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science test study set vocab

what is needed to start a chemical reaction? Activation energy
you read the_______ as yields in a chemical equation or formula. what belongs in the blank? Arrow
Which way of these two means the alteration chemical properties of matter?Conservation of mass or chemical changes chemical changes
what changes energy or changes in properties of matter? chemical reactions
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
the amount of matter can or can't change? PS the term is known as Conservation of mass can
When a compound breaks down into a simpler substances it is called what? Decomposition reaction
What kind of reaction shows that a chemical reaction took place according by energy? Endothermic reaction
What kind of reaction shows that a chemical reaction took place according by releasing heat? Exothermic reaction
what alters only the physical properties of matter? Physical change
a solid that forms from a solution during a chemical reaction is called a _______________ precipitate
the materials you have after a chemical reaction is called the a. subscripts b. reactants c. products d. all of the above products
the materials before a chemical reaction are called __________ reactants
one part of a compound is displaced is what Replacement reaction
solid liquid and gases and plasmas are __________ states of matter
_________ are the number in a Chemical Equation tells us how many atoms are in that element or molecule subscripts
two substances combine to form a compound this is called_________ synthesis raction
what are changes in energy are called what characteristics of chemical reaction
a number placed in front a of a atom number is called coefficient
Created by: 1541929762764681