A volume of 229 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and the temperature is 25°C. Calculate the atomic mass of the metal.

How do astronomers learn about the internal structure and evolution of stars? How does a new star form? What causes a supernova to occur? Explain. Is the lifetime of a massive star shorter or longer than a star like the Sun? Why?

Through which medium would sound waves move most slowly? A) air B) aluminum C) Glass or D) water

When an object has a negative charge, which of these describes the electric field surrounding the object? A. It's neutral. B. It gets stronger away from the object. C. It becomes positive away from the object. D.

What do the group numbers mean on the periodic table?

a car is moving in a circular horizontal track of radius 10 m with a constant speed of 10m/s. A bob is suspended from the roof of carby a string of 1 m. The angle made by stringwith the vertical is?

Why do liquids flow? A liquid particles are wet? b liquid particles are smooth? c Liquid particles are not fixed in place? d liquid particles are attracted to each other? I think the answer is D

Identify at least two ways that runoff can negatively impact an ecosystem.

How do we know that the universe is getting bigger faster and faster?

Which is a correct description of hooke's law? a. the force applied to a spring equals the product of the spring constant and the displacement. b. the force applied to a spring equals the spring constant divided by the displacement. c.

which of the following are examples of circular motion? A. Roller skating down a hill. B. A race car going around a rounded curve in the road. C. Earth going around the sun. D. The path of a soccer ball rolling on the ground. E.