Which of the following molecules has correctly labeled bond dipoles?
Answers
Answer: The molecule identified with the letter C. HFO.
Explanation:
1) In covalent bonds, the dipolesare identified with an arrow pointing from the least electronegative element toward the most electronegative element.
2) The molecule HFO is formed by one covalent bond between H and O, and other covalent bond between F and O.
3) O is more electronegative than H, so in the H-O bond the dipole is identified with the arrow from the H atom toward the O atom. That is correctly indicated in the drawing C, in this way:
-|----→
H - O
4) F is more electronegative than O, so in the O-F bond the dipole is identified with an arrow from the O atom toward the F atom. That is correctly indicated in this way:
-|---→
O - F.
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insoluble because most Na+1 compounds are insoluble in water
soluble because all S−2 compounds are soluble in water
insoluble because there are no water soluble S−2 compounds
Answers
Answer: Option (a) is the correct answer.
Explanation:
Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. Whereas atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6.
So, when both sodium and sulfur chemically combine together then it results in the formation of an ionic bond due to transfer of an electron from sodium to sulfur atom.
Sodium changes into by losing an electron and sulfur changes into
by gain of two electrons from two sodium atoms.
As it is known that water is a polar solvent and all ionic substances will dissolve in water.
Therefore, we can conclude that when the compound, , is mixed with water, the
is soluble because all
compounds are soluble in water.
When the compound, Na2S, is mixed with water, the Na2S is soluble because all Na+1 compounds are soluble in water. The rest of the choices do not answer the question above.
c. external conflict.
b. climax.
d. internal conflict.
Answers
FALSE
Answers
Answer:
FALSE
Explanation:
Critical temperature can be defined as the temperature at which a substance can exist as a liquid. Below the critical temperature, the substance will freeze and above the critical temperature, the substance will evaporate.
Note: Liquid cannot evaporate below it's critical temperature
Answers
Example : Barium chloride , barium hydroxide, barium carbonate,barium sulfate.
hope this helps!
Energy can enter or leave the system but matter cannot.
Heat and matter are both able to enter or leave the system.
Matter can enter or leave the system but energy cannot.
Heat and matter can enter the system but cannot leave the system.
Answers
Answer: Option (b) is the correct answer.
Explanation:
An open system is defined as the one where there will occur exchanges of matter as well as heat energy between the system and surrounding.
For example, when a boil water then its heat energy will move into the surrounding and also matter is moving to the surrounding in the form of water vapor or steam.
On the other hand, a system in which there will occur no exchange of matter but exchange of heat will occur from the system to the surrounding is known as a closed system.
For example, coffee placed in a cup covered with lid is a closed system.
Thus, we can conclude that the statement heat and matter are both able to enter or leave the system best expresses the definition of an open system.