A voltmeter reading is recorded as 100.0 V ta5l p) 3iheuerx)+ o7+/- 2%. Which of the following could be the ac +i5 lr 7aue3t)h)xpoetual value?

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

  A student recorded the volume of a gas as77 h c dbmc+vm8wq5:mt 0.04056m$^3$. How many significant figures does the recorded value have?

  Which of the below features must be include :cvxn:c3yklv;4 djl .d in a sketched graph?

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

  For the graph below, state the appropr0 7cov54n(jc bhuf4iy +rv1ge iate units for the y-intercept.

  Which statement best describes the relationshoi9 +o+r vijgn()i)rzip between x and y on the graph belogoi9 )nzovi+(+r)i jrw?

For a first order reaction, the relationship bet-mzlrd. 5eywwa8,y pu x0zl .3ween rate and the concentration of a reactant, [A], can be shown using the following equation: ratea -p 3zydz0y,8xm5wur.lw.le =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 correcqn j72hq5fpi he*kx8 v2qr2g. t units for the gradient of this line?

  A student is measuring the tempe5li*jhi6gkk4 rature 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 of a known voluh-6clw 93adune2ke . mme and amount of gas can be described using Gay-Lussac’s law which states that pressure is directly proportional to temperature.P∝Te92 e6mn3dual. wh ck-
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 6z,fh.zvc*.2 m.bf2jva lny: bjulo5the 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 the rela60( bwjez;44. gfyel0vrpjc c tionship between the rate and H$^+$ oncentration, in a graph with the equation: rate =k[H$^+$]$^2$?

  In a first order reaction, the concentration [A] 4l- muq(xj4eb of a given reactant can be determined at time t, according to the equation below, whequlm4( x-e4jb re [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 sulfua .a w4cdnm08zric acid and potassium hydroxidewdm na.8a4z 0c can be determined experimentally.
$H_2SO_4$(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 ;r(:vgjd ycz22dzq*/ xhhw7 rand correct axis for ΔH in a graph to show how ΔH is affected by the length of the carbon chain.d2z*: v rhz 7wx2 qjd;y/rgch(

  The initial mass of a mortarv+pb j /ln)/kb containing a solid was recorded to be 109.34 g. The mortar was heated, and the final mass was recorded to be 81b /kn+pbj/l)v .92 g. What value should be recorded for the mass lost in grams?

  The half-life of a second ordewmi 9r a:erk66r reaction can be expressed according to the equation 9 mri:kwre6 a6below.
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 , :/fgc kfp2iaof 13.02 g and a volume of 13.4 cm$^3$. What is the most precise density that can be reported?

1.State the complete balanced e( c 5c+thxw4d kly-c9bquation for the reaction between sulphuric acid and copper y-+lx hct4(9cd5c kbw(II) 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, and wavelength, λ, is shown accordinm 6k+d;zhu:omtt.k4c-q ,i xqg/7ylwg to the equation z4mkq/l. 6u7ik:q ,to;dw-cmxgh t+ ybelow.
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 proceeding spontaneously can be bhrq*gx6s 6s sf .( tgp(szm+ckv5k-3predicted using the following equation: pvgsc s *(bkmzqt6-r s.3s 6k5+(xgfh
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-standard conditions caq c-,l(qac9. k)spi vtn be calculated using thl)c 9,vcsq ai (k.tq-pe Nernst equation:
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 r: wrj 11vnyw8feactant, A, and the time, for a second-order rj:n 8rfwy1w v1eaction can be expressed 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 givesniqr o1)*0,cv +x whh)fbu:in 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 threadhti. ooi7m7dxc+33j s was being measured using a 50 cm wooden ruler with a 1 mm increment. The reading for the beginning of the th+x3m7dt cisj h7.io3 oread was 12.6 cm while the reading for the end of the thread was 45.3 cm. Which of the following is the largest possible length of the thread?

  The ideal gas equation allows pressure t5e9d r-zmz8rr o be calculated according to the equatiozrdzr5r8- em9n,
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 m(rwq; q3;d)jsozn; ng. Which of the following is corren jns3wqz mr d;q;)o(;ct about the number of significant figures 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 measuringw2),jhzfh j2k85d kx e the density of a solution. He recorded the data in the followinge)8kzxh fd 2k,w25jjh table.

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.
   $\pm$    %