Answer:
Add, reduce
Explanation:
Concentration is essentially a ratio of the amount of solute to the amount of solvent.
\text{Concentration} = \dfrac{\text{amount of solute}}{\text{amount of solvent}}
If you want to make a solution more dilute (less concentrated), you must do one of two things:
- Increase the denominator — add solvent
- Reduce the denominator — reduce the amount of solute
A is wrong. If you add both more solute and more solvent, the concentration will stay about the same.
B is wrong. If you add more solute and reduce the amount of solvent, the concentration will increase.
D is wrong. If you add more solute and do nothing to the amount of solvent, the concentration will increase.
Plasma because it is a charged gas and the molecules are more free to move in a gas state.
Fe is the element Iron, the 2+ is how many electrons is lost to make the ion, so 2 electrons are lost from the valence shell (to make a full outermost shell)
Answer:
there are 18 electrons in the outermost shell of argon atom
Answer:
A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. A compound is not a pure substance because it is not an element, and only elements are pure substances.