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### 20 Cards in this Set

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 Define Exothermic Reactions A reaction that releases (liberates) heat energy and makes its environment warmer. Example-burning a log. Define Endothermic Reactions A reaction that absorbs heat energy and makes its environment cooler. Example an ice cube melting. Where are the most reactive elements located on the periodic table? What is their group name? Properties? Group 1- Alkali Earth Metals, Shiny, Soft, Extremely reactive because they only need to lose one Valence Electron to become "stable" with a full outer energy level. Where are the least reactive elements located on the periodic table? What is their group name? Properties? Group 18-Noble Gasses, Colorless, Odorless;Non-reactive they have full outer (Valence) levels. Define Valence Level The outermost energy level that an atom has How do you represent the velocity of a moving object? Velocity= Speed + Direction Example: 65 miles per hour south Define Magnitude Size What is the independent variable? The variable you are testing. Ex: Which nose cone mass makes the rocket go farther. What is the dependent variable? The thing that changes in response to the thing you are testing. Ex: How far the rocket flies What is a control variable? The things you don't change from experiment to experiment to make sure that you are only testing one thing. Ex. When testing rocket nose cone mass you don't change rocket length. On which axis of a graph does the independent variable belong? The X axis On which axis of a graph does the dependent variable belong? The Y axis How would you represent a constant speed on a Distance (Position) vs. Time graph? A line with a constant angle How would you represent an object that's not moving on a Distance (Position) vs. Time graph? A straight line at a given distance How would you represent a constant speed on a Velocity vs. Time graph? A straight line at a given velocity. What does a Distance vs. Time graph show? Speed What does a Velocity vs. Time graph show? Acceleration What is acceleration? A change in either speed or direction How would you represent a object that is not moving on a Velocity vs. Time graph? A straight line at the 0 In order for an experiment to be valid, how many things can it test at 1 time? For an experiment to be valid it can only test 1 thing at a time!