A voltmeter reading is recorded as 100mvl/ pa. chk8t4y5+6b ,qlgmu.0 V +/- 2%. Which of the following could be tkm l 6uvmyl5c8b,4pa/ gt +qh.he actual value?

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

  A student recorded the volume of a gas as 0.04056msvaq . yghy,(5$^3$. How many significant figures does the recorded value have?

  Which of the below fe rq,,+; mfq:oibxa2 v9wkbrm:atures must be 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-interc;gbyvv cpq5(fx4 kqggx4at1 yq 8d.2-ept.

  Which statement best describesk0ya( p/:rm n5,xw0 zj3l(sgc enw7 tz the relationship between x and y on the graph beloajrnec:mg7(y(zxs p ,w3nz/ 0tk 0lw5w?

For a first order reaction, the relationsh,) .vca7+usjyb :u7md )eg gt4 o ze4k-lgiv/nip between rate and the concentration of a reactant, [A], can be shown b4+cz gt-7ae7ukn d,)y.s /ug:mv gev l) o4ijusing 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 gi;:-frk1x0-wgjny wj; d2vp nsves the correct units for the gradient of this line?

  A student is measuring the temperature change of an endotherm q59sk w9:mal-kekuh 8ic 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 +;h4kw;rmn e. nkc sdk)ux3a-volume and amount of gas can be described using Gay-Lussac’s law which states that pressure is directly proportional to temperature.P∝T ha-kx;3+erd mk) 4k ;c .snuwn
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 the graph beloz 1qmi82hib f6w 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 relationship between the rate an5r 8ci+sf o0iyd H$^+$ oncentration, in a graph with the equation: rate =k[H$^+$]$^2$?

  In a first order reaction, the concen ivcma ked23n/q34p ;otration [A] of a given reactant can be dete33 dvkoc 2mei4;/ paqnrmined at time t, according 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 sulfufr92v ;pufm7k ric acid and potassium hydroxide can be determined exp9f v2f ;u7pmkrerimentally.
$H_2SO_4$(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 ΔH8sygotl -w tx(l*8lx8 in a graph to show how ΔHot l (sxlg8xtwl* 88-y is affected by the length of the carbon chain.

  The initial mass of a mortar containing a solid was recorded to be 109 yi c 2+k,2:.u-yoc(rqd aqhba.34 g. The mortar was heari 22cq( .obk,y:yau -ca+dqhted, 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 second order70 efas 4l56 -wjhyq*iyulw*(kk. y rc reaction can be expressed according to the equation qc.rfeia yy4*kwwhl5y7lju0 *-(6s k below.
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 q9fo:,eu czpx .cxx7 pbl6 7uv.yls:i/ 9gp4d mass of 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 equation for the reaction between suvux-kqsy6jww 7rcryg),/4z, lphuric acid and coppc-rsj ,y k,x wzyv) rqw47g6/uer (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 dh)dhh7 ui2,wzzo 8u:energy, E, and wavelength, λ, is shown according to the equationi 8ud72ohwuhdhz), z: 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 proceeding ssf1;-lb,evn rpontaneously can be predicted using the following equation: f1,b ;eslvn r-
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-standa3*u* z7ov qqsjrd conditions can be calculated using the Nernst eo*q7q*vs u3jz quation:
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, A, and j( lx6 c./doj0x q7fmbthe time, for a second-order reaction can be expressed using thexxjb/07qdcf6o lm.( j 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 gives the correct average titre with f cg m8f:u8 )l-utkt;fq*2fsz 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 ai qzijp7(g7;g 50 cm wooden ruler with a 1 mm increment. The reading for the beginning of the thre;g7(7j qz igpiad 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 to be calculated according d n(v;c3rhb1u to the equation, ;d1v r3n ch(ub
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 120qvb/08s6zo.l. yo g xe0 g. Which of the following is correct about .sg qov.8xz 0 ey6l/bothe 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 measuring the density of a solution. He recorded the data in the foqj xqd86 v*p6ah:j 4oullowing tabl:ajvd4o 8u6q hpqx *j6e.

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.
   $\pm$    %