Question

Some students investigated the effect of sucrose concentration on the change in mass of beetroot chips. A beetroot chip was weighed, immersed in water for 30 minutes and then reweighed. This was repeated using five more beetroot chips and five different concentrations of sucrose solution. some of the results are shown below. Chip 5: Concentration of sucrose solution mol per dm3 = 0.8 Starting mass of the chip = 2.15 End mass of the chip= 1.84 (i) Calculate the percentage change in mass for chip 5. Give your answer to an appropriate number of decimal places. (3)

Answer 1

To calculate the percentage change in mass for chip 5, you can use the following formula:

Percentage Change in Mass = [(End Mass - Starting Mass) / Starting Mass] * 100%

Now, plug in the values:

Percentage Change in Mass = [(1.84 g - 2.15 g) / 2.15 g] * 100%

Calculate the numerator first:

Numerator = (1.84 g - 2.15 g) = -0.31 g

Now, plug in the numerator value:

Percentage Change in Mass = [(-0.31 g / 2.15 g)] * 100%

Now, perform the division:

Percentage Change in Mass = (-0.31 / 2.15) * 100%

Percentage Change in Mass ≈ -14.4186%

Rounded to an appropriate number of decimal places, the percentage change in mass for chip 5 is approximately -14.42%.