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So there's so much on enthalpy in the textbooks but the word 'enthalpy' isn't mentioned once in the syllabus?????????? So is this 'enthalpy' something they expect us to learn?

QUESTION: - sketch the pattern of electric field lines around a hollow negatively charged sphere (show the field inside and outside it) ??? what does this mean by 'inside' it. There is no charge 'inside' the sphere right? and if there isn't, WHY??? (am I correct in thinking that because...

So I know that validity can be ensured/improved by controlling variables and having a control. Does accuracy of equipment impact validity (e.g. smaller gradations on a thermometer)? I know that accuracy can be improved by your choice of equipment but can validity be improved if you improve your...

So I understand that a line of best fit has to have approx half points above and below What about a curve of best fit? Do you need to plot it through as many points as possible, or just plot a general shape with half of the points above and half of the points below (approx)? Thank you!

OKAY SO WHAT'S THE DIFFERENCE GUYS. I KEEP USING THE SECOND ONE (DELTAH=-mCDELTAT) because it's in the syllabus, BUT THE MINUS ALWAYS THROWS THINGS OFF. i am beyond confused!!! thanks! (sorry for caps, was getting pretty aggravated..)

Hi guys! I'm unsure as to how to answer this dot-point. 2. Explain how water's ability to absorb heat is used to measure energy changes in chemical reactions I get that water is used in calorimeters but I can't seem to elaborate any further than that. And assessing the limitations of...

yay thanks guys!! Ok so voltage is the same in two components in parallel. but then if a voltmeter has a super high resistance that means the voltage it uses is close to zero. so there is no voltage drop across the voltmeter, which somehow enables it to measure the VOLTAGE drop of the resistor...

So this is the dot-point : explain why ammeters and voltmeters are connected differently in a circuit. I'm confused as to why a voltmeter is connected in parallel. Okay so I get that this enables it to measure potential difference. And because the resistance of the voltmeter is super large...

okay so I am aware that when f"(x)=0, it can be an inflexion point, max, min, anything really..... am I right? WHY THEN, IS F'(2)=F"(2)=0 A HORIZONTAL POINT OF INFLEXION? can't it also be a turning point? I AM SO CONFUSED. thank you :) !!

Ok so I understand that glass beads allow the liquids that semi-evaporate to condense (as they don't have enough energy to completely evaporate), but what really is the point? Can't the liquids just condense on , say the glass , and evaporate when there is enough energy? Thank you!!

Re: Why is it that when cars lock together after colliding, the collision is inelasti THANK YOU both danke! But just one small thing. Why is it that they must be stationary in this case? Is it okay to infer that from the nature of the question?

Re: Why is it that when cars lock together after colliding, the collision is inelasti ALSO another question. A father and his young daughter are skiing on ice. the father is heavier than the daughter. the father pushes his daughter forward and she slides away at a speed of 3m/s. which...

THANKS (sorry if this is common sense guys )

OHHH ok THANK YOU!!!!! i just couldn't seem to understand it considering these exercises were all graphing by visual differentiation ohhhh well the answers that said it intercepted at 1 must be wrong then. that makes a lot more sense , lol

ALSO, if i was to draw the differentiated graph of an exponential , the differentiated graph too would be an exponential, but can someone please explain to me why this differentiated graph (which is an exponential) also has the y-intercept 1?

ok maybe I'm just dumb but x^2 is obviously linear if you differentiate it. but i want to draw this graph without differentiating it and only going off the gradients of x^2 and x^2 increases when x>0 and decreases when x<0 and if i drew a cubic , say x^3, wouldn't it satisfy this? a linear...

okay so why is the differentiated graph of a quadratic linear? why can't it be cubic? (now this is assuming one does not need to actually differentiate the quadratic, but only estimate the gradients relative to each other to draw a sketch of the differentiated graph. is there even a way to...

me three please! thank you :D

Guys good textbooks for chemistry, physics and biology? Thanks

OK SO HOW DO I GRAPH |x|-|y|=1 |x-y|=1 ETCTETC explanations would be greatly appreciated :) THANK YOU!!