5. A piece of copper metal is correctly placed on a triple beam balance. The riders are all at the zero mark
except for the rider on 0-10 gram beam which is
located at the position shown.
5 6
What is the mass of the copper metal?
A) 0.455 g
B) 4. 56 g
C) 0.55 g
D) 5.50 g

What does the symbol (–hfus) indicate in a phase 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.

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures