Chemistry is a branch of science that deals with the study of matter, its properties, and how substances interact with each other. The material of which matter is composed is what we can see, hear, taste, smell, and feel around us, including the air we breathe, the water we drink, and the various devices we use every day. Chemistry may appear daunting due to the formulas, symbols and scientific jargon, but the principles are very simple when used to explain common everyday experiences. Knowing about the elements of matter enables learners to build a good foundation of knowledge that they can draw on for the study of other scientific concepts. From the beginning student of science to the individual interested in learning more about the world around him, the difference between elements, compounds, and mixtures is a good place to begin.
The understanding of the organisation and classification of substances is the base for many of the fundamental concepts taught in schools and universities in chemistry. Matter is classified according to its composition and behaviour. Elements, compounds and mixtures are three of the most important categories. The following terms are used in science when introducing early, but are the basis of many chemical processes in nature and industry. Through a gradual and systematic approach, with the help of examples readily familiar to learners, they will learn chemistry without being overwhelmed by detail. After the elementary ideas are understood, many other chemistry topics can be understood.
What Is Matter?
The key to understanding elements, compounds, and mixtures is first understanding what exactly matter is. Matter is made of things that have mass and take up space. All objects – large and small – consist of matter. Matter is any object that has a mass and occupies space.Matter is anything that has mass and takes up space like a book, a glass of water, a grain of sand, or the air in a room. Matter is the substance of which living and non-living things are made and is studied by scientists. Matter exists in various states, including solid, liquid and gas, and in all these states it is made up of very small particles called atoms.
Atoms are called the building blocks of matter. Atoms combine in countless ways to form the things that we encounter in our surroundings, but these are invisible to us. The properties of different atoms are different, and this is where the difference between gold and oxygen, or carbon, becomes apparent. Chemistry is based on the understanding of how atoms interact, combine and separate. Atoms can be used to describe the properties of matter, chemical reactions and the behavior of substances in the world around us.
Elements consists of the simplest pure substances
Element: A pure substance consisting of one kind of atom. Ordinary chemical means can’t break elements down to simpler substances. They are the simplest forms of matter and are the building blocks that make up all other matter. There are over a hundred elements known that are represented by different symbols and have different properties. These include hydrogen, oxygen, carbon, iron, gold and helium.
It helps to consider an alphabet as elements. Elements can combine to make other substances, much like letters can combine to make words. For instance, oxygen is an element that consists of oxygen atoms. In the same way pure gold consists of gold atoms. Elements are made up of a single kind of atom and so are uniform (have the same composition) throughout a sample. A very small amount of gold or some large gold bar has the same type of atoms in each.
Elements are crucial for living things and the environment. Oxygen is used in respiration, carbon is the basis of the molecules in living organisms and iron is used in many industries. Although they are simple, each one contains the basic elements needed to make more complex substances. Learners can use the knowledge of the elements to identify the structure of matter at its atomic level
Simple Diagram: Elements
He = He He He He He
Oxygen = O O O O O
Silver = Ag Ag Ag Ag Ag
A sample consists of one kind of atom, and is therefore an element.
When elements combine together, what are the products called?
Compounds are substances made up of a fixed combination of two or more different elements combined together through chemical reactions. With compounds, chemical bonding occurs to form entirely new substances that have properties different than the components. One of the most common is water. It is made up of chemically combined hydrogen and oxygen atoms. Due to the composition of these elements, hydrogen is a highly flammable gas, oxygen facilitates the process of combustion, but water does not.
One way to think about compounds is that they are like words composed of letters. Letters are unique, but when they are put together in a certain way they form words that mean something completely different. Likewise, the properties of compounds are different from those of their constituent elements. Another common example is table salt. It is composed of two elements, sodium and chlorine, which are very different from the compound they form when combined. When chemically combined, sodium and chlorine make up salt which is used in cooking and preserving food, but they are also a reactive metal and a toxic gas.
Compounds have a definite composition. There are always two hydrogen atoms to every oxygen atom in water. This fixed ratio results in predictable properties and behavior of compounds. The relationships are represented by chemical formulas. The recognition of compounds enables the learners to value the huge diversity of the natural and human world which is a result of simple elements being joined together in different combinations.
Simple Diagram: Compound Formation
Hydrogen + Oxygen
H + H + O
↓
H₂O (Water)
Atoms can combine chemically to form a new substance that has new properties.
Mixtures: Mixtures are mixtures in which no chemical bonds are formed.
A mixture is a combination of two or more substances that are mixed together but not chemically changed. Mixtures are not formed by chemical bonds between the components. Every substance has its own property and can frequently be separated physically. Mixtures are very prevalent in everyday life, occurring almost everywhere. Such as air, fruit salad, soil and saltwater.
Take the example of a fruit salad. Apples, grapes, and oranges can be placed in a bowl together but still be separated easily. Like this, each of the substances in a mixture keeps its own identity. Salt water is considered a mixture because the salt does not form a new substance when it is added to water. The salt can be separated and recovered by evaporation. Separation of components is a way to distinguish mixtures from compounds.
Mixtures are of two types: homogeneous and heterogeneous. The components of homogeneous mixtures are distributed evenly throughout the mixture. Such as air and saltwater. Heterogeneous mixtures are mixtures that have visibly different parts that are not evenly distributed. These can be a bowl of mixed vegetables, or sand mixed with gravel. By learning about mixtures, students appreciate that some mixtures do not form chemical reactions. Sometimes substances are just mixed together without losing their properties.
Simple Diagram: Mixture
Sand + Iron Filings
● ● ● ● ●
▲ ▲ ▲ ▲ ▲
Combined Together
● ▲ ● ▲ ● ▲ ● ▲
The substances are combined but not chemically combined.
Explain the difference between elements, compounds, and mixtures by using core chemistry concepts.
Elements, compounds and mixtures are all made up of matter but they are different from each other in terms of their composition and action. Elements are made from a single type of atom, and cannot be separated into simpler substances by normal chemical methods. Compounds are substances made from two or more elements in fixed ratios, forming new substances with properties different from the elements of which they are composed. Mixtures do not form new substances and some of the components of a mixture can be easily separated by physical means.
Think about the kitchen at your home. Pure oxygen is a pure substance, an element. Water for drinking is a compound because the atoms of water are chemically bonded. Lemonade is a mixture because the water, sugar, and lemon juice are mixed together but do not combine to form a new substance. The following examples illustrate the way in which chemistry classifications can be seen in everyday life. Different categories are different types of matter and their differences explain how matter can be studied in the sciences of chemistry, molecular structure, and material science.
A key reason for the differences in behaviour of substances is that they can be distinguished according to these categories. Compounds often have properties that are very different from that of the elements from which they are formed, and the properties of a mixture are often similar to those of its components. This is a significant difference in scientific research, production, medical and environmental sciences.
Explain how these concepts relate to daily life
The study of elements, compounds and mixtures is more than just a classroom or laboratory study. The concepts have implications in various fields of life including food processing, medicines, technology, and environment. An understanding of the composition of substances enables people to make decisions regarding the products, materials and chemical processes they encounter regularly. For instance, water treatment is based on separating undesirable substances from mixtures and in pharmaceuticals, the compounds are specifically designed with great care for a certain purpose.
Much of the knowledge of chemical composition is essential to many modern technologies. The compounds in the battery store and release energy, and the electronic devices include silicon and copper. Environmental scientists use mixtures to check air and water quality; agriculture uses chemical compounds to promote plant growth. Changes in substances and interactions between substances and mixtures are observed during simple household activities, such as cooking.
Students can build from the fundamentals in these ideas, which will help them build a strong base for future learning. The classification and organization of matter are fundamental to learning and understanding about chemical reactions, acids and bases, organic chemistry, and biochemistry. It helps learners build confidence with these fundamental concepts, which will help them better understand more complex scientific topics without getting lost in the confusion
Conclusion
The key concepts in chemistry are easier to grasp when they are clearly and logically explained. The basic categories of matter and how matter is organized are described in terms of elements, compounds and mixtures. Elements are the building blocks of matter, and are composed of one kind of atom. When elements combine chemically in definite proportions, the products are compounds that have properties different from those of their elements. Mixtures are made from two or more substances, which are physically combined, but can be separated physically.
The study of these core chemistry concepts will give you the basis for further study of scientific concepts. The use of the real-life examples and simple analogies allows learners to visualise chemistry as a tool for understanding, rather than a series of formulas and definitions. Knowing about elements, compounds and mixtures are a key initial step in the study of science, or just satisfying curiosity about the natural world.
