Nitrogen makes up what percentage of the atmosphere

Which of the following collisions will lead to the reaction shown above AB + C ® BC + A A collides with B A collides with C B collides with C All of these will be effective collisions.

Which has more molecules, a teaspoon of water that has a mass of 1.25 grams or a teaspoon of ethanol - C 2 H 5 OH that has a mass of 0.890 grams?

If an instrument has 10 ml td + / - 0.01 ml written on it, the user should ... question 5 options: record 10 ml in the notebook after using it. record 10.0 ml in the notebook after using it. record 10.00 ml in the notebook after using it. record 5.

What is the ka reaction of hcn? the ka of hcn is 6.2 à - 10-10. what is kb value for cnâ€" at 25°c?

Sixty-five percent of the mass of bone is a compound called hydroxyapatite. sixty-five percent of the mass of bone is a compound called hydroxyapatite. a. True b. False

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum