Which subatomic particle will you add or remove from an atom to create a new element

1 protons

2 neutrons

3 electrons

What is the total number of atoms in 1.0 mole of CO2? A. 1.5 x 10^23 B. 12x 10^23 C. 3.0 x 10^23 D. 18 x 10^23

The reaction described in part a required 3.65 l of sodium chloride. what is the concentration of this sodium chloride solution?

A sample of carbon dioxide gas (CO2) contains 8.551 x 10^25 molecules. How many moles of carbon dioxide does this represent

1. Similarities between alchemy and chemistry include A. a desire to change base metals such as lead into gold. B. use of experimentation and reason. C. a desire to understand and manipulate matter. D. the foundation on supernatural beliefs.

What does it mean when a system or a reaction is endothermic?

List at least two chemical reactions that resulted in a yellow, orange, or red precipitate. For these reactions, list the possible chemical name of the precipitate.

You place air in a sealed can at stp. ypu triple its absolute temperture (K) while leaveing the volume constant. what happenes to the pressure

A current of 10.4 a is applied to 1.25 l of a solution of 0.552 m hbr converting some of the h + to h2 (g), which bubbles out of solution.

What is a greenhouse gas?

Which statement best describes a mole?