Answer:
a partial negative charge
Explanation:
The oxygen on water molecules carries a partial negative charge on it. Water is made up of oxygen and hydrogen bonded via polar covalent bonds.
This bond involves the attraction between two atoms that shares their valence electrons in covalent bonding. The oxygen atom is more electronegative with more affinity for the shared electron. This suggests that it will pull the shared electrons more closer than the hydrogen atom.
This pull due to electronegativity difference leaves a partial negative charge on oxygen and a partial positive charge on hydrogen.
Answer: Two answers apply to physical change:
1-Condensation of Ethanol
2-Evaporation of Ethanol
Explanation:
Physical and Chemical changes are two very different types of change. However, both processes are possible because of the same thing: the investment of energy.
Physical change requires a lower investment of energy and this is the reason why these kind of changes can be reverted and the molecular structure of the matter does not change.
For example: I can easily change the state of water with fire or a fridge, and go from ice to liquid to vapor and back as many times I want. This is possible because I'm not giving enough energy to break or modify bonding forces inside the molecule of water, but enough energy to modify the interaction between two different molecules of water.
This is why Ethanol can be evaporated and then condensated into liquid again, representing this physical changes.
Chemical change, on the other hand, requires a higher investment of energy and because of this is that the bonds between atoms inside a molecule can be affected (bonds between atoms in the molecule are stronger). Therefore, when the molecules themselves are modified, the matter is transformed from a compound into a new one. This is why glucose becomes carbon dioxide, ethanol or carbon. These three compounds appear when the bonds between Carbons in the glucose are broken.
Answer:
17.03052 g/mol
Explanation:
Ammonia formula is given as NH3.
To estimate the molar mass of any compound, we have to add up the molar masses of every atom of the given compound. Ammonia comprises of one nitrogen atom and three hydrogen atoms.
So the molar mass of ammonia is
N: 14.0067 g/mol
H: 1.00794 g/mol
The molar mass of ammonia will thus be
14.0067 g/mol +3× 1.00794 g/mol =17.03052 g/mol
It will produce high concentration of hydrogen ions if acid ionises completely in water.
A.
Particles and energy in a system become more and more disordered.