When a physical change occurs what cannot be affected as well?
a. size
b. shape
c. density
d. composition

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?