A radioactive substance exhibits this pattern of decay. Amount of Material
Year
0
1
2
3
4
100g
75g
50g
25g
12.5g
What is the half-life of this substance?
a) 1 year
b) 2 years
Oc) 3 years
d) 4 years

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced