Introduction Atoms‚ molecules‚ compounds and mixtures‚ although they may not seem it‚ are different. Atoms make up all of the above and elements. They are made an equal amount of protons and electrons. Molecules are made when two or more atoms connect chemically. Like molecules‚ compounds are made when two or more atoms connect chemically. Unlike molecules‚ the atoms need to be two or more different elements. Mixtures are made of two or more compounds or elements. Mixtures can look completely the
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computers and television‚ and a host of essential services that we take for granted. However‚ electricity has much more important aspects because it is a fundamental feature of all matter. Electricity is the force that holds together the molecules and atoms of all
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BHARATHI MATRIC HR. SEC. SCHOOL KALLAKURICHI STD: X SUB: SCIENCE PRE QUARTALY TIME: 3.00 MARK: 100 PART-A I. Choose the correct answer 15x1=15 1. Pick out the wrong statement (a) In a dicot seed there is a short longitudinal whitish ridge is called the Raphael (b) There is a minute opening in dicot seed is known as micropyle . (c) The rudimentary stem portion known as radical. (d) The rudimentary root portion is called radical. 2. The roots of coconut tree are seen
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Chapter 2 The History of the Atom It took many scientists and philosophers hundreds even thousands of years to come up with an accurate atomic theory. For nearly 2‚000 years science was unable to come up with experiments that were able to test and put forth the theories made up by Democritus which was a fifth century B.C. Greek philosopher. In 1803‚ John Dalton‚ who viewed the atom as a small solid sphere‚ and is credited for the developing of the first coherent atomic theory was now in the picture
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Chapter 1: Measurements (20) 1) The measurement 0.000 004 3 m‚ expressed correctly using scientific notation‚ is A) 4.3 x 10-7 m. B) 4.3 x 10-6 m. C) 4.3 x 106 m. D) 0.43 x 10-5 m. E) 4.3 m. Answer: B 2) Which of the following measurements has three significant figures? A) 0.005 m B) 510 m C) 0.510 m D) 0.051 m E) 5100 m Answer: C 3) Which of the following numbers contains the
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BOHR’S MODEL OF ATOM MADE BY:-GROUP-1{CHEMISTRY} About The Scientist……. HE was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory‚ for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research. He was born in Copenhagen on 7 October 1885. He wrote many books like the theory of spectra and atomic constitution‚ atomic theory and the description of nature. NEILS BOHR
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Science Chpt 11 and 12 Study Guide Name _________________ Chpt 11 1. Democritus named the atom. The word atom means __________________________ 2. Define atom and determine if you can or cannot divide it into simpler substances. – 3. List the 3 subatomic particles of the atom are and their charges a. b. c. Be able to identify those particles on a diagram!!! 4. Be able to label a diagram of a atom using information from the Periodic Table 6 _________________________ ______________________
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Over time many theories have been developed into the structure of the atom and what the world around us is composed of. Many scientists and philosophers have dedicated their life works into trying to understand how atoms work and what they are made up of‚ although not all theories have been accepted they have all come together to form what we know today. It all started from a Greek scientist called Democritus‚ who developed the idea that everything is made up of smaller things‚ which he named atomos
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AQA GCSE Chemistry Unit 1 C 1: Fundamental ideas: C 1.1. Atoms‚ elements and compounds: * All substances are made up of atoms. * Elements contain only one atom. * Compounds contain more than one atom. * An atom has a tiny nucleus in its centre‚ surrounded by electrons. C 1.2. Atomic structure: * Atoms are made up of protons‚ neutrons and electrons. * Protons and electrons have equal and opposite electrical charges. Protons are positively charged‚ and electrons are negatively
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The essay written by Kakalios discusses the miniaturization of atoms‚ and if it is possible to shrink a human. The essay has several problems‚ such as including unneeded information throughout the essay and in the conclusion‚ and not having a clear thesis statement. These things put the structure into question. To begin with‚ the essay’s introduction lasts for several pages and does not make the main point clearly known. Instead‚ a comic book character named Dr. Pym is discussed‚ making one wonder
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