- Name the compound CO(NO3)2.
A Cobalt (1) nitride
B Cobalt (I) nitrate
C Cobalt nitrite
D Cobalt (II) nitrate
- The type of eedback that increases or enhances the effects of the variable is:
A) neutral.
B) negative.
C) positive.
D) responsive.
The Correct Answer and Explanation is :
- Correct Answer: D) Cobalt (II) nitrate
The compound CO(NO3)2 consists of cobalt (Co) and nitrate (NO3) ions. The cobalt ion is in the +2 oxidation state, indicated by the “(II)” in the name, and nitrate is a polyatomic ion with a -1 charge. To balance the charges, two nitrate ions are needed for every cobalt ion. This compound is named as “Cobalt (II) nitrate” because cobalt has a +2 charge, which is denoted by the Roman numeral (II) after the metal in the name.
- Cobalt (I) nitride would refer to cobalt in the +1 oxidation state, which is not the case here.
- Cobalt nitrite would imply cobalt in a lower oxidation state (not specified), and the ion involved would be the nitrite ion (NO2−), not nitrate (NO3−).
- Cobalt (II) nitrate is the correct name, as it accurately reflects the cobalt ion in the +2 oxidation state and the nitrate ion.
- Correct Answer: C) Positive
Positive feedback refers to a type of feedback mechanism that amplifies or enhances the effect of a stimulus. In a positive feedback loop, the initial change or stimulus is intensified or accelerated, which leads to a greater response. This mechanism can be seen in several biological processes, such as blood clotting or the release of oxytocin during childbirth, where the body increases the intensity of a process until a specific outcome is achieved.
For example, in the case of childbirth, when the baby’s head presses against the cervix, it stimulates the release of oxytocin, which intensifies the contractions, pushing the baby further down. This increased contraction stimulates more oxytocin release, thus continuing the process until the baby is born.
In contrast, negative feedback works to reduce the effects of a stimulus or return a system to its equilibrium state. For instance, the regulation of body temperature is a negative feedback process, where the body works to bring temperature back to normal levels when it deviates.
Thus, positive feedback accelerates the response to an initial change, whereas negative feedback helps maintain stability and balance.