Chemistry Questions

Which of the following is NOT a radioactive element?

CuO + H2 ---> Cu + H2O. This equation is an example of

There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?

Two or more elements combine to form a

Which of the following is used in the preparation of tincture iodine, cough syrup and many tonics?

The pH of a solution, whose hydrogen ion concentration is 1 x 10 mole per litre, will be ____.

What is the name of the process where gas is directly converted to solids called?

If the first and third members of a Dobereiner triad are Phosphorous and Antimony, the second member of this triad is