The pressure of a sample of helium is 4.5 atm in a 300. mL container. If the container is compressed to 200. mL without changing the temperature, what is the new pressure (in atm)?

Explain which atom l or m is more stable and why

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state. a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car