Which of these is a diatomic molecule?

A) H2

B) Ne

C) H2o

D) CuF2

Which of the following elements is most likely to be produced during a nuclear fusion reaction in the sun? A) Helium-4 B) Hydrogen-1 C) Uranium-235 D) Uranium-238

Which statement describes the action of a buffer composed of acetic acid (CH3COOH) and sodium acetate (NaCH3COO) ? Acetic acid neutralizes added base, and sodium acetate neutralizes added acid.

Unsaturated fatty acids are often classified according to the number of carbon atoms between the terminal methyl carbon (the omega carbon) and the closest double bond to the methyl end of the chain.

Which type of matter can be separated only by physical change

Sodium peroxide (Na2O2) is used to remove carbon dioxide from (and add oxygen to) the air supply in spacecrafts. It works by reacting with CO2 in the air to produce sodium carbonate (Na2CO3) and O2.

Smoke fiilling up a room is diffusion or not

What is the independent and dependent variable for a dry ice experiment

a substance that undergoes a physical change like melting is still the same substance is it true or false

What is a polar molecule

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?