3. Which of the following would be expected to react with active metals to produce gas bubbles?
A. NaOH
B. H2SO4 C. КОН D. Naci E. HC F. B&E G. A&C H. D&E

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

State one important difference between a physical change and a chemical change?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.