In today’s world‚ advancements in science and chemistry are fundamental for saving lives from diseases and saving the planet from pollution. Advances in science are transforming our world at an incredible pace. A recent advancement in science is the finding of another flu virus in Chinese chickens. Scientists found this virus before it progressed to infecting humans. Scientist can develop a way of exterminating this type of flu‚ thus saving human lives. Science saves lives everyday. In parts of
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he atom is the basic unit of chemical matter. The atom is the smallest unit that defines the chemical elements and their isotopes. Everything that is solid‚ liquid‚ or gas is made up of atoms. Everything that can be seen and touched is made up of atoms. Atoms are tiny; their size is typically measured in picometers (trillionths of a meter). A single strand of human hair is about one million carbon atoms wide.[1] Every atom is composed of a nucleus made of protons and neutrons (hydrogen-1 has no
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Etymology The name atom comes from the Greek ἄτομος (atomos‚ "indivisible") from ἀ- (a-‚ "not") and τέμνω (temnō‚ "I cut")‚[3] which means uncuttable‚ or indivisible‚ something that cannot be divided further.[4] The concept of an atom as an indivisible component of matter was first proposed by early Indian and Greek philosophers. In the 18th and 19th centuries‚ chemists provided a physical basis for this idea by showing that certain substances could not be further broken down by chemical methods
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CHAPTER 4 REVISION 1. How many moles of silver atoms are in 0.780 grams of silver? a) 0.78 moles b) 0.00723 moles c) 84.2 moles d) 0.522 moles 2. What is the molar mass of Mg(BrO4)2? a) 312 g mol-1 b) 232 g mol-1 c) 168.2 g mol-1 d) 477 g mol-1 3. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W‚ atomic number = 74)? a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4 d) FeSO4 4. A compound contains 20.2%
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The Atom The basic idea of the atom was adopted by scientists thousands of years later because it explained new discoveries in the field of chemistry. Long after chemical atoms were found to be divisible‚ and even after smaller‚ truly indivisible particles were identified. Over time theories of the atom changed. The nature of atoms in philosophy varied a lot over time and between cultures and schools. The Plum Pudding Model was proposed in 1904 before the discovery of the atomic nucleus in order
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Chemistry of Food Composition Directions: Using the chapter in the text‚ “ Chemistry of Food Composition‚” answer the following questions. These answers are to be submitted at the start of the class for a grade. Make a copy for yourself for use during class discussions. It is suggested that you type your answers on the computer to improve legibility. 1. What are the nutrients needed to sustain life? Protein‚ carbohydrates‚ lipids‚ water‚‚ minerals‚ and vitamins. 2. Which can
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Application of chemistry in computer science & engeering Computer degrees often have a general science requirement and chemistry can fulfill that requirement . A computer science student choose to take chemistry classes because they are broadly useful to an understanding of structures and scientific techniques . In chemistry classes ‚ students learn about the basic structure of everything in the universe . Some colleges offer joint degrees in computer science and chemistry because of the compatibility
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Science End Of Year Revision: Biology 1. Animal and Plant cells 2. Specialized animal and plant cells 3. The 7 life processes: 4. A group of SIMILAR CELLS is called a TISSUE. A group of DIFFERENT TISSUES forms an ORGAN. A GROUP OF ORGANS working together from an ORGAN SYSTEM‚ or even a WHOLE ORGANISM. CELLS TISSUE ORGAN ORGAN SYSTEM 5. Example of this sequence in plants. …which‚ with other tissues make up a leaf (an ORGAN)… …which‚ with other tissues
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flow freely from atom to atom and molecule to molecule. An object made of conducting material will charge to be transferred across the entire surface of the object. Metals like silver‚ gold and aluminium are good insulators as it ‘conducts’ the electron current or flow of electrons fairly easily. What is an insulator? Insulators have the opposite effect on the flow of electrons; they do not let electrons flow very easily from one atom to another. Insulators are materials whose atoms have tightly bound
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Mr. Hinds Brief Revision Booklet: How Successful was the League of Nations? 1 What were the main aims of the League of Nations when it was set up in 1920? * To maintain peace. * To discourage aggression from any nation. * To encourage countries to co-operate‚ especially in trade. * To encourage nations to disarm. * To improve living and working conditions in all parts of the world. * To encourage international co-operation. * To encourage collective security. 2 What part
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