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.

Can someone me with 1 to 4 plz. fast

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.

Determine the empirical formula for succinic acid that is composed of 40.60% carbon, 5.18% hydrogen, and 54.22% oxygen.