Construct and balance reaction equations 5) P,010
+
Ca (PO2)2 +
. → Na Sio,
+
6) SiO2 +

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.