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| area where negatively charged electrons, arranged in energy levels, travel around an atom's nucleus |
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| the different positions for an electron in an atom |
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| chemical symbol for an element, surrounded by as many dots as there are electrons in its energy level |
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| force that holds two atoms together |
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| attraction that holds oppositely charged ions close together |
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| atom that is positively or negatively charged because it has gained or lost electrons |
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| combination of chemical symbols and numbers that indicate which elements and how many atoms of each element are present |
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| How many electrons can the following energy levels: first, second, third, and fourth? |
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| WHich group is known as the Noble Gases? |
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| Whic groupis known as the Halogen Group? |
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| Which group is known as the Alkali Group? |
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| h element is the most reactive of the Halogen Group? |
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| How many known elements are there? |
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| How many of them occur naturally in nature? |
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| What are the elements that are not found in nature called because they are made by scientist in a particle accelerator? |
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| State the Law of Conservation of Mass. Who introduced it? |
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| The mass of the products must be the same as the amss of the reactants in that chemical reaction. Lavosier |
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| What are substances that release positively charged hydrogen ions, H+, in the water? |
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| When an acid mixes with water, the acid dissolves, relasing what? |
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| What does the pH scale range from? |
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| What contains the same concentration of solute as another solution? |
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| When a cell is placed in an isotonic solution, the water diffuses into and out of the cell at same what? |
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| t contains a high concentration of solute relative to another solution? |
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| Solute concentration of solution is lower than that in the cell. |
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| If two solutions of different concentration are separted by a semi-permeable memberane which is permeable to the small solvent molecules but no to the larger solute molecules, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concetrated solution. This process is called what? |
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| measure of how much solute can be dissolved in a certain amount of solvent? |
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| matter with a fixed composition whose identity can be changed by chemical processes but not by ordinary physical processes. |
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| type of mixture where two or more substances are evenly mixed on a molecular level but are not bonded together |
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| substance that dissolve the solute |
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| type of mixture where the substances are not evenly mixed |
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| ce that dissolves and seems to disappear into another usbstance |
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| in which water is the solvent |
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| the compound that is formed as a result of an ionic bond |
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| rythmic disturbance that carries energy but not matter |
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| of wave that can travel only through matter |
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| type of mechanical wave in which the wave energy causes matter in the medium to move up and down or back and forth at right angles ot the direction the wave travels |
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| type of mechanical wave in which matter in the medium moves forward and backward alont the direction the wave travels |
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| for a transverse wave one half the distance between a crest and a trough |
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| for a transverse wave the distance between the tops of two adjacent crests or the bottoms of q adjacnet roughs |
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| number of wavelengths that pass a given point in one second |
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| occurs when two or more wave combine and form a new wave when they overlap |
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| bending of waves around a barrier |
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| bending of a wave as it moves from one medium inot another medium |
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| occurs when a wave strikes an object or surface and bounces off |
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| a general term to describe all waves that can travel through empty space |
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| energy carried by electromagnetic waves |
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| the range of electromagnetic waves |
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| waves with the lowest frequency of all electromagnetic waves |
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| waves given off by almost every object |
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| waves detectable by the human eye |
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| waves that can cause sunburn |
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| waves that can penetrate skin and muscle, but can be stopped by leading shields |
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| waves with the highest frequency and the most penetrating power |
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| frequencies assigned to radio stations |
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| a system for locating items on Earth |
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| What is the number of wavelengths that pass a given point in 1 second? |
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| What are the units of frequency? |
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| Mechanical waves travel faster in what? |
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| What occurs when a wave strikes a surface and bounces off? |
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