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Please provide working out on this question and explain how neutralisation works with polyprotic acids, thanks in advance

Could someone please help me with the 5-marker procedure of the investigation, I am a bit confused about what materials to use and how I should measure the volume of the solutions (measuring cylinder??) and the mass of the mixed solution

In stats, why is the median sometimes a better representation of the middle value compared to the mean ? Also, when comparing two sets of data, how does the median suggest anything about the skewness of the data set ?

Why are fumes from organic compounds harmful ?

By banking a car at an angle while travelling, we are decreasing the need for frictional force to maintain its velocity. But what does this have to do with the normal force of the car when it is on flat surface and at an angle ?

Is there a reason why the power sockets at our home is AC and not DC , aside from the fact that AC is more efficient at transferring power over long distance ? Would it be not safe to use DC at home or something ?

Any essential points that I should include to fully answer the 9 marker question ? also how do I find the concentration of a weak acid, I cant use sodium carbonate right ? since it is a weak base ?

What are some ways of increasing validity ? let's say that I am conducting a prac of projectile motion in a classroom setting and aiming to find the angle that will produce a certain distance.

If I am working on a titration, and I forget to rinse the sides of a beaker when transferring a dissolve primary standard into the volumetric flask, then would I be limiting the validity of the experiment or am i decreasing the accuracy of the experiment ? or both ?

Could someone please explain how changing the variables in the double slit set up would affect the interference patterns ? Thanks

please help for this question, also is gravimetric analysis still part of the hsc syllabus ?

Why can sound wave and longitudinal waves not be polarised ?

Why can we not use a strong acid or base for buffer solutions ? I have found answers saying that they dissociate completely but that doesnt really explain it.

Could someone please help me with this question ? Also, why is sodium hydrogen carbonate always most preferred when it comes to neutralising acid spills, why cant we use something else ?

How would I sketch the graph for 3(c), I kinda forgot what category of graph this falls into

What is the difference between inertial, non inertial and rest frames ?

How would the shorter length of Y affect its force asserted on Z ? does shorter length mean that the force exerted is smaller ? why is that ? what would happen if the length of Y is longer than Z ? please show working out. Thank you so much.

What exactly is permittivity of free space and permeability in electromagnetism ? I have been hearing these words for almost a term but still confused. o_O

please explain how to do this

Could someone explain why the answer is D, and not the other choices ? Thanks in advance