What is one characteristic of a sample of matter that indicates it is a pure substance?

a)it can be separated using by a physical means, such as filtering. b)the components in a pure substance do not have to be in definite ratios. c)if the composition of a sample varies, the sample is a pure substance. d)if the composition of a sample is fixed, the sample is a pure substance

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?