Question

activity 2
another student places a bowl on a laboratory scale and puts some ice cubes into the bowl.
she leaves the bowl of ice cubes on the scale for 15 minutes.
activity 3
a third student places two flasks on a laboratory scale. next, she adds 20 g of baking soda
into one flask and 50 g of acetic acid into the other flask. she then pours the acetic acid into
the flask that contains the baking soda.

1. which graph represents the total mass of the substances before and after they are stirred

together in activity 1?

Explanation:

Step1: Analyze Activity 1

In Activity 1, when water and sugar are mixed (a physical change), the total mass remains the same. The initial mass after adding water and sugar is \(370.0\) g, and after stirring (no mass is lost as it's a physical mixing), the mass is still \(370.0\) g.

Step2: Analyze Graphs

• Graph A: Mass changes from a lower value before to a higher value after. Incorrect as mass should be conserved.
• Graph B: Mass changes (different values before and after). Incorrect as mass should be conserved.
• Graph C: Mass is the same before and after (\(300\) g - assume the scale in the graph represents the conserved mass concept as per Activity 1's mass conservation).

Answer:

C.