What does stp stand for in chemistry?

Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 6.51 mL of O2 had passed through the membrane, but only 3.

Anything that melts is it a chemical change?

What is wrong with this word equation? hydrogen sulfide + sodium hydroxide → lithium hydroxide + sodium sulfide

A farmer wants to know if a new pesticide will produce better tomatoes than his old pesticide. Which of the following is the best hypothesis to use to address his question? O A.

1. Which is always true about an exoplanet? It is the same size as Earth. O It flies around another stath O It has the same temperature as Earth. It flies around our Sun.

As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element (1) decreases (2) increases (3) remains the same

What is the concentration of an acid with a pH of 2?

g Assuming that the specific heat of the solution is 4.18 J / (g⋅∘C), that its density is 1.00 g/mL, and that the calorimeter itself absorbs a negligible amount of heat, calculate ΔH in kilojoules for the reaction.

Calculate the percent ionization of 0.0075 m butanoic acid (ka = 1.5 x 10-5) in a solution containing 0.085 m sodium butanoate.

A gas has a volume of 5.0 L at a pressure of 50 KPa. What happens to the volume when the pressure is increased to 125?