How much heat is given off when 16 g liquid methanol (CH3OH) at its freezing point changes to solid methanol? (methanol AH+ = 3.16 kJ/mol)

A. 0.79 kJ
B. 0.18 kJ
C. 1.58 kJ
D. 0.36 kJ

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.

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds