1. A thermometer was used to record the temperature of pure boiling water at sea level three times and the values were: 85.6∘C, 85.7∘C, 85.5∘C. What can be said about the accuracy and precision of these values?

2. The diameter of a cylindrical sample was measured using a vernier caliper at three different points along the sample. The diameters measured were: 13.50 mm, 13.51 mm. The true diameter of the sample is 12.14 mm. What is the likely type of error, and how can the error be reduced?

3. The initial mass of a mortar containing a solid was recorded to be 109.34 g. The mortar was heated, and the final mass was recorded to be 81.92 g. What value should be recorded for the mass lost in grams?

4. Which statement best describes the relationship between x and $y$ on the graph below?

5. A student recorded the volume of a gas as 0.04056m^3. How many significant figures does the recorded value have?

6. 2.00 $\pm$ 0.02 $g$ NaClO3​ were dissolved in 2.0 $\pm$ 0.5 dm^3 distilled water.

Which row gives the correct concentration in g dm−3 and relative uncertainty?

• 	Concentration (g dm^−3)	Relative uncertainty
  A.	1.00	$\pm$ 0.25
  B.	1.0	$\pm$ 0.3
  C.	1.00	$\pm$ 0.3
  D.	1.0	$\pm$ 0.25

7. A student recorded the mass of solid NaCl as 1200 g. Which of the following is correct about the number of significant figures recorded?

8. What is the value for the gradient of the graph below with the correct units?

9. Which statement best describes the relationship between the rate and H^+ concentration, in a graph with the equation: rate =k[H+]^2 ?

10. The ideal gas equation allows pressure to be calculated according to the equation,
P=nRT/V.
This allows a straight line to be drawn for the effect of V1​ on $P.$

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

• 	Gradient	$y$-intercept
  A.	$nRT$	$V$
  B.	nRT	0
  C.	1/V​	P
  D.	nRT/V​	P

11. Which of the below gives the correct average titre with its uncertainty?

12. 10cm3 of an aqueous solution of $\mathrm{l}$ with $\mathrm{pH}$ 1.0 is mixed with 990 cm^3 of water. The $\mathrm{pH}$ of the formed solution is:

13. For the graph below, state the appropriate units for the $y$-intercept.

14. Which of the following is correct?

15. The length of a thread was being measured using a 50 cm wooden ruler 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 possible length of the thread?

16. 25.00 cm^3 of 0.100 mol dm^−3 HNO3 was titrated against 0.200 mol dm^−3 NaOH. The volumes of NaOH delivered for the three trials 14.00 cm^3, 14.05 cm^3 and 14.00 cm^3.

Which statement below best describes these results?

17. Which of the following features must be included in a sketched graph?

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

18. The relationship between energy, $E$, and wavelength, $\lambda$, is shown according to the equation below.

Which of the below statements are correct for the graph below representing E=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

19. A voltmeter reading is recorded as 100.0 V +/- 2%. Which of the following could be the actual value?

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

20. The half-life of a second order reaction can be expressed according to the equation below.

21. Which of the below gives the correct units for the gradient of this line?

22. In a first order reaction, the concentration [A] of a given reactant can be determined at time $t$, according to the equation below, where [A]o​ is the initial concentration of A and $k$ is the rate constant.

For the graph above of ln[A] vs $t$, which feature is equal to ln[A]o​?

23. Determine the type of variable and correct axis for $\Delta \mathrm{H}$ in a graph to show how $\Delta \mathrm{H}$ is affected by the length of the carbon chain.

• 	Type of Variable	Axis
  A.	Independent	$x$
  B.	Independent	y
  C.	Dependent	x
  D.	Dependent	y

24. The potential of a cell under non-standard conditions can be calculated using the Nernst equation:

25. A student conducted a titration experiment. However, instead of rinsing his apparatus with distilled water, he rinses them with tap water only. What is likely the type of error?