Answer:
Both, the comb and the hair are comprised of atoms, which are, on their part, comprised of electrons ( negatively charged particles). When Sandra combs her hair, friction between comb and hair occurs. Since the electrons in hair are more loosely connected to each other than the ones in comb, during this friction some electrons from the hair will be transferred to the comb. Since electrons are negatively charged and the comb now has excess electrons that means that the comb becomes negative and the hair becomes positive ( because it loses negative charge). This friction is responsible for charging the hair and the comb. Finally, when the comb is placed near the hair, hair will move toward the comb since the opposite charges attract.
Answer:
The middle Hydrogen atom is bonded to two instead of one atom
Oxygen is bonded to one instead of two atoms
Oxygen has three instead of two lone pairs of electron.
Explanation:
If we look at the structure, we will notice that it does not satisfy the basic principles of valency.
Hydrogen has a valency of 1. However, the middle hydrogen atom is bonded to two atoms instead of only one atom - the other atom of hydrogen and an atom of oxygen.
Secondly, oxygen has three lone pairs instead of two lone pairs, hence it is bonded to only one instead of two atoms. This does not correspond to the known valency of oxygen.
Answer:
Option E
RbCL<CH3OH< CH3Cl< CH4
Explanation:
The boiling temperature of an organic compound increases with the increase in number of carbon atoms and hence as the length of the hydrocarbon chain increases the boiling temperature also increase due to increase in force of attraction between the molecules. Also presence of strong molecules such as OH – COOH also increases the boiling temperature while Cl and other elements with high electronegativity reduces the boiling temperature
Hence, the correct order of increasing boiling temperature is option E
RbCL<CH3OH< CH3Cl< CH4
(20*1000)÷(molecular weight of H3po4*50)
Answer:
1. spontaneous
2. spontaneous
3. Not Spontaneous
4. Not Spontaneous
Palladium and Sn^4+ can be reduced by hydrogen.
Explanation:
If we look at the electrochemical systems represented above, we will notice that in the first two cells, the metal should be reduced looking at the positive electrode potential of the process. This means that hydrogen can reduce the both metals. Electrons flow from the H2(g)/H^+(aq) half cell to the metal/metal ion half cell.
Similarly, when the standard electrode potential is negative, electrons flow from the metal/metal ion electrode to the hydrogen electrode.
Based on the reaction equations, a process is spontaneous if it gives a positive E°cell hence the answers above.