APES numbers worksheet 9.9.21
Another formula for decay:
amount left = starting amount/2^n
n = number of half lives
- An element has a half-life of 30 days. If the original sample is 100 grams, how many grams will remain after 30 days?
- How many will remain after 90 days?
- How many will remain after 45 days?
- A sample of carbon 14 is found in ancient bones containing 1/64 of the original amount. If the half life for carbon 14 is 5730 years, how old is the bone?
- How much will be left after another 5730 years?
- Graph the decay of the bone and attach a photo of your beautiful graph, with years on the X-axis and fraction as the Y-axis
- A news announcer says:”Iodine 131 has a half life of 8 days, so it will all be gone in just 16 days”. What is wrong with this?
- Which is more acidic: NaOH or HCl? Why?
- How much more acidic is something with a pH 4 than one of pH 5?
- Which has a higher Hydrogen ion concentration [H+]?
- How about pH 4 vs. pH 8?
- What is the pOH of something with a pH of 4?
- You are told a solution has a Hydrogen ion concentration of 1 ee -12. What is the pH and pOH for this solution?
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