In a chemical system, inter- and intra-molecular forces of interactions are operable. Intramolecular forces are the forces that hold atoms together within a molecule, while intermolecular forces are forces<span> that exist between molecules. Thus, it is intermolecular forces of attraction which holds two or more molecules together.
intermolecular forces are of following types
1) Dispersion
2) Dipole-Dipole interaction
3) Ion-Dipole Interaction and
4) Hydrogen bonding.
In case of water, it is Hydrogen bonding which is responsible for holding molecules together.
With reference to hydrogen bonding, it must be noted that it</span><span> is an </span>electrostatic<span> attractive interaction between hydrogen atom that is bonded to
</span>electronegative<span> atom (such as </span>nitrogen<span>, </span>oxygen<span>, or </span>fluorine)<span> and another atom, adjacent to it, which has </span>lone pair<span> of electrons.
In case of water, hydrogen atom of one water molecule interacts with lone pairs of electrons present on oxygen atom of other water molecule.</span>
Answer:
0,727 mL
Explanation:
We add x mL of the 95% ethanol solution to 1 mL: C1=0,95 and V1=x mL
As we already had 1 ml of solution, now we'll have (1 + x) mL of the 40% ethanol solution: C2=0,4 and V2=1+X mL
Now, using the C1V1=C2V2 equation:
(0,95)x=0,4(x+1)
0,95x=0,4x + 0,4
0,95x-0,4x=0,4
0,55x=0,4
x=0,4/0,55=0,727 mL
Therefore, we need to add 0,727 mL of a 95% ethanol solution to the enzyme solution to obtain a final concentration of 40% ethanol.
Answer: C) Elements and pure compounds are homogeneous materials because they have a uniform composition throughout.
Explanation: Element is a pure substance which is composed of atoms of similar elements. Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.
Elements are compounds form homogeneous materials as they have uniform composition throughout and the components are evenly distributed throughout the material.
Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material.
Answer:
I think C ,correct me if I'm wrong
Answer:
Deer, Eagle, Raccoon, frog, turtle, fish, dragonfly.
Explanation:
They interact from the life cycle they eat each other...
