Can a helium tank ever be half empty

Classify as a compound or element? (NaCl)

Which of the following statements reasonably explains why this reaction has a low activation energy? View Available Hint (s) The small NO and F2 molecules have little steric hindrance; therefore random collisions occur more frequently.

The temperature of a system rises by 45°C during a heating process. Express this rise in temperature in Kelvin. (Round the final answer to the nearest whole number.)

Kyle is using a 5.8 * 10-4 M NaOH solution in a titration experiment. What is the pH of the NaOH solution Kyle is using, to the nearest hundredth?

A molecule consists of four bonds and no lone pairs. what is its structure?

What size container do you need to hold 0.0459 mol of N2 gas at stp

What happens when two or more atoms react?

If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is produced that contains 55.06% cobalt by mass. Calculate the empirical formula of the sulfide.

Calcium's atomic number is 20. it forms ions with 18 electrons. what is the electrical charge of a calcium ion?

The doldrums region on Earth is created by an amount of heating from the Sun that results in the rising of warm, moist air, low air pressure, cloudiness, high humidity, and numerous forms of severe weather, such as thunderstorms.