A stock solution of potassium nitrate, KNO3 has a concentration of 0.50 M. What volume of dilute potassium nitrate (0.10 M) can be formed with 80.0 mL of the concentrated solution?

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction. express your answer as a chemical equation. identify all of the phases in your answer.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit