The Earth's atmosphere is made up of approximately

__

% nitrogen.

A. 1

B. 21

C. 78

D. none of the above

A change from one state of matter to another involves the transfer of a. heat. b. atoms. c. phases. d. density.

A 39 liter SCUBA tank contains 310 grams of oxygen gas (O2, molar mass = 32.0 g/mol) at 19°C. Calculate the pressure in kiloPascals (kPa).

One symptom of carbon monoxide poisoning is the development of Mees lines on the finger - and toe - nails.

Element A has a mass of 0.444 grams and reacts with Element B via a combination reaction. The mass of the product is 0.988 grams. The molar mass of Element A is 111 g/mol and the molar mass of Element B is 68 g/mol.

If 65.1L of N2 (g) is needed to properly inflate an airbag, how many grams of NaN3 (s) are needed for the reaction

How do find the volume of 60.0g of ether if the density is. 70g/mL?

Did the test solution react with the supernatant from the test tube that had the largest amount of precipitate? what can you infer about the molar ratio of this reaction?

Contrast mixtures with pure substances

A standard cell potential of which value describes a spontaneous redox reaction?

Using the combined gas law, if the volume of a gas at 155kPa changes from 22L to 10L. What is the new pressure if the temperature remains constant?