Ch 3D Test Study Guide Name: Date: Blk:
1) Please tell if each of the following are Physical (P) or Chemical (C)
a) photosynthesis ____ b) cellular respiration _____ c) chewing gum _____ d) boiling water ____
2) Please give 3 examples of physical changes: (not from above ): A)
B) C)
3) Please give 3 examples of chemical changes: (not mine! ): A)
B) C)
3) Masses of Reactants & Products are EQUAL. Law of ______
which also states ______
4) What does the subscript tell you?
5) What is a coefficient what is its purpose in a chemical equation?
6) What are 4 things that can affect the Rate of a Reaction? 1)
2) 3) 4)
7) In order to have combustion, ______MUST be present!
8) Please label each of the following equations as ENDOTHERMIC OR EXOTHERMIC
a) H2 + O2 2HO + energy ______
b) Mg2 + 2H + energy 2MgH ______
c) 7NO2 + 7H2O + energy N7H14O7 + 7O ______
d) 2CH2+ 2O22CO2 + 2H2 + energy ______
9) Please state if the following is BALANCED or UNBALANCED. If it is unbalanced, please BALANCE it.
a) NH4 + ______O2 NO2 + ______H2O ______
b) NaCl2 + ____ SO3 Na + ____O2 + _____SCL ______
10) You know you have a combustion reaction when something is ______
11) In the following equation, please identify the subscript & the coefficient
H2 + 4O2 Subscript : ______Coefficient: ______
12) Please complete the following with the correct word(s):
a) Most living things produce energy through the process of ______
b) Bubbles represent that a ______has been ______
c) A solid formed from a solution during a chemical reaction is a ______
d) An increase in temperature typically demonstrates an ______reaction because ENERGY is released!
e) A decrease in temperature typically demonstrates an ______reaction because ENERGY is absorbed!
f) A change in a substance that does not change the original substance into something else is a ______
g) Thermal energy produced by a fire is an example of an ______change
h) The 4 indicators of a chemical change are 1)
2) 3) 4)