Neon gas effuses through an opening in 52 seconds, an unknown gas effuses the same distance in 76.8

Calculate the molecular mass of the unknown gas

Which definition describes a half-life

Moles of hydrogen in 9.15*10-2 mol C4H10

1. Calculate the end velocity of a rocket that traveled 16km in 2 seconds. distance time 2. Calculate the rockets acceleration m with a start velocity of 0m/s and the end velocity from #1 for 10 seconds.

Which of the following is an example of a species changing over time. Choose all answers that are correct. A. A gardener notices a new kind of squash growing after he only planted seeds from his previous squash plants. B.

I have 3.5 mol H2O. How many moles of hydrogen atoms are in the sample of water? A) 3.5 mol B) 1 mol C) 7 mol D) 13.5 mol

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?

Which of the following is easist to accelerate? A. bowling ball B. tennis ball C. golf ball D. ping pong ball

Fish need at least 4 ppm dissolved o2 for survival. part a what is this concentration in mol/l?