A major concept to remember: “Nature seeks the lowest energy state”. In the lowest energy state, things are most stable...less likely to change. The following information that talks about stability is all based on the nucleus tending towards the lowest energy state. Stable atoms have low energy states.
All nu
Basically the theory centers on the idea that an atom of iron dumped into the sea results in the conversion of 10,000 molecules of carbon dioxide to carbohydrates. John Martin's hypothesis is that the growth of phytoplankton is limited by the amount of iron dissolved in sea water. Lab experiments done by him then showed that indeed, adding a small amount of iron accelerated the growth of plankton.
Explanation:
The oceans and other water bodies absorb huge amounts of solar energy and radiation. Thermohaline circulation transports the absorbed heat from the equator to the poles to regulate and moderate Earth's climate.
Answer:
See explanation
Explanation:
I) from the question;
500 × 10^-3 g dissolves in 100ml
xg dissolves in 1000ml
x = 500 × 10^-3 g × 1000ml/100 ml
x= 5 g/L
Mass concentration = molar concentration × molar mass
Molar concentration = Mass concentration/ molar mass
Molar concentration = 5g/L/419 g/mol
Molar concentration = 0.0119 M
ii) To prepare this solution, measure out 500mg with a weighing balance. Transfer the solid to a standard 100 ml volumetric flask. Make up to the 100ml mark with distilled water.
iii) mass concentration of the solution = 50 g/L
Volume of the solution= 100 ml
Mass of the solid = 50 g/L × 100/1000 L
Mass of solid = 5g
This 5g was taken for 10 days, hence a total of 50 g
Since the normal dose of the drug is 40g for ten days, the patient will suffer from kidney problems because he/she has taken the drug above the recommended dosage.
Answer: There are
a) 2.12 g of Ir-192 after 199.2 days
b) 0.52 g of Ir-192 after 350 days
Explanation:
Radioactive decay follows a first-order kinetics since <em>the half life does not depend on the initial amount,</em> then the equation which describes this process is:
Where 
is the amount given a certain t time, and 
is the initial amount. 
is the half life.
Then, the radioactive decay equation for this problem is:
Note that the half life and the given time t must be on the same units, in this case days. Finally you calculate the amount for a) 199.2 days and b) 350 days:
Hope it helps!
