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21 Cards in this Set
- Front
- Back
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example of an ENDOTHERMIC reaction
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baking a cake
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on a distance/time graph, what represents no movement?
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a flat line
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substances listed after the arrow in a chemical reaction
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products
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substances listed before the arrow in a chemical reaction
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reactants
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solid that forms in a solution during a chemical reaction
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precipitate
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when electricity is used to break apart water molecules - what shows that a chemical reaction is taking place?
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gas bubbles are formed
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what two properties are needed to show motion of an object on a line graph?
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distance and time
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on a distance/time graph an exact diagonal line represents ________
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constant speed
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an object that travels 20 meters in 10 seconds, has an average speed of ______
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2 meters per second
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Examples of chemical change
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meat spoiling and changing color; formation of gas bubbles
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movement only occurs when________
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force in one direction is greater than the force in another (unbalanced forces)
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a balanced chemical equation demonstrates the __________
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law of conservation of mass
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the law of conservation of mass says:
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matter can be neither created nor destroyed in a normal chemical reaction
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what is required to change the direction of a moving object?
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an unbalanced net force on the object
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a balanced chemical equation has________
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the same number of atoms in the reactants as in the products
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in a chemical formula, a _______ indicates how many molecules of a compound are present
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coefficient
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in a chemical formula, a ______ indicates how many atoms of an element are present
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subscript
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physical changes during the digestive process
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change in shape of food as it is chewed
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chemical changes in the digestive process
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reactions of saliva, stomach acid, bile and pancreatic juices with food
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a change in position
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motion
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existing electron bonds breat and reattach to other atoms
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a chemical reaction
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