Answer:
Oxygen- 6
Calcium-2
Nitrogen-5
Aluminum-3
Flourine-7
Explanation:
A Lewis structure or dot electron structure is a representation of an atom in which the valence electrons on the outermost shell of the atom are represented as dots.
These dots show the number of valence electrons as well as the group to which the atom belongs in the periodic table.
The question is incomplete, the complete question is;
when two colorless solutions of ionic compounds are mixed, and the final mixture remains colorless. What type of a change does this represent? Select from the options below The information provided is insufficient for determining the type of change Physical change because the absence of color change indicates that there is no change in chemical composition of the mixture B Chemical change because the absence of color change indicates that there is a change in chemical composition of the mixture
Answer:
The information provided is insufficient for determining the type of change
Explanation:
A chemical change is one in which new substances are formed. Chemical changes are not easily reversible and they are often accompanied by evolution or absorption of heat.
A physical change does not lead to the formation of new substances. It is easily reversible.
Change in colour alone can not tell us whether a physical or chemical change has taken place. This is because colourless, miscible substances may have been formed in the process hence the final mixture remains colorless.
It is also possible that the two solutions were merely physically mixed. This is a physical change,
Therefore, the information provided is insufficient for determining the type of change.
Answer:
D: Increasing the amount of water.
Explanation:
Choice A: increasing the pressure can force the liquid to stay a liquid and affect the boiling point (decrease it).
Choice B and C: both involve colligative properties, adding a solute to water will increase the boiling point of water.
Choice D: just having more water does not change the boiling point of the water as this minimize the effect of any external factor.
<em>So, the right choice is: D: Increasing the amount of water.</em>
Hg2O -> O2 + Hg
2Hg2O -> O2 + 2Hg
20g-> ?g + 18.6g
(1 molHg2O ) (1 mol O2) (32g O2)
20g 2Hg2O x ------------------- x ------------------- x -------------- = 0.77g O2
(834.36Hg2O) (1 mol Hg2O) (1 mol O2)