Final answer:
The extra volume in the mixture of chocolate syrup added to ice cream comes from the syrup itself. The addition of the chocolate syrup may decrease the density of the ice cream.
Step-by-step explanation:
The extra volume in the mixture of 6 L of chocolate syrup added to 50 L of ice cream comes from the chocolate syrup itself. When the chocolate syrup is added to the ice cream, it increases the overall volume of the mixture. However, it's important to note that the density of the mixture may change due to the addition of the syrup.
The addition of chocolate syrup may decrease the density of the ice cream. Density is defined as mass divided by volume, and since the chocolate syrup has a higher mass than the same volume of ice cream, adding it to the mixture would result in a higher total mass and a larger volume. Therefore, the density of the ice cream would decrease after adding the chocolate syrup.