A sample of nitrogen gas (N2) containing 1.5 x10^23 particles has the same number of particles as a sample containing:

A.

0.50 moles Ne

B.

2.0 moles He

C.

1.0 moles hydrogen gas

D.

25 moles oxygen gas

In what way does a catalyst increase the rate of a chemical reaction? it increases the concentration of reactants. it reacts with a portion of the reactant particles. it provides additional kinetic energy to reactant particles.

Who is the first person to observe dead cells

Which statement is accurate for these two sub-atomic particles: protons and neutrons. * A. They both have a neutral charge B. They both have a positive charge. C. They are both located in the nucleus. D. One is located in the nucleus and one is not

Calculate the amount of energy (in kJ) to convert 337 grams of liquid water from 0 degrees celsius to water vapor at 177 degrees celsius.

What is the mass in grams of 1.24 mol of water

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.

How does hess's law use intermediate reactions to calculate the enthalpy of a desired reaction?

Which atomic particle dtermines the chemical behaviour of an atom?

If you could travel to the Sun and back, about how far would you travel? A. 1 AU B. 2 AU C. 5 AU D. 10 AU

A scientist is conducting a descriptive experiment where she is monitoring sea level along coastal towns in California. What is a major benefit of this experiment? The relationship shows cause and effect. It is repeatable.