P, Q, R and S are four organic compounds. P is an unsaturated hydrocarbon.
Q burns but otherwise is unreactive.
R contains a C–C single bond and a C=C double bond.
S undergoes addition polymerization.
Which compounds are alkenes?
A. P and R only B. P, R and S C. P, Q and S D. Q, R and S

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

What are transitions between a liquid and a solid called? identify which way they are transitioning