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7th science

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