Na has a +1 charge, and O has a -1 charge.
Answer:
Between -195°C to -215°C
Explanation:
We begin from this data:
P under -220°C will be solid, because -220°C is the freezing point.
Above -220°C, P will be at liquid state.
Then -185°C is the boling point, so above that temperature we have P as a gas.
Between -175°C to -210°C
Above -185°C we said that P is gas, so at -175°C P is not liquid. This state is F.
Between – 190°C to -225°C
At -190°C, we can have P as liquid, but -225°C is under -220°C, where P changes from liquid to solid. Then, this state is also F.
Between -200°C to -160°C
Above -185°C we said that P is gas, so at -160°C P is not liquid. This state is also F. The same, as the first situation.
Between -195°C to -215°C
-195°C is a lower temperature than -185°C. P is still liquid, we did not get the boiling point yet. -215°C is higher than -220°C, P is also liquid. There are still 5°C until P completely freezes. <em>This is the correct choice.</em>
When 2.50 g is burned then in oxygen then 1.25kj of heat is produced.
Basically the sugar breaks down until it’s eventually evaporated and spreads to different parts of the water solution and while it’s spreading the chemicals and the flavors in the sugar are going into the molecules and atoms in the water and mixing to make the water solution taste sweet just like sugar. So i would say it would be a physical change not a chemical change.