HELPPP 1. How many joules does it take to melt 100 grams of ice in liquid water?And is it
endothermic or exothermic

2. How much heat is needed to convert 500 g of water to boiling steam? And is it
endothermic or exothermic

3. How much heat will 1000 g of water give off when frozen? And is it
endothermic or exothermic

4. How much heat is emitted when 800 g of boiling steam is condensed? And is it
endothermic or exothermic

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

It would be true sodium reacts with water in a violent way 

Ithink ahopefully im correct