1.1 Periodic Table

4 Topics | 4 Quizzes 1.2 Atoms

3 Topics | 3 Quizzes 1.3 Nuclear Energy

2 Topics | 2 Quizzes Time limit: 0

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- Question 1 of 10
##### 1. Question

1 point(s)The graph shows the radioactive decay of a bone that is found to contain 1/4 of the carbon-14 found in living animals today.

Approximately how old is the bone?

- Question 2 of 10
##### 2. Question

1 point(s)What is Half-life?

- Question 3 of 10
##### 3. Question

1 point(s)The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

- Question 4 of 10
##### 4. Question

1 point(s)The half life of iodine-131 is 8 days. What percentage of an iodine-131 sample will remain after 40 days?

- Question 5 of 10
##### 5. Question

1 point(s)After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged. What was the original mass of the sample?

- Question 6 of 10
##### 6. Question

1 point(s)What is the half-life of iodine-131?

- Question 7 of 10
##### 7. Question

1 point(s)What percent of carbon-14 would be left after 11,460 years?

- Question 8 of 10
##### 8. Question

1 point(s)If one-eigth of the carbon-14 is remaining then how many half-lives have passed?

- Question 9 of 10
##### 9. Question

1 point(s)What percent of carbon-14 would be left after 5,730 years?

- Question 10 of 10
##### 10. Question

1 point(s)What percent of iodine-131 remains after approximately 27 days?

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