A fireworks designer is planning a red-, white-, and blue-themed finale for her fireworks display. She is also planning a fountain
effect. Describe the chemicals she so will need and how each will produce the
desired effect.

(Please help)

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.

Apound is approximately 0.45 kilogram. a persons weighs 87 kilograms. what is the persons’s weight, in pounds, when expressed to the correct number of significant figures

The term gas is limited to those substances that exist in the gaseous state at