Step 1: Identify the concept.
This is an example of **satisfaction of wants** using **consumer goods**. The chalk is the good used by Sunita to satisfy her want to write on the blackboard.
Step 2: Explanation.
Sunita's want for writing on the board is fulfilled by using chalk, a consumer good designed for this purpose.
Step 3: Conclude.
Thus, Sunita used chalk, a consumer good, to satisfy her want of writing on the blackboard.
Final Answer: \[ \boxed{Satisfaction \; of \; Wants \; using \; Consumer \; Goods} \]