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36 Cards in this Set
- Front
- Back
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The evidence of a Chemical Reaction that is observable is?
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The production of NEW MATERIAL with PROPERTIES THAT ARE DIFFERENT from those of starting materials
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What are some of the changes in the properties?
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Changes in state, color, smell, texture, temperature
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A solid that forms from solution during a chemical reaction is called?
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PRECIPITATE
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The second observable characteristic of chemical reaction is a _______ in ______?
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change energy
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In which ways does chemical reaction change in regards to energy?
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Some reactions are;
ENDOTHERMIC: a reaction that absorbs energy EXOTHERMIC: a reaction that releases energy |
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Chemical reactions on a small scale occur when chemical bonds _____ or when _____ bonds _____.
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break
new, form |
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What holds atoms together in molecules?
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CHEMICAL BONDS
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What determines the properties of a substance?
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the types of atoms that present and the types of chemical bonds
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What is a shorter, easier way to show chemical reactions ?
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CHEMICAL EQUATIONS
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How do you write chemical formulas?
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Identify elements in a compound and the ration of the elements
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What do SUBSCRIPTS show?
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the numbe of ATOMS of an element in a molecule OR
the ratio of elements in a compound |
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What tells you the substances you start with and the substances you end with?
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a chemical equation
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The materials you start with at the beginning of a reaction?
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REACTANTS
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The materials you have at the end of the reaction is called what?
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PRODUCT
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During a reaction, what does the term mean "conservation of mass"
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During a reaction, matter is NOT created or destroyed
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What is a coefficient?
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the number placed in front of a chemical formula in an equation. It represents the number of molecules it precedes. or the number of atoms 2Na is two Na atoms.
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When two or more substances combine to make a more complex substance it is called?
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SYNTHESIS
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What process breaks down compounds into simpler products?
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DECOMPOSITON
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When one element REPLACES another in a compound, or when two elements in different compounds TRADE PLACES, it is called what?
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REPLACEMENT
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What is the amount of energy needed to start a chemical reaction?
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ACTIVATION ENERGY
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In exothermic reaction they DO NOT NEED ADDITIONAL energy, so they ___ ___ heat?
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give off
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In endothermic reactions they DO NEED ADDITiONAL energy to continue so they ____ heat!
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absorb
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The amount of one material in a given amount of another material is called ?
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CONCENTRATION
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What happens to the particles when you heat a substance?
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Its particles move faster and increase the reaction rate?
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Only the surface particles of a _____ can react with liquid or gas.
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solid
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You _____ the amount of the solid that comes in contact with other reactants by increasing the surface area
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INCREASE
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What is the material called that increases the rate of a reaction by LOWERING THE ACTIVATION ENERGY
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CATALYST
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What are biological catalysts that contained in the cells of living things?
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ENZYMES
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What decreases the rate of a reaction?
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INHIBITORS
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What's combustion?
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The RAPID REACTION between oxygen and a substance called a fuel! Occurs when substance has a 100 deg. Celcius flashpoint
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A material that releases energy when its burned is ?
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FUEL
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WHAT IS THE FIRE TRIANGLE?
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the three things necessary to start a fire:
Fuel Oxygen Heat |
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How do you control a fire?
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Remove one or more parts of the triangle.
Use water on it. |
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How do you fight fires?
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*baking soda with liquids to produce carbon dioxide
*Fire extinguishers |
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Know how to balance equations
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be sure to match them element to element
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Study the Illustrations
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Understand how it works
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