A voltmeter reading is recorded as 100.0 V +/- 2%. Whnt*4;q) fzq63d.nxb8w0 5cn tyf 0;cdv lkpjoich of the following could be the6ny bo8lqn ctjc;nfpd0 xfz;5 q0tw*3.k4)d v actual value?

I.98.0V
II.97.2V
III.101.3V

  A student recorded the volume of a gas 2nplj ds,- m z)nj 1s6rr2ep6aas 0.04056m$^3$. How many significant figures does the recorded value have?

  Which of the below features must b +kpym l:cfc31e included in a sketched graph?

I.Labelled axes
II.Scaled axes
III.Plotted points

  For the graph below, state the appropriate units for the y-intercep b dho/1fjuo5(t.

  Which statement best describes the relationship between x aii/8* 8etf iiynd y on the graph below? y8ie /*fi it8i

For a first order reaction, the relationship between ratw ,kq;uw xn: 4k3y4okye and the concentration of a reactant, [A], can be shown usin:4o ku3x,y4kk;nww q yg the following equation: rate =k[A].
The data below gives the rate information for the first order reaction that proceeds in the thermal decomposition of reactant A.



1.On the axes above, draw a graph based on the provided data.
2.The effect of time on the concentration of reactant B for a zero-order reaction was plotted on the graph below.

(i)Draw a line of best fit on the graph above.
2.Describe the relationship between time and concentration.

  Which of the below gives the correct units d knrngti d;b(/8.1a rfor the gradient of this line?

  A student is measuring:v-//n2ho g ki+gvmlfyt8j 5j the temperature change of an endothermic reaction.
Calculate the temperature change and identify the corresponding error.



Temperature decrease:  $^{\circ}C$$\pm$  $^{\circ}C$

  The relationship between pressure and temperature 4+chn e+ovx(i of a known volume and amount of gas can be described using Gay-Luo+c (xn+4vih essac’s law which states that pressure is directly proportional to temperature.P∝T
Where P is pressure in Pa, and T is temperature in K.




1.On the axes above, sketch the graph of P∝T.

2.State two features that would need to be added to your sketched graph to turn it into a drawn graph.

3.The proportionality can be shown in an equation by incorporating a constant, k. The equation becomes P=kT, and follows the format of the equation of a straight line.

3.1.State the feature of a straight line that k represents in this context.
The feature is   .
3.2.Deduce the y-intercept of the straight line.
it is   (Pa).

  What is the value for the gradient of th6tqr t+z7dy 3vx,s k,fv)cxo7e graph below with the correct units?

  A given mass of magnesium was added to 500cm$^3$ of aqueous hydrochloric acid in a Styrofoam cup to form magnesium chloride. The temperature at the start was 18$^{\circ}C$ and and after the magnesium had dissolved, the temperature rose to 20$^{\circ}C$.
1.State a balanced chemical equation for this reaction.
2.Given that the change in enthalpy,ΔH is 0.185kJ and the specific heat capacity of water is 4.18J g$^{-1}$K$^{-1}$,calculate the mass of magnesium added to the hydrochloric acid.
m=  g
3.Determine the systematic errors caused by the use of styrofoam cups.

Solid sodium carbonate reacts with excess nitric acid of 0.1 mol dm$^{-1}$ as shown in the equation below:
$Na_2CO_3$(s)+2$HNO_3$(aq) → $H_2O$(l) +$CO_2$(g)+2$NaNO_3$(aq)
1.State a method to measure the rate of reaction other than measuring the volume of gas collected.
2.1.Sketch a graph to show the volume of gas produced over time.
2.2.Explain the shape of your graph using the collision theory.


3.On the same graph as in part(bi), sketch another line to show the volume of gas collected over time at a concentration of 0.05 molcdm$^{-3}$ of nitric acid and label it as X.


4.Suggest and describe a factor other than the concentration that can affect the rate of the above reaction.

  Which statement best describes th13h u229xl: eb-(p qxrnsfxeo*q:qwle relationship between the rate and H$^+$ oncentration, in a graph with the equation: rate =k[H$^+$]$^2$?

  In a first order reaction, the concentration [A] of 5uit6c qx/ba(a given reactant can be determined at time t, accordiiq5/xt 6c b(aung to the equation below, where [A]$_o$ is the initial concentration of A and k is the rate constant.
ln[A]=-kt+ln[A]$_o$

  The enthalpy of neutralization for the reaction between sulfuric acid and potas rokg)q:qrce ;)3 k8d3quqxj:sium hydroxide can be determined experimentally. xo)q) e :qr;3:g3kkjcrd8 qqu
$H_2SO_4$(aq)+2KOH(aq)→$K_2SO_4$(aq)+2$H_2O$(l)
A student recorded the temperature of 20.0cm$^3$ of 0.500 mold m$^{-3}$
sulfuric acid every minute. At four minutes,25.0cm$^3$KOH(aq) is added to the solution, stirred immediately, and temperature recorded for another four minutes. The results are represented in the graph below.

1.Calculate the lowest concentration of aqueous KOH that must be used to ensure it is in excess.
C$_{KOH}$=  mold m$^{-3}$
2.Use the graph above to estimate a value for the maximum temperature change,ΔT.
ΔT=  $^{\circ}$
3.State one assumption you made in part (b).
4.Identify the anomalous result and suggest a possible type and source of error.
5.In another experiment with the same reactants, the student measured the initial and final temperatures and presented their results below:
Initial Temperature ($^{\circ}$C $\pm$$^{\circ}$C) 24.8 25.1 24.9
Final Temperature($^{\circ}$C $\pm$$^{\circ}$C) 26.4 26.6 26.4
1.Calculate the average change in temperature (ΔT)giving its percentage uncertainty.
Average=  $^{\circ}$C; Absolute uncertainty=$\pm$  $^{\circ}$C; Percentage uncertainty=  %
2.Use sections 1 and 2 of the data booklet to calculate the energy released and its uncertainty. You may assume that the only source of uncertainty is from the temperature change.
Energy released (q)=  J;Uncertainty=$\pm$  J

  Determine the type of variable and correct axis for ΔH in a graph to :/fsozkh nw;.av i2udnq 52k6show how ΔH is affected by the len . how;fa/:vuisk62dn5z 2qkn gth of the carbon chain.

  The initial mass of a morta1 uclcz v;wo4 u4i e;alf1+0t5 dbk byaf6nr04r containing a solid was recorded to be 109.34 g. The mortar was heat0n l f5yf4bcl4a r+obk6uicuvw11a4z;t; e0ded, and the final mass was recorded to be 81.92 g. What value should be recorded for the mass lost in grams?

  The half-life of a s :b a,9b k r1*c h0mtyt)/hn52bpgoeljecond order reaction can be expressed according to the equation beloe2t * 0,bg:lh bkombrt )hnp5 ay1cj/9w.
t$^{$\frac{1}{2}$}$=$\frac{1}{k[A]_0}$
Where t$^{\frac{1}{2}}$ =half-life,[$[A]_0$]= initial concentration of reactant A,and k is a constant.
Which two variables plotted against each other would produce a straight line?
I.t$^{\frac{1}{2}}$ VS $\frac{1}{k}$
II.t$^{\frac{1}{2}}$ VS $[A]_0$
III.t$^{$\frac{1}{2}$}$ VS $\frac{1}{[A]_0}$

  A piece of sodium metal has a mass of 13.02 g and a vol/b c hjft ko 5le-if)v +1(/jp3/pcfcyume of 13.4 cm$^3$. What is the most precise density that can be reported?

1.State the complete balanced equation for the reaction between sulphuric )wyvi( z5i9 e+pjr4o racid and copper (z(+) ojery4vrwi 95 ipII) oxide.
2.State the complete balanced equation for the reaction between ethanoic acid and potassium carbonate.
3.Outline two ways to monitor the rate of reaction for reaction (b) above.

  The relationship between energy, E, andv egt*fl/ (2cn wavelength, λ, is shown according to the equat(*fveltgn /2cion below.
E=$\frac{hc}{λ}$

Which of the below statements are correct for the graph below representing E=$\frac{hc}{λ}$?
I.Energy and wavelength are directly proportional
II.The units for the gradient are J m$^{-1}$
III.The y-intercept has the units J

  The feasibility of a reaction proceeycfms(xitmown3 -:s : )9ra;bding spontaneously can be predicted using the fo tassw-:n)f:mbcr xi; 3y(m9ollowing equation:
ΔG=−TΔS+ΔH.
Where ΔG is the change in Gibb’s free energy, ΔS is the change in entropy, and ΔH is the change in enthalpy.




1.When ΔG<0, a reaction can be described as spontaneous. Use the graph above to deduce the lowest temperature at Read graph at which the reaction becomes spontaneous.
Read graph at ΔG=0,  K.
2.Calculate the gradient of the line and state its units.
3.Use your answer to part (b) to deduce the value and correct units for ΔS.
ΔS=  kJ mol$^{-1}$K$^{-1}$
4.Use the graph to determine the value for ΔG when the temperature is raised to 675K.
5.Calculate a value for y-intercept and state the correct units.
Substitution of (x,y) values and slope into equation with correct evaluation=  .(c=)

  The potential of a cell under non-u;p* cyyi l1em bq1q50standard conditions can be calculated using the Nernst equationu qyi0m5ce *b1yl1pq; :
E=E$^θ$=$\frac{RT}{nF}$ln$_Q$
For the graph below, which components of the equation represent the gradient and the y-intercept?

  The relationship between the concentration of a reactant, Ak3n9r rugin3n (vb,3f6*b ntx, and the time, for a second-order reaction can be enn 3*tnfvuxrrb3 6(ni39kb g,xpressed using the equation below:
$\frac{1}{[A]}$=kt+$\frac{1}{[A]_o}$
Where [A] is the concentration of reactant A,$[A]_o$,is the initial concentration of reactant A,t is the time in seconds, and k is a constant.

1.Calculate the gradient of the line and state the correct units.
2.Use the graph to determine $[A]_o$ (also known as the initial concentration of A)
$[A]_o$=  mol dm$^{-3}$
3.Determine the time at which the concentration of A is equal to an eighth of its initial concentration.
(If you were unable to complete parts (a), and (b), you may use k=0.02, and $A_o$=42)
[A]=  mold m$^{-3}$;Substitute and rearrange:  seconds

  Which of the below gq, p;w :u s:en+kvpwutsa) w(3ives the correct average titre with its uncertainty?
Initial volume $\pm $0.05 c m$^{3}$ 0.00 23.15 0.00
Final volume $\pm $0.05 c m$^{3}$ 23.15 46.25 23.20

  The length of a thread was being measured using a 50 cm wooden rujky.09rq9z wf3 hpbn 6y:7umnler with a 1 mm increment. The reading for the beginning of the thread was 12.6 cm while the reading for the end of the thread was 45.3 cm. Which of the following is the largest .pjmy 79n uk9zfbw6n0y 3: qrhpossible length of the thread?

  The ideal gas equation allows pressure tv1jk 4doz)de8dy)82im imn nfc( kp:3o be calculated according to the equation 82idy)z4ncpd 8ifn)md3vk :k(1 o jme,
P=$\frac{nRT}{V}$.
This allows a straight line to be drawn for the effect of $\frac{1}{V}$ on P.

For the sketched graph above, which components of the equation P=$\frac{nRT}{V}$,relate to the gradient and
y-intercept of the straight line?

  A student recorded the mass of solid NaCl as 1200 g. Which of the following ydegd -ghacz) ;icd*q,659r r is correct about the number of significant figureszd5gcyacr-rh*9 de d6g); q i, recorded?

  2.00 ± 0.02 g $NaClO_3$ were dissolved in 2.0 ± 0.5 dm$^3$ distilled water.

Which row gives the correct concentration in gd m$^{-3}$ and relative uncertainty?

  A student is measuring the density of a solution. He recorded the datayr s6(wh+i1fn,fjq0 a* p/ mzg in the following ta,rwqj6zsaig1*m+fyp(fnh 0/ble.

1.Write the expression of the average density of the solution in a fraction form (make sure to include the absolute uncertainties for each physical quantity).
2.Calculate its corresponding uncertainty. Show your work clearly.
   $\pm$    %