The statement about electronegativity that is correct is <span>D. Noble gases have the highest electronegativity values.</span>
Answer:
the reactivity of alkaline earth metals increases from top to the bottom of the group, that's because the atoms get bigger from the top to the bottom so the valence electrons are farther from the nucleus.
The boiling of water and sublimation of iodine crystals are endothermic processes.
Answer: Option B & C
Explanation:
Endothermic process are the classifications of chemical reactions where the heat is absorbed by the system from the surroundings. As the matters can exists in three phases like solid, liquid and gases.
The endothermic process occurs by absorption of heat energy by the system. So according to the given options, the boiling of water and iodine crystal sublimation follows endothermic process. In the boiling of water occurs when the water molecules absorb heat from the surrounding and convert to gas phase.
Similarly, the sublimation of iodine crystals also require heat energy from the surrounding to break the bonds of the iodine crystals to sublimate to gas phase. Thus the boiling of water and sublimation of iodine crystals are the examples of endothermic processes.
Answer : The pressure of 
is 0.975 atm.
Solution : Given,
Mole fraction of = 0.25
Mole fraction of 
= 0.65
Mole fraction of 
= 0.10
Total pressure of mixture = 3.9 atm
According to the Dalton's law of partial pressure, which tells that the partial pressure of a gas is directly proportional to the mole fraction of a gas.
where,
= partial pressure of a gas
= mole fraction of a gas
= total pressure of gas
Now we have to calculate the partial pressure of gas.
Put all the given values in above formula, we get
The partial pressure of is 0.975 atm.
Answer:
Cell division creates an equal number of cells in different parts of the body.
Explanation:
Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle.
