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For the first three, do you want help balancing? Because the equation is already in the question lol. 5. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 6. 6HCl(aq) + 2Al(s) → 2Al3Cl3(aq) + 3H2(g) 7. HNO3(aq) + NaOH(aq) → NaNO3(aq) + H2O(l) 8. H2SO4(aq) + Mg(s) → MgSO4(aq) + H2(g) 9. 2HCl(aq) +...

You have to factorise out the 2 first. So it becomes √2cos2(x+pi/8), which is why it is shifted left pi/8 units. (remember that c identifies the shift when it is f(x+c), so the coefficient of x needs to be made into 1 before shifting)

Re: HSC Chemistry Marathon 2016 The unanswered one is a carboxylic acid.

:spzz:

An object is not charged unless there is an imbalance of protons/electrons. So the chair wouldn't be charged because there should be equal numbers of protons and electrons, meaning that the charge is neutral.

Oops I got beaten :P

What's the question lol (are you asking for it to be simplified?)

Welcome back :)

I have an English essay due tomorrow that I haven't finished but also have morning class at 7.00am ¯\_(ツ)_/¯

I haven't done it

:( Why can't we all just be friends....

Mhmm

We're doing SHM at the moment

The question says to find the value of t and your answer has a value for x?

ATAR calculators need you to input your marks though

Which version of Word do you have?

Click on Insert --> Equation ---> Insert new equation You should be able to select the square root symbol from 'Equation Tools' (it's under the heading 'Radical')

Can confirm

inb4 eyeseeyou comments on the uselessness of birthdays