How many variables should a scientist change at one time to have a good experiment?

Which statement correctly describes potassium iodide, KI? There is a one-to-one ratio of potassium ions to iodide ions. Potassium gains electrons and iodine loses electrons during the reaction.

A chemist determines by measurements that. 070 moles of hydrogen gas participate in a chemical reaction. Calculate the mass of hydrogen gas that participates. Round your answer to significant digits.

Identify each definition that applies to the compound in red. Check all that apply. F - + HSO4 - = HF + SO4^2- Arrhenius acid Bronsted-Lowry acid Arrhenius base Bronsted-Lowry base

Chemicals become positively charged by

Pick appropriate solvent (s) to dissolve vegatable oil (nonpolar).

How much thermal energy (q) is required to heat 15.2 g of a metal (specific heat = 0.397 J/G) from 21.0 degrees C to 40.3 degree C

Two gas jars are connected to each other, but they are separated by a closed valve. One gas jar contains oxygen, and the other is empty. What will happen when the valve is opened?

4. Calculate the final concentration if water is added to 1.5 L of a 12 M NaOH solution to make 3.0 L of a diluted NaOH solution. Your answer

Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a strong base, either of which, if ingested separately, would be very caustic and damaging?

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids