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7th science
| Question | Answer |
|---|---|
| Matter | anything that has mass and takes up space; solid liquid gas measured by volume, mass |
| solid molecules | molecules can't take shape of container, tightly packed, vibrate in place pumpkin |
| liquid molecules | molecules take shape of container, spreadout a little bit, able to flow water |
| gas molecules | molecules take place of container, spread out, able to flow very freely water vapor |
| Law of Conservation of Matter | states that matter isn't created or destroyed only changes form measure the amss of everything inculded in the chemical process before and after |
| Proof of Law of Conservation of Matter | mass of un shapened pencil 6 grams according to the Law of Conservation of Matter the pencil shavings and the sharpened pencil should be 6 grams mass of sharpened pencil, pencil shavings and broken piece of lead from pencil is 6 grams |
| Atoms | basic building blocks of matter measured by the mass protons, neutrons, electrons |
| Protons | positively charged found in the nucleus with neutrons |
| Neutrons | no charged found in the nucleus with protons |
| Electrons | negatively charged found orbiting the nucleus |
| Substances | matter that has the same composition and properties throughout measure the mass of the object before and after the experiment |
| Element | mattewr that is made up of only one kind of atom that can't be broken down into simplier parts measured by atomic mass oxygen |
| Compound | substance that contains 2 or more elements chemically bonded together to create a new substance also known as a solution measured by the numver of elements and weither the elements are chemically bonded or not water |
| Mixture | made up of 2 or more substances (elements or compounds) that come together but don't combine to make a new substances measured by the number of elements and weither the elements aren't mixed air |
| Homogeneous Mixture | contains 2 or more substances that are evenly mixed on a molecular level but still aren't bonded together measured by seeing if the substances are equal in volume, mass, number, ect. coffee |
| Heterogenus Mixture | type of mixture where the substances aren't evenly mixed measured by seeing if the substances are equal in volume, mass, number, etc. cold cereal with milk |
| Physical Property | outwardly observable characteristics of matter |
| Chemical Property | How matter changes into other (new) matter |
| Physical Changes | changes that don't change the composition of a substance |
| Chemical changes | results in the change of the compostion of a substance |
| Sub-atomic particles | atoms are made up of them |
| periodic table | a chart of the elements to help to organize and display the elements |
| Atomic number | number of protons (p+'s) in the nucleus |
| Atomic Mass (mass number) | number of protons (p+) and neutrons (n0) in the nucleus |
| Metal | shiny or metallic luster and are good conductors of heat and electrity; most soild at room temperature; found on left side of periodic table |
| Non-metal | elements that are usually dull in appearance; poor conductors of heat or electrity; found on right side of periodic table |
| Physical properties of solid | can hold it, when heated become liquid, holds it shape, has definite volume, can't pass into another solid, when cooled stays solid |
| Physical properties of liquid | can't hold it, when heated becomes a gas, doesn't hold its shape, has definite volume, substances can go throught it, when cooled becomes a solid |
| Physical properties | color, odor, shape, texture, mass, wieght, volume, density, melting and boiling point, malleablity |
| Chemical properties | flammability, reactivity, rust, tarnis, burn, etc. |
| Physical changes | change in the state of matter, change in size or shape |
| Chemcial changes | color change, temperature change, formation of a gas, formation of a perceptible it is possible to have a color, temperture change and the formation of a gas without a chemical change |
| How are the elements arranged on the periodic table? | The elements are arranged by increasing the atomic #, by metal, non-metal, and mettalloid, by property |
| atomic # | protons |
| atomic mass | protons+neutrons in nucleus |
| protons | electrons |
| chemical reactions | a process that porduces chemcial change |
| Reactants | the substance that exists before the reaction begins |
| Product | the substance that form as a result of the reaction |
| Chemical Equations | tells chemcists at a glance the reactants, products, physical states, and the proportions of each substance present |
| Photosynthesis chemical reaction | CO2+H2O(reactants) produces(energy)C6H12O6+O2+H2O (products) |
| Cellular REspiration chemcial reaction | C6H12O6+O2+H2O (reactants) produces(energy) CO2+H2O(products) |
| 3 physical changes | cutting grass, teating paper, dissolving water |
| 3 chemical changes | rottening bananas, rusting car, burning match |
| copper penny turning dark | chemical change |
| wind erosion of rocks | physical change |
| Chemical formula | tlls you what elements it is made up of and how many atoms of that elements |
| Subscript | tells the number of atoms of that element |
| Chemical equation for NaHCO3 | 1 sodium atom, 1 hydrogen atom, 1 carbon atom and 3 oxygen atoms |
| Chemcial equation for C6H12O6 | 6 carbon atoms, 12 hydrogen atom, and 6 oxygen atoms |
| Acids | substances that release positively charged hydrogen ions into water |
| Bases | substances that accept hydrogen ions |
| physical properties of acids | sour taste, reaction with some metals, reaction with bases to form a neutral pH (7), has a pH range less than 7, the lower the pH, the more a acidic the solution (pH of 1 is more acidic than a pH of 6 |
| physical properties of bases | fell slippery, taste bitter, cause burns, can damage tissues, in cleaning products, reaction with acids to form a neutral pH solution (7), a pH greater than 7, higher the pH, the more basic the solution (pH of 14 is more basic than a pH of 8) |
| Some examples for acids | hydrochloric acid-0, soft drinks-1 to 4, gastric contents-2 to 3, milk-6 to 7 |
| Some examples for bases | egg whites-7 to 9, baking soda-8, sodium hydroxide-14 |
Created by:
kmm0602
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