PHYSICAL SCIENCE physical change-changes affecting the form of a chemical substance‚Physical changes are used to separate mixtures into their component compounds Example:breaking glass Chemical changes- when a substance combines with another to form a new substance ‚called chemical synthesis. Example: burning wood Law of Conservation of Mass-The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations
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Alloy - An alloy is a substance made by melting two or more elements together‚ at least one of them a metal. An Example: Examples of alloys include brass‚ bronze‚ 14k gold‚ and sterling silver. covalent bond - A covalent bond is a chemical link between two atoms in which electrons are shared between them. An Example: There is covalent between the oxygen and each hydrogen in (H 2 O). Each of the bonds contains two electrons - one from a hydrogen atom and one from the oxygen atom. Both atoms
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this experiment is to differentiate between a physical change and a chemical change. A physical change includes a change in the material without affecting its composition‚ such as the physical state change. However‚ a chemical change includes the change in the composition of the substance. The change in color‚ formation of a gas or a solid product‚ and the production of energy are the evidences of a chemical reaction‚ thus‚ of a chemical change. Materials Crucible tongs Evaporating dish
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2013 Palmitos‚ Isabel Experiment # 2 chemical changes I. INTRODUCTION Chemical changes occur when a substance combines with another to form a new substance whether by combination reaction‚ combustion reaction‚ decomposition reaction and etc. These changes can be observed by evolutions of gas‚ appearance or disappearance of a precipitate‚ evolution or absorption of heat or even change in color. This experiment aims to observe the different chemical changes copper undergoes in different conditions
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If you could change any event in history‚ what would you change and why? Last summer vacation‚ I watched two movies directed by ClintEastwood (Clinton Eastwood Jr.).Their titles ware “Flags of Our Fathers”‚ and “Letters from IWO Jima”. These two movies ware said to have been taken faithful to reality. These movies were released in 2006‚ and these ware famous at that time because they were simultaneously produced at USA and Japan. If I could change any event in history‚ I want to change “The
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Photocatalytic degradation of methylene blue using TiO2 nanoparticles Nupur Mittal Chemical Engineering‚ IIT (BHU) Varanasi. Abstract: The aim of this research is to reduce the pollution caused by methylene blue dye in waste water coming from textile industries. For this purpose‚ TiO2 nanoparticles are made as they show good photocatalytic activity in degradation of dyes into harmless products. Synthesis is done using titanium butoxide and 2-propanol. The particles formed were a little larger
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consistently gravitated towards the villainous characters in movies. There was always an intriguing aspect of their mysteriousness that normally came with a lack of background information. They could do anything and everything they pleased without taking orders from anyone‚ not even their Mom. This is perhaps one of the most appealing aspects as to why I would decide to be a villain as opposed to a hero. I am sure that you could psychologically trace this decision back to the authoritative style parenting
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policy in place. Virginia had become a victim of a hostile work environment supported by a supervisor with immediate authority over the employee. Pollard was working in a very stressful environment in which she (being the only female) was a minority being subjected to inappropriate language and other unwanted and uninvited behavior. Pollard was humiliated on a daily basis (i.e. pranks involving taping her drawers shut‚ locking her out of the guard shack‚ having a forklift backing up to the guard
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in diet coke is a chemical change‚ but it is actually a physical change. This is because the pieces that caused the reaction are still there‚ but they have just been rearranged. This also means that changing some of the factors in this experiment might cause another physical reaction to occur on a smaller or even larger scale.(Science Buddies) What you see when mentos are put into diet coke is that the coke spews out of it’s container once contacted with the mentos. But have you ever wondered why
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