Lily is trying to find the deneity of her pencil. She places it on the scale and notes that it is 15g Since it has an irregular shape she decides to use the displacement method with a graduated cylinder to get the volume. The water line moves from 30mL to 35mL, so the determines that the density of her pencil is 5g/mL What did she do wrong? Nothing her answer is correct She uned a scale to get the mass instead of a graduated cylinder I She forgot to find the pencil's length before putting it in the water She needed to use the volume from the displacement to calculate density

## Step 1<br />The problem involves the concept of density, which is defined as mass per unit volume. The formula for density is:<br />### **Density = \(\frac{Mass}{Volume}\)**<br /><br />## Step 2<br />Lily correctly measured the mass of the pencil using a scale, which is 15g. However, she made a mistake in calculating the volume of the pencil.<br /><br />## Step 3<br />Lily used the displacement method to measure the volume of the pencil. The displacement method involves measuring the volume of water displaced by the object. In this case, the water level in the graduated cylinder rose from 30mL to 35mL, indicating that the volume of the pencil is 5mL.<br /><br />## Step 4<br />However, Lily made a mistake in calculating the density. She divided the mass of the pencil (15g) by the volume of the pencil (5mL), which is not the correct method. The correct method would be to divide the mass of the pencil (15g) by the volume of the pencil (35mL - 30mL = 5mL).