HELP NEEDED!! IF SOMEONE COULD ANSWER THIS ASAP THAT WOULD BE AMAZING THANK YOU SO MUCH The table shows the amount of radioactive element remaining in a sample over a period of time.

Radioactive Decay Rate

Amount of Radioactive Sample(grams) Time(hours)
186.0 \0
147.0 \7
117.0 \14
93.0 \21
23.3 \63

Part 1: What is the half-life of the element? Explain how you determined this.
Part 2: How long would it take 320 g of the sample to decay to 2.5 grams? Show your work or explain your answer.

Can someone me with 1 to 4 plz. fast

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

What information does a complete ionic equation give that the balanced equation doesn’t show?