Answer:
Melting point
Explanation:
Pure substances have sharp melting and boiling points while impurities lower the melting point and raise the boiling point
<u>Answer:</u> The mole ratio of H : O in ammonium nitrate is 4 : 3.
<u>Explanation:</u>
We are given a compound named ammonium nitrate having formula 
There are 3 elements in this compound which are nitrogen, hydrogen and oxygen.
To calculate the mole ratio, we write the ratio of their subscripts. For this compound, it is:

The mole ratio of H and O for this compound is 4 : 3.
The sun heats up the air at different rates. Weather is caused by uneven heating
Answer: 2= baby being developed= embryo 1 i dont know sorry
Explanation:
Sodium chloride because it contains the most reactive metal(sodium) and most reactive non-metal(chlorine).