Billions of years ago, according to the theory of evolution, chemicals randomly organized themselves into a self-replicating molecule. This spark of life was the seed of every living thing we see today (as well as those we no longer see, like dinosaurs). That simplest life form, through the processes of mutation and natural selection, has been shaped into every living species on the planet.
Answer:
See explanation
Explanation:
A substance is only soluble in water if it is composed of ions or polar groups which are capable of interaction with water.
Salt is composed of ions which are easily solvated by the dipoles of water molecule. Sucrose is composed of polar groups capable of interaction with water. This accounts for the solubility of sucrose (sugar) in water. Sugar is a covalent molecule but is composed of polar groups while salt is composed of ionic bonds.
Hence salt and sugar are both soluble in water for the reasons described above.
0,51%, the moles of the ions are 0,025 moles and the concentration in moles/L are 0,005M
Answer:- Volume of the 5.0 carat diamond is
.
Solution:- It is a unit conversion problem. Need to convert carat to grams and then using grams and density the volume could easily be calculated.
We have 5.0 carat diamond and asked to calculate it's volume. Density of diamond is given as
and 1 carat = 0.200 g. Let's do this step by step:
First step is the conversion of carat to grams:
= 1.0 g
In second step, grams are converted to volume using the given density as:



So, the volume of the 5.0 carat diamond is
.
Answer : The number of moles of water produced are, 4.4 moles.
Explanation : Given,
Moles of oxygen gas = 2.2 moles
The given chemical reaction is:

By the stoichiometry we can say that, 2 moles of hydrogen gas react with 1 mole of oxygen gas to give 2 moles of water as a product.
From the balanced chemical reaction we conclude that,
As, 1 mole of oxygen gas react to give 2 moles of water.
So, 2.2 mole of oxygen gas react to give
moles of water.
Thus, the number of moles of water produced are, 4.4 moles.