I'm very confused! In the titration, the student used 25cm³ of sodium hydroxide. This volume reacted with 20cm³ of 0.1mol/dm³ of a sulphuric acid solution. Calculate the concentration in mol/dm³ of the sodium hydroxide solution.

Idon’t know how to solve this question

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?