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MATS1101 - Engineering Materials and Chemistry - T3 2025

MATS1101 - Engineering Materials and Chemistry - T3 2025

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How do you measure the 5 mL of 2 M nitric acid which is added to the 100 mL volumetric flask in step 3?

Using a 10 mL graduated pipette.

Using a dispenser on the top of the bottle.

Using a 10 mL measuring cylinder.

Using a 100 mL measuring cylinder.

Using a 5 mL pipette.

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The concentration of Fe³⁺ in the stock haematite solution is large and if it were mixed with KSCN the light absorbance would be too large to accurately measure. How is this problem avoided in the method for this experiment?

A very small volume (< 0.1 mL) of the stock haematite solution is used to directly prepare the solution for the spectrophotometer.

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1 mL of the final solution after adding the KSCN is diluted with water in the spectrophotometer cell.

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The stock haematite is diluted in a 250 mL volumetric flask, and 10 mL of this solution is used to prepare the 100 mL of solution for the spectrophotometer.

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10.0 mL of a solution of Fe³⁺ was placed in a 100 mL volumetric flask. 5mL of nitric acid and 5 mL of KSCN solution were added. Water was added to make the solution up to the mark on the neck of the volumetric flask, and the solution was thoroughly mixed. The concentration of the solution in the volumetric flask was determined to be 0.00222 mol/L by spectrophotometry. What was the concentration of the original Fe³⁺ solution?

What are the quantities plotted on the calibration graph for the spectrophotometry experiment you will be doing?

the y-axis is SCN^- concentration, the x-axis is light absorbance

the y-axis is light absorbance, the x-axis is SCN^- concentration

the y-axis is light absorbance, the x-axis is Fe³⁺ concentration

the y-axis is Fe³⁺ concentration, the x-axis is light absorbance

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The graph below is a calibration curve for determining the concentration of Cu²⁺ from light absorbance at a wavelength of 610 nm. This calibration curve was created in the same way as the one involving Fe²⁺ you will generate in this experiment.

If solution of copper has an absorbance of 0.901 at 610 nm, what was the concentration Cu²⁺ in the solution?

The part shown in the figure below is to be used as a rotating member in a machine. Which of the following will NOT increase the fatigue life of this part?

Reducing the fillet radius (ie, the radius at the base of the change in section) between the middle bearing and the adjoining sections

Redesign to equalize the cross-section of the middle bearing

Surface hardening treatments such as shot peening

Polishing the surface to remove scratches

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A structural component is to be made from 4340 steel in the form of a very wide plate. The steel has a yield strength of 1500 MPa and a plane strain fracture toughness of 60 MPa m^1/2. Assume plane strain conditions exist. It is not possible to detect flaw sizes less than a=3mm (resolution limit of flaw detection apparatus). Determine whether or not a critical flaw is subject to detection. Assume that the design stress level (i.e., the maximum stress to which the component will be loaded in service) is half the yield strength and that Y is 1.0.

The part shown in the figure below is to be used as a rotating member in a machine. Which of the following will NOT increase the fatigue life of this part?

Reducing the fillet radius (ie, the radius at the base of the change in section) between the middle bearing and the adjoining sections

100%

Redesign to equalize the cross-section of the middle bearing

Surface hardening treatments such as shot peening

Polishing the surface to remove scratches

View this question

The part shown in the figure below is to be used as a rotating member in a machine. Which of the following will NOT increase the fatigue life of this part?