Dr. Martin is an ophiologist, or a scientist who studies snakes. During one experiment, Dr. Martin fed a snake a whole mouse and compared the mass of the snake before it consumed the mouse to the snake's mass immediately after it was fed. According to the law of conservation of mass, how should the masses compare? A. The mass of the snake after feeding should be equal to the original mass of the snake plus the mass of the mouse. B. The mass of the snake after feeding should be equal to the mass of the mouse. C. The mass of the snake after feeding should be the same as the original mass of the snake. D. The mass of the snake after feeding should be equal to the original mass of the snake minus the mass of the mouse.

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 

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.