Table of Contents
Chemical Change :
A chemical change is a process that alters the chemical composition of a substance.
A chemical change, also known as a chemical reaction, is a process in which one or more substances are altered into one or more new and different substances. In other words, a chemical change is a chemical reaction involving the rearrangement of atoms.
Physical Change
A physical change is a change in the physical properties of a substance, such as its color, phase, or density. Melting is an example of a physical change because the substance changes from a solid to a liquid. Boiling is another example of a physical change because the substance changes from a liquid to a gas.
Texture
is the surface quality of an object. Texture can be described in terms of smoothness, roughness, or any other terms that capture the feel of the surface. Texture can be used to create an illusion of depth, or to make an object more visually interesting.
Texture is an important design element because it can be used to create the illusion of depth or to make an object more visually interesting. Texture can be used to create a sense of realism, or to add visual interest to an otherwise plain surface. Texture can be created with a variety of materials, including paint, fabric, and wood.
Temperature
The temperature of a substance is the average kinetic energy of the molecules in the substance. The temperature of a substance is measured in degrees Celsius (°C), Kelvin (K), or Fahrenheit (°F).
Kelvin is the SI unit for temperature, and is measured in Kelvin units (K).
°C is the common unit of temperature measurement in everyday life. It is measured in degrees Celsius (°C).
°F is the common unit of temperature measurement in the United States. It is measured in degrees Fahrenheit (°F).
Change of state
A change of state is a physical or chemical change that alters the appearance or composition of a material.
Some common changes of state are:
melting (solid to liquid)
freezing (liquid to solid)
boiling (liquid to gas)
evaporation (liquid to gas)
condensation (gas to liquid)
sublimation (solid to gas)
Physical Properties of a Substance
The physical properties of a substance are the measurable characteristics of that substance. These include its color, odor, melting point, boiling point, density, and solubility.
Lustre
Lustre is a distributed filesystem software platform designed for large-scale data intensive environments. Lustre is scale-out software, meaning that it is designed to take advantage of large numbers of inexpensive commodity servers to manage and store data.
Lustre is open source software, released under the GNU General Public License (GPL). It is maintained and developed by the Lustre community, a global group of individuals and organizations who work together to further Lustre’s development.
Lustre is used by many of the world’s largest data centers to manage their most data-intensive workloads.
Malleability
The ability of a material to be deformed without breaking.
Ductility
The ability of a material to deform without breaking.
Elasticity
The ability of a material to return to its original shape after being deformed.
Density
The density of a material is the ratio of its mass to its volume. In other words, it is a measure of how tightly packed the atoms or molecules are in a particular substance. Density is usually expressed in kilograms per cubic meter (kg/m3) or grams per cubic centimeter (g/cm3). Some common densities are as follows:
Air: 1.2 kg/m3
Water: 1,000 kg/m3
Iron: 7,870 kg/m3
Gold: 19,300 kg/m3
The higher the density, the more tightly packed the atoms or molecules are. This usually means that the material is harder and more difficult to deform.
Viscosity
The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress. In simpler terms, it is a measure of how thick a fluid is. Viscosity is usually measured in terms of the time it takes for a given volume of fluid to flow through a given orifice.
Chemical Change
A chemical change is a change in the chemical composition of a substance. The atoms in the substance are rearranged to create a new substance.
Chemical Changes that are Common
in Foods
There are a number of chemical changes that are common in foods. One of the most common is the Maillard reaction. This reaction occurs when a sugar molecule and an amino acid molecule interact. This interaction results in the formation of a brown compound called melanoidin. The Maillard reaction is responsible for the brown color that is often seen in foods like bread, toast, and coffee.
Another common chemical reaction in foods is the caramelization reaction. This reaction occurs when a sugar molecule is heated. The sugar molecule breaks down and forms a compound called caramel. Caramel is a brown compound that is often used to add flavor and color to foods.
The oxidation of food is also common. This reaction occurs when a food is exposed to oxygen. The food molecule reacts with the oxygen and forms a new compound. This new compound is often called a radical. The oxidation of food can cause it to spoil, or go bad.
Temperature Change
Water molecules are constantly in motion, and as the temperature of a liquid changes, the speed of the molecules changes. The hotter the liquid, the faster the molecules move. When a liquid is cooled, the molecules move more slowly.
Water molecules also have a tendency to stick together. This is called cohesion. Cohesion is what makes water droplets form. The hotter the liquid, the more the molecules move and the less they stick together. This is why water droplets form more easily when the liquid is cold.
Colour Change
The colour of this product may change over time.
Odour
less
This refers to a product that does not emit any scent. An odourless product is ideal for those who are particularly sensitive to smells or for use in areas where strong smells could be a problem, such as in a hospital.
Precipitate Formation
The solubility of a sparingly soluble salt can be increased by the addition of a precipitating agent. The precipitating agent causes the sparingly soluble salt to precipitate out of solution. The precipitate can then be removed from the solution by filtration.
Bubble Formation
In order to form a bubble, a gas must be enclosed in a thin film. The gas can be supplied by an external source, such as a pump, or it can be generated by the chemical reaction itself. In either case, the gas molecules must be in close proximity to each other to form the film.
The gas molecules are held together by the attraction of the positive and negative ions. When the gas is heated, the ions move faster and the film becomes thinner. This allows the gas molecules to move closer together and form a bubble.
