Classify the statements based on whether they describe the method of standard addition, internal standards, or external standards. You are currently in a sorting module. 1. It is the method of choice when the matrix of the sample may affect the signal.
2. Known quantities of the analyse are added to the unknown.
3. A known amount of a standard, different from the analyte, is added to the unknown.
4. It consists of a series of standard analyte solutions separate from the unknown.
5. It is the method of choice when the instrument response or amount of sample analyzed varies from run to run.
6. It is used to meure the instrument responses a function of a known analyte concentration under a set of conditions.
A. Standard addition
B. Internal standards
C. External standards

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