Question
State the law of conservation of matter. In light of this law, what would you predict the results of the two weighings in reaction 8 to be? Classify each of the following as a physical property (PP) or a chemical property (CP). a. Silver conducts an electric current. b. Hydrogen burns but does not support combustion. c. Mercury had a density of 13.6 g/mL. d. Sugar dissolves in a hot cup of tea. (Think about this one. Is the sweet taste of sugar still there?) e. Diesel fuel burns in a truck engine. What chemical test could be used to confirm that the gas produced in a chemical reaction is carbon dioxide? Be specific, please. 4. Balance the following equations: a. NaOH + (NH_4)_2PO_4 rightarrow Na_2PO_4 + H_2O + NH_3 b. C_2H_6O + O_2 rightarrow CO_2 + H_2O
Explanation / Answer
1) energy neither created nor distroyed . one form of energy can be converted into another form. total energy of unverse constant
2)
a ) PP
b) CP
c) PP
d) PP
e) CP
3)
lime water test used to conform CO2. CO2 turns lime water milky
Ca(OH)2 + CO2 ---------------------> CaCO3 + H2O
4)
3NaOH + (NH4)3PO4 ----------------------> Na3PO4 + 3H2O + 3NH3