Science Experiments

A platform balance is used to weigh things. Use the links to discover more information and to see images of the device.
Platform Balance is an instrument to weigh things
platform balance- is used to weigh things.

Levers have existed since prehistoric times. There is no record of who invented levers. The earliest mention of levers of which there is a record was by Archimedes, but they were in use long before his time.

Physical changes result in a change in appearance or physical state without forming new substances, such as melting ice or breaking a glass. Chemical changes involve the rearrangement of atoms to form new substances with different chemical properties, like burning a piece of paper or rusting of iron.

The Stobbe condensation is a method used in organic chemistry to prepare α,β-unsaturated carboxylic acids from the condensation of an α-bromoester with a dialkyl malonate. This reaction proceeds through the formation of a β-keto ester intermediate, which then undergoes decarboxylation to yield the desired product.

Paper is a good insulator because it is able to trap pockets of air within its fibers, which reduces the transfer of heat. The air acts as a barrier to slow down the movement of heat energy, making paper an effective material for insulating purposes. Additionally, paper is a poor conductor of heat due to its composition, further enhancing its insulating properties.

A chemical change results in the formation of a new substance. Example: igniting hydrogen in oxygen produces water. You can use these clues to determine a chemical change has occured: a colour change, a change in temperature, light and sound,bubbles beginning to form, solid/ semi solid precipitation form, and difficult to reverse it.

A physical change is just a change of state or form eg melting ice or grinding salt. physical change can be the bending, cutting ,breaking, dissolving a substance in water (H2o)

The glass plate in Newton's ring experiment is inclined at 45 degrees to avoid interference effects caused by reflections from the two surfaces of the glass plate. At this angle, the reflections from the top and bottom surfaces of the glass plate exhibit a relative phase difference of 180 degrees, which cancels out interference effects, allowing for clear observation of the interference fringes.

Chemical properties describe how a substance interacts with other substances to form new substances, such as reactivity or flammability. Physical properties describe the characteristics of a substance that can be observed or measured without changing its chemical composition, such as color, density, or melting point.

Acids and bases are both types of substances that can be classified based on the concentration of hydrogen ions they produce. They can both conduct electricity when dissolved in water and react with each other in neutralization reactions. Additionally, they are both essential in various chemical processes and reactions.

Alcohol would evaporate the fastest among the liquids listed, followed by water. Apple juice and Coca Cola contain sugar and other compounds that can slow down evaporation. Milk, being a more complex liquid with fats and proteins, would evaporate the slowest.

Einstein helped figure out new concepts in the study of science/physics. He discovered the theory of relativity using his famous equation E=Mc2. He also discovered kinetic energy and many other things. In the early 1900s, Einstein wrote a letter to President Roosevelt warning him that the Germans were going to attack.

Mendel studied sweet peas. He studied the inheriance of certain traits in pea plants. His studies of the passing of certain traits formed the basis for our understanding of dominant and recessive genes in plants and animals.

Materials that commonly become charged with static electricity include plastics, rubber, glass, and certain fabrics like polyester and wool. These materials tend to acquire a static charge when rubbed against each other or when exposed to friction or low humidity conditions.

Shredded paper is a good insulator because it traps air pockets between the individual paper fibers, creating a barrier that slows down the transfer of heat. The air pockets reduce heat conduction, making it an effective insulating material.

A physical change involves a change in the appearance or state of matter without affecting the chemical composition, such as melting ice into water. A chemical change involves a transformation of the chemical composition of a substance, resulting in the formation of new substances with different properties, like burning wood to produce ash.

A mixture is a physical combination of two or more substances that are not chemically bonded together. A solution is a type of mixture where one substance (solute) is evenly distributed and dissolved in another substance (solvent). Solutions are a specific type of mixture.

Alum is used in vaccines as an adjuvant. Alum is commonly used as a coagulant in water treatment. And its used for domestics water.

small plastic disposable pipette, made of one piece of plastic with soft bulb and often graduated 1 - 2 ml
In general, pipettes are tools used to transport measured volumes of liquid. Transport pipettes, also known as beral pipettes, are plastic droppers that aren't calibrated for any particular measured volume.