Suppose that a different student obtained reaction rates for the particle-size experiment, and that
these rates did not show a pattern. Check all
possible sources of this error.
Some of the broken tablet was not added to
the water.
The tablet was not crushed enough to make
a substantial difference.
The size of the reaction beaker was varied.
The tablets were not uniform in their mass.
DONE

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 

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Contained in chromosomes which are located in the nucleus of the cell.

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