21% of oxygen in air with barometric pressure of 625. what's partial pressure

In an experiment, a student estimates the acceleration due to gravity is 9.31 m/s2. The actual value is 9.8 m/s2. What is the student's percent error

What is the concentration of a solution prepared by adding 50.0 mL of a 3.0 M HCl solution to a 250 mL volumetric flask and filling to the mark with water?

How a metallic bond forms

What United States agency regulates what dyes can be used in foods, drugs, and cosmetics?

Two liquids of different temperatures are separated by a barrier. The hot liquid is on the right side and the cold one is on the left side. Which statement describes how the molecules move in heat flow? A.

How many minutes will be required to deposit 1.00 g of chromium metal from an aqueous?

Does a gas discharge tube filled with boron emit the same wavelength

What is HNO3 it's formula

Which indicator would be the best to use for a titration between 0.10 m hcooh with 0.10 m naoh? you will probably need to consult the appropriate table in the book. 1. methyl red, color change at ph 3-5 2.

How are elements group into families