3 students measure the mass of a product from the same chemi

3 students measure the mass of a product from the same chemical reaction. The groups recorded data of 8.83g, 8.84 g and 8.82 g. The known mass of the product from that reaction is 8.60g. The group values are___. Why? A small can is measured by Ail and Khalid. Their measurements are 10.2 g and 10.4 g respectively. If the true value is 10.5 g. find the true of the true error of Khalid measurement?

Solution

Solution :1)

Accuracy refers to the closeness of a measured value to a standard or known value.

Precision refers to the closeness of two or more measurements to each other.

Here we know that the actual mass of the subtance is 8.60 g.

But student recorded data closest to 8.60.

there fore the group values are PRECISE .

Solution ii)

True error = True value - approximate value.

First step to find true error for Ali\'s measurement ,

True error = 10.5 -10.2 = 0.3

The ratio of true error for Ali\'s measuement to the true error for Khalid measurement is

True error for Ali\'s measurement = 0.3

Second step to find true error for Khalid measurement

Trur error = 10.5 -10.4 = 0.1

Third step to find the ratio of true errors which is 0.3 / 0.1 = 3

therefor the ratio of true error of Ali\'s measurement to the true error of Khalid measurement is 3.