The author organized this passage by a comparing and contrasting the different types of energy. b describing a problem and explaining how to solve it. c sequencing the changes that energy goes through. d illustrating the law of conversation of energy with examples -reading science-energy transformation 5.6a uses of energy

Cr(oh)3 -> cr(3+) + 3oh-

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 

Where is the following?

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged