Answer:
B. Flammability
I know because I am a chemistry FLVS student
I left explanations just in case you wanted to know why.
Step-by-step explanation:
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A. Boiling point- this is a physical property if you boil water, it evaporates it is still water just a different form, the molecules inside are the same just arranged differently making it a physical property.
B. Flammability- this is a chemical property. Flammability is a chemical property. It describes how easily a substance can be set on fire. This is very important when it comes to building safety.
C. Magnetism- this is a physical property. This is an intensive physical property. a physical property that is not dependent on sample size. Magnetism, density, melting and boiling points, and color are classified as intensive physical properties. Intensive properties do not depend on the size of the sample. No matter how much or how little of the substance you have, an intensive physical property stays the same.
D. Thermal conductivity- this is a physical property. The ability of a substance to conduct an electrical charge or heat is measured by conductivity. It is a physical property because the identity of the substance used is not changed i.e. no change in chemical composition. It just transmits the form of energy, such as electricity or heat.