Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Science Unit B
| Question | Answer |
|---|---|
| What does WHMIS stand for? | Workplace Hazardous Materials Information System |
| More sides more _________ | Dangerous |
| Solid to liquid | melting |
| Solid to gas | Sublimation |
| Liquid to solid | freezing |
| Liquid to gas | evaporation |
| Gas to solid | deposition |
| Gas to liquid | condensation |
| physical property identification ways | Colour, melting & boiling point, malleability (Flexibility) ductility (Can it be stretched into wires) conductivity |
| Physical change identification ways | Change of states, dissolving, deformation (size/shape) |
| Chemical property are only seen when... | a chemical reaction occurs |
| Chemical change leads to... | leads to new substances |
| Matter is split into two groups which are | Pure substances and mixture |
| Pure substance is split into two groups that are... | Elements and compounds |
| Elements | Materials that can't be broken down |
| Stone age chemist | Before 8000 BC, used simple tools, used fire to cook and harden tools |
| Early chemist interested in metals | 6000 BC - 1000 BC, metals highly valued, noticed different metals had different properties |
| Early Chemists- Bronze | Metals could be melted together. Copper and tin made bronze which was hard and strong |
| Hittites | 1200 BC, how to extract iron from rocks, metal age began, more metals and other materials were combined |
| Greek Philosophers | 2500 Years Ago, through about how small you could break something down |
| Democritus | 400 BC came up with the word atomos |
| John Dalton | 1808, atoms look like unique balls of matter |
| JJ Thomson | 1897, balls with +, - charges, plum pudding model (raisin bun model) |
| Hantaro Nagaoka | 1904, electrons are in orbit, saturnian model |
| Ernest Rutherford | 1908, proved the existence of the nucleus |
| Niels Bohr | 1922, electrons orbit in levels |
| James Chadwick | 1932, discovered the neutron |
| Quantum Theory | Current, electrons exist in charged clouds around the nucleus |
| Proton charge and placement | Positive, inside the nucleus |
| Neutrons charge and placement | Neutral, inside the nucleus |
| Electrons charge and placement | Negative, orbiting the nucleus |
| Who made the first periodic table and when | Dmitri Mendeleev, 1869 |
| Metals traits | Shiny, malleable, ductile, conductive, all solid (except mercury), high melting and boiling points |
| Non Metals traits | Dull, brittle, insulators, solids and gas (One liquid, Bromine) low melting and boiling points |
| Metalloids traits | Have properties of metals and non-metals |
| Alkali Metals family properties | Group 1, elements except hydrogen, very reactive metals |
| Alkali Earth Metals family properties | Group 2, reactive metals, less reactive than alkali metals |
| Halogens family properties | group 17, very reactive non metals |
| Noble gases family properties | Group 18, very stable, non reactive |
| Exothermic | gives off heat during the reaction |
| Endothermic | Reaction that absorbs heat in order to occur |
| Law of conservation mass | Matter is neither created nor destroyed |
| Open system | Products can escape and the mass can appear different |
| Closed System | trap all the chemicals and the law is easily seen |
| What happens in a chemical reaction | Bonds between reactant atoms must break, new bonds between product atoms must form, Both of these processes take energy and time |
| What can make particles mix together faster? | Temperature, Catalyst, Concentration, surface area |
| Temperature | More energy means more motion, more collisions means more reactions |
| Catalyst | Substance that assists reactions to happen faster or to occur at lower temperatures (Does not get used up or changed in the reaction) |
| Concentration | If there is more particles of either or both reactants, there will be more collisions and more reactions |
| Surface area | as we increase surface area by reducing the size of the pieces we allow more area for reaction |
Created by:
user-2008809