Why are alloys useful?

Chemistry

2 answers:

zalisa [80]3 years ago

7 0

Answer:

Explanation:

People make and use alloys because metals don't have exactly the right properties for a job. usually, alloys are stronger and harder than their main metals, harder to work and less ductile (harder to pull into wires).

MrMuchimi3 years ago

7 0

Answer:

The correct answer is to create new materials with very different properties.

Explanation:

An alloy is a homogeneous mixture of two or more elements, one of which is a metal. The resulting compound has very different properties from those of the elements that formed it separately. The mixture of a small quantity of one of them with another one can already modify the properties of the one that is in greater quantity. The alloy technique is used to improve the mechanical strength, hardness or corrosion resistance of pure metals.

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Write a paragraph explaining the effect of surface area on the rate of reaction.

nexus9112 [7]

(For a bit of context I will use the reaction between HCl and Mg as an example)

The larger the surface area of the magnesium metal, the more particles are exposed to collide with the aqueous HCl particles to cause the reaction to occur. This increases the frequency per second of collisions, speeding up the rate of reaction.

The effect of a catalyst is to reduce the minimum collision energy which allows the reaction to happen. This does not increase the number of collisions per second, but increases the percentage of successful collisions, which consequently causes the rate of reaction to increase .

I have drawn diagrams showing the effect of surface area, but there isn't really a meaningful diagram that I know of to show the impact of a catalyst (at least not at GCSE level).