Brass is an alloy, we tackle some commonly asked questions about brass, like is brass an element? in the simplest chemical term, of the elements Copper (Cu) and Zinc (Zn), mixed together in different percentages to achieve different chemical and physical properties from the mixture. Used as an alloy in a lot of industrial applications, including for uses where corrosion resistance and low friction are of primary importance.
Metallic wear and tear is less in brass, which allows it to be used in places such as locks, hinges, gears, bearings and valves. As you can see from its line of common applications, the coefficient of friction and wear and tear of brass allows it to be used in places where it has to regularly come in contact with itself.
With an alloy of such considerable importance, If not, is brass a pure substance, a compound or what is called a heterogenous mixture. We understand that the people on either side aren’t chemists, so lets ease into these questions.
What Is Brass?
Brass, as explained beforehand, is an alloy of copper and zinc. An alloy is classified as a mix of two or more metals or metallic elements. Alloys came to be because of their better chemical and physical properties than their subsisting units; for instance, copper and zinc individually aren’t as resistant to wear and tear than is their alloy, brass. So, now you know that the primary characterisation of brass is that it is an alloy. It is not an element. As for questions like is brass a pure substance or a compound, lets delve deeper into it.
Is Brass a Compound Then?
Well, lets look at it this way. A rudimentary definition of compound is that it is a union or two or more elements. By this definition, yes, brass would be considered a compound. But the scientific community does not agree with that. Because for there to exist a true compound, a bond would have to be made at the atomic level (chemical bond).
Brass does not have a chemical bond, instead it is something achieved by physically mixing the two elements of copper and zinc. What’s more, for a substance to be called a true compound, the percentage with which they form said substance has to be uniform across the board. Water is a compound because two hydrogen atoms and one oxygen atom chemically bond to form it.
One more hydrogen or oxygen atom, and you get something radically different than water. Whereas brass is primarily made from copper and zinc, but there is no fixed percentage of composition; what we mean is, if brass can made with 60-40 ratio of zinc and copper, you can vary this percentage and it would still be called and would constitute brass, making it a mixture, not a compound.
These two are the primary reasons why brass is not considered a compound.
What Actually Constitutes a Compound?
We’ve already been through this. A compound is formed whenever a chemical bond is formed between the two or more elements in it. Using this analogy, we’ve already proved that brass is not a compound, but the chemistry goody bag isn’t empty yet. There’s still one more reason using which we can discredit brass as a compound, and that is formulation percentage.
And it goes something like this. For something to be considered a true compound, a chemical compound, the chemical composition needs to be consistent every time, across the board. For example: water is H2 and O; two atoms of hydrogen and one atom of oxygen. Even a single addition would either yield H3O or H2O2, and as far as the latter goes, it’s a toxic substance.
In the case of brass, there’s no universal percentage with which both copper and zinc need to be mixed; you could take 60 per cent copper and 40 per cent zinc, and the end result would be brass. Flip the equation and you would still get brass, just with a different colour and physical properties.
These are the important constituents of a substance going as a compound.
Would Brass Be Considered An Element Then?
Nope. An element is a substance of its own. For instance, the constituents of brass, copper and zinc, are elements because in their natural state, they are just copper and zinc. A microscopic examination will only reveal copper and zinc respectively. They aren’t made from different elements; they are elements of their own. Brass is a mixture; it is COMPOSED of two elements; zinc and copper. Brass therefore cannot be considered an element.
Also Read: Chemistry for Starters: is Salt a Mixture?
How Do You Define is Brass an Element?
Elements can be considered a reflection of their namesake; elemental, as in basic. Elements are the basic building blocks of everything in the universe. Everything that you see, breathe and feel is composed of different elements, combined together. We breath oxygen, which is an element.
The universe is mostly composed of hydrogen; helium comes in at second. Both are elements. And element, therefore, is anything that is a substance of its own, is (usually) found in natural states, and lastly, is not made up of anything other than itself.
Now that we’ve discussed and shone light on some basics, we can now move on to some advanced chemistry; like discussing whether brass is a heterogenous mixture, a pure mixture or a substance of its own.
Brass: Pure Substance or Mixture?
Brass is most commonly considered a mixture, not a pure substance. Let us further expound on that.
A pure substance is something that has a fixed percentage of constituent elements. For instance, let us take an example of ammonia this time, to explain how brass is not a pure substance. For something to be called a pure substance, it needs to be if the same percentage of the constituent elements. Let us make it clear. If NH3 makes ammonia, it will always be a single atom of nitrogen, chemically bonded with three atoms of hydrogen. This will always make ammonia, because this is bonding done down to the atomic level.
Brass, on the other hand, first off, does not have chemical binding, rather it is physically mixed, which makes atomic binding impossible. Secondly, brass does not constitute a scientific and universal percentage with respect to its formation. Bearing with the previous example, just copper and zinc are needed, there is no specific percentage to follow in this case.
Which takes us to the second choice in this case. Is brass a mixture then? Yes, brass is a mixture. A mixture doesn’t have to be atomically bonded; just think of salt and water. When you dissolve salt in water, you’re not triggering a chemical reaction, you’re simply creating a mixture of two compounds. Using the same analogy, we can definitively conclude that brass is a mixture, as there is no specific percentage at which brass comes about, and neither is it chemically bonded, which makes it a simple mixture, not a pure substance.
For the PC People; Is it Heterogeneous?
No, brass is not heterogenous, it is homogenous. The difference? Heterogenous mixtures are mixtures which do not mix or dissolve properly; a classic case in example would of oil and water. As you can experiment for yourself, oil and water cannot dissolve; instead, they settle separately from each other in the same container. This phenomenon is called phases; depending on the amount of substances present, a heterogenous mix can have many phases. In the case of oil and water, it has two phases; one of oil and the second of water.
Homogenous mixtures, on the other hand, are mixtures that do not have phases and do not display segregation within the substances. To make it clear for understanding, we’ll take the example of brass again. Since there is no such segregation of elements within brass and it presents itself as a solid, uninterrupted and homogenous mixture, it is chemically a homogenous mixture, not a heterogenous mixture.
Brass As An Alloy
Brass is an alloy, this much should have been made clear throughout the passage. An alloy is defined as a mixture of two or more metals or metallic compounds; this in turn creates a new material which shares the physical properties of both the metals. For instance, alloys are mainly used in applications where metallic strength, resistance to friction, heat and wear and tear is required.
Usually what happens, the metal in question is not enough for all of these physical properties, so another one is added. In brass’ case, copper and zinc are added to make the resultant alloy more resistant to heat, wear and tear and friction. This allows brass to enjoy the physical properties of both the metals, enhanced.
Some Common Uses of Brass
Brass, as we’re sure has been made clear to you, has a lot of applications, both industrial and commercial. For starters, considering that brass is highly resistant to friction, wear and tear and heat; therefore, it is used in places and applications where the above is routinely faced by the element installed. One place of brass exclusivity are door hinges; since they have to swing around a fixed axis attached to a (usually) wooden door, they need to be highly resistant to both friction and heat generated from friction. Further examples of brass usage are listed below.
- Engineering: Commonly used in engineering, where high temperature resistance, corrosion resistance and friction resistance is required. Examples include locks, hinges, gears and bearing. All of these applications experience severe friction and generate a lot of heat as a result, which is why brass is preferred in these applications.
- Construction: Everything from radiators to piping and fittings, you can find brass in there owing to its abilities as an alloy of zinc and copper, allowing for the usage of both the elements’ physical properties.
- Plumbing: One of the major consuming sectors of brass. Everything from pipelines and small radiator pipes are made out of brass.
Jewelry: Due to its color resembling that of gold, brass is commonly used in applications of jewelry, especially those of the imitation kind or the fancy kinds. Since it is relatively inexpensive and easy to work with as compared to gold, it has a very prominent usage in the jewelry industry.
Further Clearing The Question About Brass
We realize that you will still have a lot of questions about brass, and here we’ll address some of the more commonly asked questions. Here we go.
What Type Of Mixture is Brass?
The type of mixture that brass is, is called a homogenous mixture. It is because brass’ constituent elements, zinc and copper blend perfectly together to form a smooth, untarnished brass. The elements do not separate themselves from the mixture, which is why it is the homogenous type of mixture.
How Do You Classify Brass?
Brass is classified, at a basic level, as an alloy of zinc and copper. Further classification puts it in the mixtures group, with it being further divided into homogenous mixtures group.
Why Is Brass Called Mixture?
Brass is called a mixture because unlike compounds, brass is not bonded at an atomic level (as is the case with compounds), rather it is physically mixed in large quantities to achieve the end result that is an alloy.