What is an element? Name three elemants.

a gaseous mixture of O2 and N2 has 22.8% of the pressure exerted by N2. What is the partial pressure of oxygen in the mixture, if the total pressure is 785.0 mmHg?

For the reaction A + B - ⇀ ↽ - C + D A+B↽--⇀C+D, assume that the standard change in free energy has a positive value. Changing the conditions of the reaction can alter the value of the change in free energy (Δ G) (ΔG).

Identify the process used to separate the components of natural gas

A sample of argon gas has a volume of 73 mL at a pressure of 1.20 atm and a temperature of 112 degrees Celsius. What is the final volume of the gas, in mL, when the pressure and temperature of the gas sample are changed to. 55 atm and 75 degrees C.

State, in terms of the arrangement of atoms, the difference in hardness between diamond and graphite.

Which of the following choices are types of energy? (Select all that apply) cube energy visible energy nuclear energy kinetic energy

Hanna hypothesizes that granite is denser than sandstone. How can Hanna test her hypothesis?

It is possible to determine the environment of sedimentation for various sand dunes by

Which change results in the formation of different substances? (1) burning of propane (2) melting of NaCl (s) (3) deposition of CO2 (g) (4) solidification of water

Suppose that a solid cube of some material floats on the surface of an oil puddle at a service station with 75.1 % of its volume submerged. The density of the oil is 923 kg/m 3. What is the density of the cube's material