Integrated Science
Class 9G1
HOMEWORK
Chapter 2.3 – Uncertainty in Data
Student name: ___________
Q1. _________________ is how close a series of measurements are to one another.
Q2. _________________ how close a measured value is to an accepted value.
Q3. Ahmed conducted an experiment to find the density of Copper to be 8.94 g/cm3. He
got the following values:
10.1 g/cm3 , 10.15 g/cm3, 9.99 g/cm3
Were Ahmed’s values precise, accurate, both precise and accurate, or neither precise nor
accurate? Give reason.
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Q4. Salma conducted an experiment to find the density of sucrose (1.59 g/cm3). Her trial
values are recorded in the table below.
a. Find the error and percent error.
Trial
Salma’s
experimental Value
Trial 1
1.54 g/cm3
Trial 2
1.60 g/cm3
Trial 3
1.57 g/cm3
Error
Percent Error
b. Which trial is the closest to the accepted value?
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Q5. Calculate the volume of the book with dimensions: length = 28.3 cm, width = 22.2 cm,
height = 3.65 cm. (note: remember to round the answer as per the rules)
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Submitted to Ms. Wafa Qamer Bhatti