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Description
Flashcards by Mariapaula AR, updated more than 1 year ago
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Created by Mariapaula AR
about 10 years ago
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| Question | Answer |
| John Dalton | All atoms were like spheres. They varied in size, mass or colour. - All matter is made of small indivisible particles called atoms. - All the atoms of an element are a like in properties like size and mass. - Atoms of different elements have different properties - Atoms of different elements can combine in specific fixed ratios to form new substances. |
| Thomson | An atom was a sphere of positive charge imbedded with negative particles. The negatively charged particles were called electrons. |
| H. Nagaoka | A Japanese scientist H. Nagaoka placed the electrons outside the atom. He said they travelled around the atom in a pattern like the rings around the planet Saturn. |
| Rutherford | Discovered the nucleus of the atom. The model of the atom he suggested after that discovery resembled a mini solar system where the sun is the nucleus and the planets orbiting the sun are the electrons. |
| Bohr | Bohr suggested that the electrons surrounding the nucleus were in specific energy levels. If they didn't, then the atoms would not emit light in specific wavelengths and frequencies. |
| Quantum Mechanical Model | The quantum mechanical model of the atom is the one used today. The theory of electron movement has been abandoned. Instead, the idea is that electrons are a sort of cloud that covers entire areas all at once in different levels of energy. |
| WHMIS | Workplace Hazardous Materials Information System |
| Poisonous add Infectious Material Compressed Gas Poisonous Causing Immediate Effect Biohazardous Infectious Materials Oxidizing Materials Flammable Corrosive Material angerously Reactive Material | |
| Proton | Nucleus Positive |
| Neutron | Nucleus Neutral |
| Electron | Surrounding Nucleus Negative |
| Heating and Freezing | Heating (Temporary) usually sealed in an oxygen free atmosphere Freezing (Almost Indefinite) |
| Salting | -Method of preserving meat or fish usually -Dries the food by drawing out water which leaves bacteria inactive or dead. -This method was used by sailors. |
| Fermentation | -Biochemical preservation technique which uses lactobacilli -This bacteria preserves food while increasing the vitamin level -This was useful in the times where people suffered from Scurvy. |
| Metallergy | The science of producing and using metals |
| Copper (History) | Hammered into tools but became brittle. |
| Annealing (Definition) | Heating copper before it is hammered, to avoid brittle tools |
| Smelting | The process of separating metals from other elements by melting |
| Bronze | Sumerians smelting copper ores and tin ores to make bronze |
| Smelting Iron | Smelting Iron became common in 1200 BCE |
| ARISTOTLE'S DESCRIPTION OF MATTER | Aristotle thought that all matter was made of water, fire, air and earth. |
| Democritus | Thought that matter was made of tiny particles which he called atomos which means 'indivisible' |
| Alchemy (Definition) | Alchemy was a mix of magic and chemistry. Alchemists tried to get rich by turning ordinary elements like copper into gold. |
| Alchemy (Chemical Discoveries) | -Mercury was discovered -Procedures for making mineral acids were developed -laboratory equipment was improved |
| Job in Chemistry: Agrochemist | Bachelor in Science in Chemistry or closely related field - Work in the agricultural field - Study food of plants, livestock and humans - They also examine chemicals used to increase crop yields - Examine pesticides, herbicides and insecticides. |
| Job in Chemistry : Forensic Chemist | Bachelors in Chemistry or Forensic Science - Analyze hairs, blood, etc, from crime scenes. - Analyze non-biological - Forensic labs, toxicology lab, police departments |
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