Video: Linking Qualitative Metal Properties to Applications

The table shows the properties of five different metals. a) Which metal is most suitable for use in aircraft bodies? b) Which metal is most suitable for use in mass-produced gates and railings? c) Which metal is most suitable for use in hip replacements?

05:21

Video Transcript

The table shows the properties of five different metals. (a) Which metal is most suitable for use in aircraft bodies? And the answer options are (A) metal a, (B) metal b, (C) metal c, (D) metal d, or (E) metal e.

The properties of different metals listed in the table are strength, malleability, corrosion resistance, and density. Cost is not really a property of a metal but is a factor that a company will consider when fabricating a specific metal part. The properties of metals determine how useful they are in different applications. Note that the pure form of a metal is often not used for applications. Usually metals are used in alloys. And the properties of the metals in the alloy determine the overall properties of the alloy.

The question asks which metal is most suitable for use in aircraft bodies. When making an aircraft body, a manufacturer would want to make it lightweight and relatively strong. These two factors of strength and density are arguably the two most important factors when making an aircraft body. Of the five given metals — a, b, c, d, and e — the one with the lowest density also has a moderate strength. These properties or characteristics would be useful for use in aircraft bodies. Metals a, b, c, and e have high, very high, or moderate density. They would not be suitable to make an aircraft body from because the body would not be lightweight. So the metal most suitable for use in aircraft bodies is metal d. Also, metal d is highly malleable and corrosion resistant. It can be molded into an aircraft body shape easily and would have a long lifespan.

(b) Which metal is most suitable for use in mass-produced gates and railings? And the answer options are the same as before.

When mass-producing a product, cost is often an important factor. In most cases but not always, a company will plan to produce a product at low cost but sell many units and thus make a good profit overall. When making gates and railings whose purpose is for security, strength is the most important factor, so strength and cost are arguably the most important considerations when mass-producing gates and railings. The most suitable metals from those in the table with a high strength and a low cost are metals a and b. Both could be suitable to make gates and railings.

To decide between the two, we’d need to know the relative cost of each, but we don’t have this information. b has a high strength, although not as high as a, and also has a high malleability. This means metal b will be easier to press into shape. This is particularly important if the gates and railings are made from flat panels pressed and cut into shape, making metal b cost less overall to make, compared to metal a which is less malleable. So the metal most suitable for mass-produced gates and railings is metal b.

Part (c) which metal is most suitable for use in hip replacements? And the answer options are the same as before.

What properties would an artificial hip joint need to have? Well, strength would be important to carry the weight of the body as well as corrosion resistance because the new hip joint would be constantly surrounded by bodily fluids as well as dissolved oxygen. Malleability is an undesirable property for a hip joint replacement. We would not want the weight of the body to deform or alter the shape of the hip joint replacement. So we’re looking for a metal with a high strength, a high corrosion resistance, and a low malleability. It would be really great if the cost of hip replacement were low. However, this type of replacement only occurs maybe once in the lifetime of a person. And so a high cost is not really an influencing factor here.

Metals a, b, and e all display high or very high strength. However, we can rule out metals a and b because they have a low corrosion resistance, while metal e has a very high corrosion resistance and a very high strength. Added to that, it has a low malleability. And although the cost is high, the part would have a long lifespan. So the metal most suitable for use in hip replacements is metal e.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.