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Introduction What Is an Element? Physical Properties of Metals Chemical Properties of Metals Compounds Physical Properties of Compounds Chemical Properties of Compounds Structure and Bonding: Why Properties Differ Comparing Elements and Compounds Why Properties Matter in Real Life
Everything around you is made of substances. The spoon you use to eat, the water you drink, and even the air you breathe. Some of these substances may be simple, while others may be complex. Yet, each of these has properties that determine how they look, behave, and react. In chemistry, the aim is to remove the guesswork. We take time to study these properties to determine the composition of each of these substances and the possible changes that can take place.
Chemistry is the bridge between "this looks shiny" and "this is a metal with high electrical conductivity". There is a significant difference between the two statements. This degree of knowledge is what allows scientists to make material selections, predict and design reactions and products.
An element is a substance that has only one type of atom. Elements can be classified using their properties. For example, the Periodic Table classifies all of the known elements based on their properties.
Properties make it easier for us to analyze and distinguish each metal. These properties allow us to distinguish metals from non-metals, and metals from metalloids.
Physical properties are the properties that can be observed for a material without changing the material itself. This also involves the safe use of materials.
Some of the common physical properties are:
Some metals have high conductivity, making them very useful for wires. Other materials have low density and can be useful for structures that require lightweight materials.
Chemical properties of metals show how a material will behave in relation to other materials and change to form other new materials. It's possible to evaluate a substance by determining its components and assessing its:
A compound is a substance formed when two or more elements chemically combine in fixed proportions. For example, hydrogen and oxygen combine to form water, which has new properties different from the individual gaseous properties.
A compound can now be defined as:
The physical properties of a compound may depend on:
The compound may additionally exhibit its unique characteristics as a result of its elemental breakdown and determined chemical properties upon interacting with acids, bases, or oxygen.
Ionic compounds are usually difficult to break apart and have high melting points. Covalent compounds can break apart and usually have lower melting points and can exist as gases, liquids, or solids.
The arrangement of the atoms determines the physical and chemical properties of the compound or the element. This is why an element or compound can exist as a solid, liquid, or gas.
Key ideas include:
Understanding why certain structures exist helps us understand why salt can dissolve in water, and sand can't. Or why some materials can only conduct electricity when dissolved in water.
The importance of knowing the properties of materials helps us in choosing the right materials in everyday life and in technology.
Properties help in the following:
In electronics, depending on the stability and conductivity, certain materials are used. In construction, depending on the strength and weather resistance, certain materials are used.