Answer:
Because for dilute and aqueous solutions the mass of solvent will be a very close value to the volume of solution.
Explanation:
Molar concentration is defined as:
![[M]=\frac{molessolute}{volumesolution}](https://tex.z-dn.net/?f=%5BM%5D%3D%5Cfrac%7Bmolessolute%7D%7Bvolumesolution%7D)
And molal concentration is defined as:
![[m]=\frac{molessolute}{kgsolvent}](https://tex.z-dn.net/?f=%5Bm%5D%3D%5Cfrac%7Bmolessolute%7D%7Bkgsolvent%7D)
And:
Msolution=Msolute+Msolvent
For <em>dilute solutions</em>, we have small amounts of solute, then we have:
Msolution=Msolute+Msolvent, and as the mass of solute is very small: Msolution≅Msolvent
If the solution is <em>also aqueous</em> (water as solvent), and considering that the density of water is around 1 gm/cm3 or 1 kg/m3:
Msolvent≅Msolution≅Vsolution
Therefore, if we look to the molar and molal equations, we have the same numerator in both (moles of solute) and nearby numbers for the denominator, giving to the molar and molal concentration close values.
The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound
Answer:
Visible light contains all the colors from violet to red. An object gets its color when electrons absorb energy from the light and become “excited” (raised to a state of increased energy). The excited electrons absorb certain wavelengths of light.
The Sun emits light of every possible frequency at once, including at frequencies too high or too low for us to see. But the Sun's highest intensity radiation aligns approximately with our visible range – red through blue. That's no coincidence – like all animals on Earth, we have evolved to make best use of the light available.
Explanation:
Answer:
When breaking a chemical bond, energy is absorbed by the chemical bond.
Explanation:
Chemical bonds are the forces of attraction that joins two chemical species. There are two types of chemical bonds: Strong Primary and Weak Secondary bonds.
When a chemical bond is formed between two species, it is accompanied by the release of energy. Therefore, <em>bond formation is an exothermic process</em>.
<u>However, energy is always required to break a chemical bond. As energy is needed to overcome the attractive forces present between the two species.</u> Therefore, <em>bond dissociation is an endothermic process.</em>
<u><em>Therefore, during bond dissociation, energy is absorbed by the chemical bond.</em></u>