science test study set vocab
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| what is needed to start a chemical reaction? | Activation energy
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| you read the_______ as yields in a chemical equation or formula. what belongs in the blank? | Arrow
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| Which way of these two means the alteration chemical properties of matter?Conservation of mass or chemical changes | chemical changes
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| what changes energy or changes in properties of matter? | chemical reactions
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| which one belongs in the sentence below? _____________ are a shorter and easier way to show chemical reactions by using symbols instead of words Coefficient or Chemical Equations | Chemical Equations
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| the amount of matter can or can't change? PS the term is known as Conservation of mass | can
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| When a compound breaks down into a simpler substances it is called what? | Decomposition reaction
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| What kind of reaction shows that a chemical reaction took place according by energy? | Endothermic reaction
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| What kind of reaction shows that a chemical reaction took place according by releasing heat? | Exothermic reaction
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| what alters only the physical properties of matter? | Physical change
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| a solid that forms from a solution during a chemical reaction is called a _______________ | precipitate
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| the materials you have after a chemical reaction is called the a. subscripts b. reactants c. products d. all of the above | products
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| the materials before a chemical reaction are called __________ | reactants
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| one part of a compound is displaced is what | Replacement reaction
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| solid liquid and gases and plasmas are __________ | states of matter
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| _________ are the number in a Chemical Equation tells us how many atoms are in that element or molecule | subscripts
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| two substances combine to form a compound this is called_________ | synthesis raction
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| what are changes in energy are called what | characteristics of chemical reaction
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| a number placed in front a of a atom number is called | coefficient
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