Google trend - The Substance

The Substance - 10 things to know with detail

• Definition: The term "substance" refers to a particular type of matter that has a uniform and definite composition. In chemistry, substances are classified as elements, compounds, or mixtures based on their composition and properties.
• Elements: Elements are pure substances that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms with the same number of protons in their nucleus. Examples of elements include hydrogen, oxygen, and carbon.
• Compounds: Compounds are substances composed of two or more elements chemically bonded together in fixed proportions. The properties of compounds are different from the properties of their constituent elements. For example, water (H2O) is a compound composed of hydrogen and oxygen.
• Mixtures: Mixtures are combinations of two or more substances that are physically mixed together but not chemically bonded. Mixtures can be separated into their individual components through physical means such as filtration or distillation. Examples of mixtures include air (a mixture of gases) and saltwater (a mixture of salt and water).
• Physical Properties: Substances have physical properties that can be observed and measured without changing the substance's chemical composition. Physical properties include color, density, melting point, boiling point, and solubility.
• Chemical Properties: Substances also have chemical properties that describe how they react with other substances to form new substances. Chemical properties include flammability, reactivity, and acidity.
• States of Matter: Substances can exist in different states of matter, such as solid, liquid, or gas, depending on the temperature and pressure. For example, water can exist as ice (solid), liquid water, or steam (gas) depending on the temperature.
• Changes of State: Substances can undergo changes of state, such as melting, freezing, boiling, or condensing, when they are heated or cooled. These changes involve the substance transitioning from one state to another without changing its chemical composition.
• Purity: The purity of a substance refers to the extent to which it is free of impurities or other substances. Pure substances have a uniform composition and properties, while impure substances may contain contaminants or other substances.
• Use in Chemistry: Substances play a crucial role in chemistry as they are the basic building blocks of matter. Chemists study the properties and behavior of substances to understand chemical reactions, create new materials, and solve practical problems in various industries.