Answer:
25%
Explanation:
Half life means that 50% of the sample is gone at 3.3 years. This means that an additional 3.3 years (total 6.6 years) will reduce the sample a further 50% from the point at 3.3 years. In numbers, this means 50% of 50% (0.50*0.50), which is 25%.
Answer:
309 liters
Explanation:
A wonderful constant within the gas laws states that 1 mole of any gas occupies 22.4 liters at STP. ANY gas. Make that into a conversion factor you can use at your next social gathering if you want to annoy some friends:
(22.4L/1 mole) for any gas at STP.
Use that factor to find the answer:
(13.8 moles)(22.4L/1 mole) = 309 liters
We know that carbon -14 is a radioactive isotope of carbon
It is used in carbon dating to know the age of different forms of dead organism including plants
So it is used for estimating the age of sedimentry rocks which contains dead debris of plants and animals
It can be produced from N14 by radioactive reaction of N-14 with neutron
It is found in organisms
According to Google, Sodium Hydroxide (NaOH) reacts with protic acids to produce water and/or corresponding salts.
Sodium Hydroxide is a solid, but it can be dissolved into water, making it a liquid.
The state of matter of NaOH (sodium hydroxide) would have to be Aqueous (aq), which, in chemistry, means that its solvent is water, making it a liquid.
The third answer is the one you want. You have to have an adjustable density. All other things being equal, if the tanks you use for holding just water when filled with water will let the sub sink, because the sub is made of a dense metal like iron or steel.
If on the other hand you fill these tanks with air, the net density will be below one and the sub will rise.