If you want to heat 100 grams of lead, how many calories of heat energy would
be required to raise the temperature of
the lead from room temperature (25 °C)
to 227 °C? (The specific heat capacity of
lead is 0.0306 cal/g • °C)

The first element on the periodic table of elements is carbon. a. true b. false

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.

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h