Q2) why do all elements have the same positive charge as other atoms of that element?
I put because atoms of the same element all have the same amount of protons, so therefore the same positive charge as each other because protons are positively charged. Anyone else put that?? Not sure if it’s enough to get the 3 marks
the number of protons cancel out the number of electrons leaving the neutral neutrons
the practical question was easy was about density you menna say put the object on the balance and weigh it then put it in a eureka can filled with water and place a measuring cylinder next to it the volume of the object is in the measuring cylinder plug the mass and volume into density equation and find out the density
how many marks do u think is that out of 6
did you have to talk about the resolution of the measuring cylinder and control variables to kept the test fair
it can't be it has to be between 1986 and 2016 for the half life it was 137÷2 loads of time until u get 1/32 then you would count the number of times u divided it
The charge question was 60C, the question gave you the power and resistance for one of the lamps, you had to work out the current (which was 0.5A) and then multiply by 2 because there were 2 lamps, then you had to multiply it by the time (60s) which gave you the final answer of 60C.
30 for charge but I realised at the end it was 60 as it is in parallel so total current = I(1) +I(2) The last six marker was LDR and as light intensity increased the current increased and the voltage decreased
FINALY someone that used that formula. I got worried that I was the only one
What other formula are you going to use, you can't use any others, you can't use P=VI, the only other one is P=V²/R but that would be a very long method because you would have to use more than one formula to calculate the current.
30 for charge but I realised at the end it was 60 as it is in parallel so total current = I(1) +I(2) The last six marker was LDR and as light intensity increased the current increased and the voltage decreased
I got 30 for charge, you had to use the two equations “power = current^2 x resistance” and “charge = current x time” and rearrange them or whatever. Could someone explain the uncertainty question please? Just guessed it
you find the range of the values which was 80 and then divide by 2 which gave u 40 for the uncertainty