Most animal fats are saturated, containing more hydrogen than carbon, and do not spoil as easily as unsaturated fats. A: melt B: get used up C: go bad D: liquify

In the process described by the woman, why is the coal burned A: To produce a gas containing carbon and hydrogen. B: To remove impurities from methanol. C: To heat the reactors. D: To prevent dangerous gases from formin

Carbon chains can rotate around a double bond (carbon=carbon or C=C).

What caused the deposits A: The hydrochloric acid broke the carbon bonds in tile carbon dioxide, B: The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide. C: The burning magnesium broke the carbon oxygen bonds in the carbon dioxide. D: The gas collection method broke the carbon-oxygen bonds in the carbon dioxid

Bacteria that contain ”empty” plasmid, (plasmid without the eukaryotic gene) would grow? in all four types of broth.|only in the broth containing both antibiotics.|in the broth containing tetracycline, but not in the broth containing ampicillin.|in the nutrient broth plus ampicillin, but not in the broth containing tetracycline.

Carbon-containing compounds commonly exist as ___________________, molecules with the same chemical bonds and same chemical formula but different configuration, the fixed spatial arrangement of atoms.

______ of agricultural practices is a recognized method of carbon sequestration as soil can act as an effective carbon sink offsetting as much as 20% of 2010 carbon dioxide emissions annually.

The synonym of CO2 is .（ ）。 A: hydrogen B: carbon monoxide C: carbon dioxide D: oxygen

Carbon dioxide consists of carbon and （ ） A: oxygen B: emergency C: upgrade D: religious

are very soft ,and can be used for bolts and for machine parts that do not need strength.: Alloy steels|High carbon steels|Low carbon steels|Medium carbon steels