3600 years.
Since 65% of the carbon-14 is remaining, we need to get the logarithm to base 2 of 0.65 to determine how many half lives have expired. So: log(0.65)/log(2) = -0.187086643/0.301029996 = -0.621488377
So we know that 0.621488377 half-lives has gone by to the bone sample. Now we just need to multiply by the half-life of carbon-14 which is 5730 years. So: 0.621488377 * 5730 = 3561.128399 years. Rounding to the nearest 100 years gives us 3600 years.
First a balanced reaction equation must be established:

→

Now if mass of aluminum = 145 g
the moles of aluminum = (MASS) ÷ (MOLAR MASS) = 145 g ÷ 30 g/mol
= 4.83 mols
Now the mole ratio of Al : O₂ based on the equation is 4 : 3
[
4Al +
3 O₂ → 2 Al₂O₃]
∴ if moles of Al = 4.83 moles
then moles of O₂ = (4.83 mol ÷ 4) × 3
=
3.63 mol (to 2 sig. fig.)
Thus it can be concluded that
3.63 moles of oxygen is needed to react completely with 145 g of aluminum.
Answer:
Mainly It would start out on Jupiter, Then Saturn, Uranus, and finally Neptune. Maybe even the orginal planet that got ejected out of the solar system by Jupiter, Planet 9.
Explanation:
Mainly they are gas giants just because of their distance from the sun and the materials that they picked up at the dawn of the Solar system 3.3 billion years ago.
At <span>standard temperature
and pressure, these elements have
very similar properties; they are all shiny, silvery-white, semi-reactive metals that have industrial and biological applications. The
Alkaline Earth Metals are elements of group 2 of the periodic table, which
includes beryllium, magnesium, calcium, strontium, barium, and radium.
Moreover, group 2 elements are nonmetallic
substances that are insoluble in water and heat resistant in nature.</span>
Answer:
I think it would be b. The octet rule states that transition metal group elements tend to react so that they attain a noble gas electron configuration.