The proportions of substances in a mixture O are always equal for each substance in the mixture
O can vary among the substances
O never can be determined accurately
O are always the same for each substance
2 points

Non renewable resources like petroleum eventually

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved