea plants with green pods, which are rectangles A, C and D.
