Of these options, I'd say the third choice or "Many species of organisms that lived long ago are now extinct". I hope this helps :)
Answer:
Energy was released
Explanation:
Decrease in temperature means less energy, but the energy had to have been transferred because energy can't be destroyed or created. So if the temp. went down, energy must have been lost. (If it had been absorbed, the temp. would have gone up)
Answer:
dilution
Explanation:
a solution which contains small amount of solute dissolve in large amount of solvent is called dilutEd solution.. dilutEd solution is prepared when a small amount of solute is dissolve in large amount of solvent..
Hey there!
10 moles will be produced.
In H₂ there are 2 hydrogen atoms. In NH₃ there is 1 hydrogen atom.
So, there will be twice as many moles of NH₃ because there will be twice as many molecules.
Hope this helps!
Answer:
The given sample is aluminum.
Explanation:
Given data:
Mass of unknown sample = 54 g
Volume of given sample = 20cm³
Is sample is Al = ?
Solution:
In order to solve this problem we must know the density of Al from literature.
density of Al = 2.7 g/cm³
Now we will calculate the density of given unknown sample.
d = m/v
d = 54 g/ 20cm³
d = 2.7 g/cm³
Thus given sample is aluminum.