Which of these is an example of a physical change?
a)sugar dissolving in warm water
b)iron rusting in the presence of moist air
c)wood burning in the presence of oxygen
d)baking soda reacting with acid to form a gas

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

How to convert a density of 0.791g/cm3 to lb/ft3

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?