If the valency of oxygen is 2, derive the valencies of the other elements present in the following oxides. Na2O, ZnO, Al2O3, MgO,

Consider the substances below. • 1 mol of beryllium • 1 mol of salt • 1 mol of water • 1 mol of hydrogen Which statement is true about these substances? 1) They have exactly the same mass. 2) They have different numbers of particles.

What are the two main components of the nervous system A. the brain nervous system and the spinal cord nervous system B.

A mixture of two gases with a total pressure of 2.12 atm contains 0.70 atm of Gas A. What is the partial pressure of Gas B?

Im earth is about 4.5 billion years old which statement is true

g Calculate the concentration of hydronium in a solution that contains 5.5x10-5 M OH - at 25C. Indentify the solution as acidic, basic, or neutral. 1.8x10-10 M, basic 9.2x10-1 M, acidic 1.8x10-10 M, acidic 9.2x10-1 M, basic 5.5x10-10 M, neutral

The osmotic pressure is found to depend on the concentration of the solution. What way, directly or inversely

The following reaction was monitored as a function of time: AB-->A+B A plot of 1/AB versus time yields a straight line with slope 5.5 * 10^-2 (M? s) ^-1. What is the half-life when the initial concentration is 0.

The science student wants to find the mass of a wooden block. What is its appropriate name and use of the equipment

What should be done if a chemical is poured from an original container into another container not intended for immediate use?

Substances and mixtures are two types of___.