Based on this activity, which cup would you purchase? You may want to consider cost and properties. Research the cost of cups on the Internet, if needed. Explain the reason for your decision.

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.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world