In a titration, 25.00 cm^3 of 0.100 mol/dm^3 sodium hydroxide solution is exactly neutralised by 20.00 cm^3 of a dilute solution of hydrochloric acid. Calculate the concentration of the hydrochloric acid solution.

The unit is mol/dm^3

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Particles vibrate in a rigid structure and do not move relative to their neighbors.