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14 Cards in this Set

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a reaction that gives off thermal energy (heat)
EXOTHERMIC REACTION
a substance (on the left-hand side of an equation) that undergoes a chemical chang
REACTANT
What coefficients must be placed in the blanks to balance this chemical reaction?

C6H12O6 ® ____C2H6O + ____CO2



A. 1, 2
B. 2,2
C. 1,3
B. 2,2
any substance that cannot be broken up into simpler substances by chemical means (Currently 115 elements have been observed and are displayed on the Periodic Table of Elements. Gold, silver, iodine, oxygen and nickel are examples of elements.)
ELEMENT
a substance composed of two or more elements, such as water (H2O), carbon dioxide (CO2), or table sugar (C12H22O11)
COMPOUND
a chemical reaction in which less energy is required to break original bonds than is released when new bonds form. In an exothermic reaction some form of energy is given off by the reaction
EXOTHERMIC REACTION
Which of the following is a physical change?

A. a battery charging
B. alcohol evaporating
C. digesting food
D. an explosion
B. alcohol evaporating
the study of matter and substances and how they change and mix to form other substances
CHEMISTRY
matter is neither created nor destroyed during a chemical change.
LAW OF CONSERVATION OF MASS
a change in size, shape, color or state of matter.
PHYSICAL CHANGE
Change that does not effect the compositions of a substance.
PHYSICAL CHANGE
the number of atoms of an element must be the same on both sides of an equation
CONSERVATION OF MASS
An endothermic reaction is a reaction that absorbs heat.
ENDOTHERMIC REACTION
a small whole number that appears in front of a formula in a chemical equation
COEFFICIENT