Explain the difference between random error and systematic error.

4. Calculate the error and percent error of a sample of water using the following data: the actual density of water at 23 °C is 0.999765 g mL-1 and the experimental density (at 23 °C) is 1.097 g mL-1. Show your work and watch your significant figures. O, Focus a

1. A student wanted to find the density of an object of unknown composition with a volume of 5.50 0.05 cm³. The mass of the object was 19.255 0.005 g. What is the density of the object, including the absolute uncertainty? a. 3.500 ± 0.3 g cm³ b. 3.500 ± 0.03 g cm? c. 4.259 ± 0,6 g cm¹ d. 4,259 ± 0,06 g cm³

6. Use the following data to calculate the molar mass of naturally occurring silicon: Isotope             Isotopic Molar Mass                  Abundance 28Si                   27.97693 g/mol             92.23% 29Si                   28.97649 g/mol             4.67% 30Si                   29.97376 g/mol             3.10%

8 cm3 = __________ L Group of answer choices .0227 22.7 57800 .0578

A measurement of the mass of a specimen was determined to be 4.203 plus or minus  0.001 g. What is the fractional uncertainty in the mass?

Plot the data appropriately on a properly formatted graph. Formatting should include descriptive title, axes labels with units, major grid lines marked, proper scaling, and a best fit line (use a ruler).

Why should the selected rule(s) be followed? Weighing wet items will cause the displayed mass to be greater than the actual mass of the object. A residue left on the balance will contaminate the balance pan surface and anything that comes into contact with it afterwards. Objects at any temperature other than room temperature can create air currents which can affect the balance pan, causing the measured mass to be higher or lower than the true mass. There may be discrepancies in accuracy between individual balances.

What is the only way to reduce random error in measurements?

8. L0s t213.15= 318.18K 2. A woman is 5 ft 5 in tall and weighs 140 lb. Express these values in the SI system (m, kg)