Over the past several centuries, artists and chemists have works with one another to develop the pigments and paints that we use today. Beginning in ancient Mesopotamia craftsmen discovered that by combing soapstone, ground up copper minerals, sand, and chalk, they could create a blue material. This material eventually became a crucial part of Egyptian art and culture. At the beginning of the eighteenth century, an alchemist was working on creating a red lake pigment. A lake pigment is usually made
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Introduction: A chemical change is any change that results in the combining of chemical substances to form new ones. Chemical changes can be detected by seeing a change in the colour, smelling a gas, seeing bubbles (effervescence), seeing a new solid form in a clear solution or seeing the energy being produced or absorbed in the form of heat or light. A physical change is the opposite of this. It is a change that does not result in the forming of a new substance. Two examples of chemical changes in real
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Conclusion: This experiment aimed to find out the empirical formula of magnesium oxide. In order to determine the percentage composition and empirical formula of magnesium oxide, a 10cm piece of magnesium strip was placed inside a crucible and heated strongly with a bunsen burner, to react it with the oxygen in the air. The masses were measured before and after the reaction. Balanced equation for magnesium oxide: 2Mg + O2 2MgO (“Types of Reaction”) According to “Burning Magnesium”, after magnesium
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Science Assessment Task 3 – Script Technetium-99m An isotope of an element has the same number of protons but has a different number of neutrons. A radioisotope is an isotope that’s nuclei is unstable and therefore emits particles or rays of radiation. An example of a radioisotope is Technetium-99m. Technetium-99m emits gamma radiation. Gamma radiation is the highest frequency electromagnetic radiation that nuclei can emit, but don’t be scared just yet, because only such a small amount of radiation
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Define the following terms and use them in your answers below. - Solubility: The greatest quantity of a solute that can be dissolved into a solvent - Soluble: When a substance can be dissolved into a solvent. Ex: sugar can be easily dissolved into coffee or tea. - Insoluble: When a substance cannot be dissolved into a solvent. Ex: oil cannot be dissolved into water. - Hydrophilic: Describes a substance that can easily be mixed or dissolved into water. Ex: salt - Hydrophobic: Describes
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The atom is considered to be the basic building block of all matter. A simple theory of the atom tells us that it consists of two components: a nucleus surrounded by an electron cloud. From an electrical point of view, the nucleus is said to be positively charged and the electrons negatively charged. Whereas from a size point of view, the radius of an atom is 10-10. A simple description of the nucleus tells us that is is composed of protons and neutrons. These two particle types are collectively
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EPS is approximately 98% air captured within a 2% cellular matrix, this causes it to be very lightweight resulting in lower loads applied to the foundation. It has a densities of between 10 and 35kg/m which allows for light and safe construction work. Due to its low weight it is very easy to transport, thus saving a lot of fuel, therby lowering costs. The low weight of EPS also makes it easy to handle on site, especially considering that the lifting of materials with heavy machinery has become an
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Jacqueline Kang 2-15-2015 Bio 203 Lab Measurement of Acid Phosphatase Activity Under a Variety of Environmental Conditions Introduction: Biological enzymes are very important as they allow the human body to function and produce a wide variety of biochemical reactions that help sustain life. The main purpose of this lab is to understand the narrow optimal range and varying perimeters that allow these enzymes to optimally function. The enzyme, acid phosphatase, and the substrate p-nitrophenylphosphate
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The experiment involved a Diel-Alder reaction and is also known as a [4+2] cycloaddition because the reaction takes place between two different π Systems, one of which is associated with 4 atoms and the other one having two atoms. We synthesized 9,10-dihydroanthracene-9,10α,β 13-succinic acid anhydride from anthracene (diene) and meleic anhydride (dienophile). The use of maleic anhydride as the dienophile allows for a relatively high yield because the carbonyl substituents remove electron density
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Chemicals can entry to the body through Injection; Chemicals enter the body if the skin was penetrated or punctured by contaminated objects such as needles for health care workers or bee stings for maintenance worker. Effects can occur as the substance or chemical started to circulate in the blood and build up in the target organs. In addition to, Ingestion; Chemicals get into the stomach either by swallowing the contaminated mucus that expelled from the lungs or by eating and drinking contaminated
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