Answer:
A
Explanation:
The dissolving process depends on the interaction between solute and solvent (solvation) and the breaking up of the intermolecular bond between solutes. The former is exothermic in nature, while the later is endothermic. Energy is released when solute-solvent particles interact. When this energy exceeds the energy required to break intermolecular bonds between the solute particles, dissolution is exothermic.
Answer:
include quartzite and marble
Explanation:
non-foliated rocks are
1. metamorphic rocks
2. they are formed in the surrounding of igneous rocks
3. The environmental condition of formation of non-foliated rocks are that temperature is very high
4. pressure is very low but equal from all direction on igneous rocks
5. The constituent material crystalizes to form large rocks in which atoms are tightly and closely packed. Due to this density of these rocks are also higher.
Example of such rocks are
Quartzite : Its constituent material are mineral quartz and metamorphosed sandstone
Marble : its constituent material are mineral calcite; metamorphosed limestone
Hence, include quartzite and marble is the correct choice.
Answer:
a)decrease
b)increase
c)smaller
d)smaller
Explanation:
Ionization energy decreases down the group due to increase in the atomic radius. The distance between the outermost electron and the nucleus increases hence the nuclear attraction for the outermost electrons become smaller and the ionization energy also become smaller as electrons are now easily removed from the outermost shell.
Hence the group of answer choices provided above.
Answer:
<h3>answer is A some second row elements may have 7 or fewer valance electron</h3>
Explanation:
<h3>because as we know second row elements are from Li up to Ne; their atomic number is from 3 - 10 and when we work their electron configuration only the inert gas neon have 8 valance electrons ; the others have 7,6,5,4,3,2,1 from F up to Li respectively so the statement is true </h3><h3>other alternatives like b it is not true because there is one element only having 8 valance electrons so it is not true</h3><h3>D and C are not true because outer most shell cannot occupey more than 8 electrons because of that those elements cannot have more than 8 valance electrons</h3>
<h3>I think it is help ful for you </h3>
Answer: The molarity of a solution made by dissolving 12.6 grams of NaNO3 to make 200 ml of solution is 0.74 M
Explanation:
Molarity is defined as the number of moles of solute dissolved perliter of the solution.

where,
n= moles of solute
= volume of solution in ml = 1000 ml

Now put all the given values in the formula of molarity, we get

Thus the molarity of a solution made by dissolving 12.6 grams of NaNO3 to make 200 ml of solution is 0.74 M