2 A boy mixed 500g of sugar and 120g of salt in 106g of lime juice. What will be the
mass of the mixture?
a. 720 g
b. 620 g
c. 726g
d. 606g

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

Your answer is a just took the test

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.