(a)
Interpretation:
The magnitude of uncertainty has to be identified for 317.
Concept Introduction:
Whenever a measurement is made, there is always a degree of uncertainty or error. For example, when an object is measured with a scale having graduations in centimeter, and if the length of the object falls between 5 and 6, the estimated length would be 5.2 cm. But this value is approximate. This is called the uncertainty error. If the same scale is graduated in tenths of a centimeter, the measurement made would be with less degree of uncertainty. Hence if the markings become smaller lesser is the degree of uncertainty. The magnitude of measurement and uncertainty of measurement are the two most important information to be conveyed in order to show case the values more exact. The significant figures any measurements are said to convey the uncertainty, while the digit values convey the magnitude.
(b)
Interpretation:
The magnitude of uncertainty has to be identified for 317.0.
Concept Introduction:
Whenever a measurement is made, there is always a degree of uncertainty or error. For example, when an object is measured with a scale having graduations in centimeter, and if the length of the object falls between 5 and 6, the estimated length would be 5.2 cm. But this value is approximate. This is called the uncertainty error. If the same scale is graduated in tenths of a centimeter, the measurement made would be with less degree of uncertainty. Hence if the markings become smaller lesser is the degree of uncertainty. The magnitude of measurement and uncertainty of measurement are the two most important information to be conveyed in order to show case the values more exact. The significant figures any measurements are said to convey the uncertainty, while the digit values convey the magnitude.
(c)
Interpretation:
The magnitude of uncertainty has to be identified for 3.170.
Concept Introduction:
Whenever a measurement is made, there is always a degree of uncertainty or error. For example, when an object is measured with a scale having graduations in centimeter, and if the length of the object falls between 5 and 6, the estimated length would be 5.2 cm. But this value is approximate. This is called the uncertainty error. If the same scale is graduated in tenths of a centimeter, the measurement made would be with less degree of uncertainty. Hence if the markings become smaller lesser is the degree of uncertainty. The magnitude of measurement and uncertainty of measurement are the two most important information to be conveyed in order to show case the values more exact. The significant figures any measurements are said to convey the uncertainty, while the digit values convey the magnitude.
(d)
Interpretation:
The magnitude of uncertainty has to be identified for 0.0317.
Concept Introduction:
Whenever a measurement is made, there is always a degree of uncertainty or error. For example, when an object is measured with a scale having graduations in centimeter, and if the length of the object falls between 5 and 6, the estimated length would be 5.2 cm. But this value is approximate. This is called the uncertainty error. If the same scale is graduated in tenths of a centimeter, the measurement made would be with less degree of uncertainty. Hence if the markings become smaller lesser is the degree of uncertainty. The magnitude of measurement and uncertainty of measurement are the two most important information to be conveyed in order to show case the values more exact. The significant figures any measurements are said to convey the uncertainty, while the digit values convey the magnitude.
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Chapter 2 Solutions
General, Organic, and Biological Chemistry
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- For the pin shown in Fig. 2.5, why is the third figure determined for the length of the pin uncertain? Considering that the third figure is uncertain, explain why the length of the pin is indicated as 2.85 cm rather than, for example, 2.83 or 2.87 cm.arrow_forwardAn electric current of 21.50 A flows for 21.0 minutes. Calculate the amount of electric charge transported.. Be sure your answer has the correct unit symbol and 3 significant digits. 7 x10 •O U 89 Sarrow_forwardWhich choice best describes the degree of uncertainty in the measurement 16.30 g? O The uncertainty cannot be determined without additional information. The quantity is exact. +1.00 g +0.01 g ±0.10 garrow_forward
- Calculate the density and the uncertainty of an Al cylinder using the following data. Metal AI Mass (g) 17.7620 Length (cm) 5.18 Diameter (cm) 1.31 Assume experimentally measured quantities have uncertainties of ±1 of the most precise digit. PAI 4.0 2.55 g/cm3 + 49 g/cm3arrow_forwardFind the difference between the value of x2 and the sum of x1 plus x3.; let x4 be equivalent to the sum of x1 and x3 and let x5 be the difference between x2 and x5. This calculation scheme is shown below. Make notes about any similarities or differences between the values in your notes. x4 = x1 + x3 x5 = x2 – x4 Data Analyis This section will include all data collected during the lab. Thermochemical Data Tinitial (°C) Tfinal (°C) ΔT (°C) moles NaOH qreaction (kJ) ΔHrxn Reaction 1 25.0 30.3 +5.3 0.025 -1.11 -44.4 Reaction 2 25.0 37.0 +12.0 0.025 -2.51 -100.4 Reaction 3 25.0 31.7 +6.7 0.025 -1.40 -56.1 Reaction 1: NaOH(s) → Na+(aq) + OH-(aq) + x1 kJ 1g /39.977g/mol = 0.025 moles Moles NaOH = 0.025 qsolution = (4.184 J/g °C) (50.0g) (30.3°C -25.0°C) = -1108.76 J/ 1000 qreaction (kJ) = -1.11 kJ ΔH = -1.11 kJ/ 0.025 moles ΔHrxn = -44.4 kJ/mol…arrow_forwardPlease don't provide handwritten solution ...arrow_forward
- Student A measures an object and records a value of 1.5 cm. Student B measures the same object and records a value of 1.50 cm. They have both done their measurements correctly. Why do these measurements differ?arrow_forwardWallie weighed 3 different cylinders that all looked the same. He noticed that the masses were all different and wondered how much they deviated from the average. Determine the average deviation, in g, of the cylinder masses below. Cylinder Mass (g) 1 31.8 2 31.39 3 31.96arrow_forwardAccuracy and precision are two important factors to consider when taking data measurements and they refers to the agreement between experimental data and a known value. O True False O Oarrow_forward
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