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
Chemistry IV
vocab
| Question | Answer |
|---|---|
| the number of electrons in the outermost shell that have the highest energy level and are held most loosely in place | valence electrons |
| the number of __________ determines many properties of the element, including ways in which the atom can _________ with other atoms | electrons/bonds |
| a symbol for an element surronded by dots the represent the number of __________ __________. It is a visual representation. | valence electrons and this is the definition of a electron dot diagram |
| is a characteristic of a substance that can be observed without changing the substance into another substance | physical property |
| give 3 examples of a physical property | color, hardness, texture, shine, flexibility |
| is a characteristic of a substance that describes its ability to change into other substances | chemical property |
| give 3 examples of a chemical property | burning, tarnishing, rusting |
| is any change that alters the form or apperance of a substance but that does not make the substance into another substance | physical change |
| give 3 examples of a physical change | bending, breaking, cutting, crushing, phase change |
| is a change in matter that produces one or more new substances | chemical reaction |
| give 3 examples of a chemical reaction | burning, glow sticks, our reaction |
| a reaction in which energy is absorbed | endothermic reaction |
| give an example of an endothermic reaction | frying an egg |
| a reaction that releases energy in the form of heat | exothermic reaction |
| give an example of an exothermic reaction | fuel + oxygen changing into energy in an engine |
| a short, easy way to show a chemial reaction using symbols instead of words | chemical equations |
| the small number following a chemical symbol that tells how many atoms there are of that element. If there is no number after the symbol it is understood to be one. | subscript |
| are large numbers in front of an element that tell how many molecules there are of that compound | coefficents |
| everything that goes into a chemical equation or what is on the left of the arrow | reactants |
| everything that comes out of the reaction or is on the right side of the arrow | products |
| shows that a chemical reaction has taken place. reads "yields" or "to produce" | arrow |
| are used to separate two or more reactants or products. on the reactant side it is read as "combindes with" on product side it is read as "and" | plus signs |
| states that during a chemical reaction matter is not created or destroyed. Whatever goes in on the reactant side must come out on the product side in the same amount. They can be in a different form. | Conservation of mass |
| states that the total mass of the reactant must equal the total mass of the product. | The principle of Conservation of Mass |
| is a chemical reaction in which some of the products escape and can’t be measured | open system |
| is a chemical reaction that takes place in a contained setting where all products can be measured | closed system |
| give an example of a open system | fireplace |
| give an example of a closed system | our reaction in ziploc |
| the same number of atoms of each element must be on each side of the equation. | Golden Rule |
| the basic particle from which all elements are made | atom |
| a neutral particle made of two or more atoms joined by covalent bonds | molecule |
| a pure substance that cannot be broken down into other substances by physical or chemical means | element |
| a pure substance made of two or more elements chemically combinde | compound |
| name the 3 parts of the atom, where they are and what there charge is | proton-in nucleus-positive charge neutron-in nucleus-no charge electron- in electron cloud- negative charge |
| force of attraction between two atoms | chemical bond |
| what did Henri Becquerel discover? | the effects of radioactive decay while studying a mineral containing uranium |
| What did Marie and Pierre Curie discover? | radioactivity |
| the spontaneous emission of radiation by unstable atomic nucleus | radioactivity |
| what 2 elements did Marie Curie discover? | polonium & radium |
| consist of two protons and two neutrons with a positive charge | alpha particle |
| fast-moving electron givin off by the nucleus during radioactive decay | beta particle |
| consists of high-energy waves, similar to X-rays. Has no charge and does not change the atomic number or atomic mass | gamma radiation |
| name the uses of radioactive isotopes | tracing the steps in a chemical reaction and industrial process, and diagnosing and treating disease |
| are radioactive isotopes that can be followed through the steps of a chemical reaction or industrial process | tracers |
Created by:
amanda2992
Popular Science sets