An impure sample of X melts at around 90°C. What is most likely to be the melting point of X?

A) Between 90°C to 95°C
B) Between 80°C to 90°C
C) Below 80°C
D) Cannot be determined

How does concentration affect reaction rate

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

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.