1. Write a balanced chemical equation:

1. Solid lead(II)sulfide reacts with aqueous HCL to form lead(II)Chloride and dihydrogen sulphide gas
2. Solid lithium oxide reacts liquid water to form aqueous lithium hydroxide
3. Chlorine gas reacts with aqueous potassium iodide to form solid iodine and aqueous potassium chloride.
4. Gaseous dinitrogen pentoxide decomposes to form nitrogen dioxide gas and oxygen gas
5. Gaseous carbon monoxide reacts with hydrogen gas to form gaseous methane (CH₄ )and liquid water

2. Balance the equation:

H₂(g) + N₂(g) →NH₃(g)

HCl(aq) + O₂(g) →H₂O(l)+Cl₂(g)

H₂ (g) + Cl₂(g) →HCl(g)

3. Write complete ionic and net ionic equations and identify spectator ions and type of reaction:

1. AgNO₃(aq) + KCl(aq) →AgCl(s) + KNO₃(aq)
2. CaS(aq) +CuCl₂(aq) →CuS(s) +CaCl₂(aq)
3. Na₂SO₄(aq) +CaI₂(aq) →CaSO₄(s) +2NaI(aq)

4. What is false about acids and bases:

Acids turn litmus blue                               bases turn litmus blue

Aids produce H+                                         Bases produce H+

Acids are sour to taste                              bases are bitter to taste

Acids are corrosive                                    bases are soapy in texture

1. Steel tapes must be maintained and checked regularly for damages such as kinks and breakages. If a damaged steel tape is used for measurements describe the type of error(s)that would be observed. (0.5marks)

2. To meet the tolerance required for a surveying project, it is necessary to use a total station. An obstacle makes it impossible to obtain a direct line of sight. Explain one technique that you would use to establish the line of sight past the obstacle. Use a sketch if necessary (0.5marks)

3.Watch the video below which demonstrates the process of transferring levels or elevations.

https://www.youtube.com/watch?v=hAN9SAR7RZ4a.

a.Identify all the safety precautions taken by the survey crew.(1 mark)

b.The lead surveyor describes at least four challenges that the survey crew had to overcome during the survey process. Identify these challenges, and describe the errors associated with them. (1 mark)

c.Identify all activities performed by the survey party to ensure accuracy. Classify these activities according to the categories outlined in the Guidelines for Accurate Surveying. (3marks)

4.A surveyor completes a levelling circuit from a known BM at point A ( RL = 37.730 m). At the end of the survey, the surveyor finds out that the rod person moved the graduated staff before a BS value was taken at the third change point. The levels obtained are as follows: 1.857 ( RL = 37.567 m), (0.983, 0.354), 0.571, 1.011, 2.151, (1.124, x), 0.890, (0.543, 3.178), 3.808.

a.Assuming that the misclosure for the level circuit is 0.000 m, find the probable value of the missing BS value x.(2marks)

b.Is the value of x in part (a) acceptable? Explain.(1mark)

c.Book the levels, including the value of x calculated in part (a) using the HPC method and show all arithmetic checks. (1mark)

5.A surveyor conducted a cadastral survey of a property outlined by survey pegs at points A, B, C and D.The total station was used to measure the length of lines AB and DA however due to battery failure, lines BC and CD were measured using asuspended30-metre steel tape. The measurements obtained are given in the table below:

a.If the tape was standardised under a tension of 50 N at 20°C, apply the necessary corrections and compute the actual length of lines BC and CD.(1mark)

b.It is known that angle DAB is 102°15′40′′. After the survey, it is observed that the total station at point A is off the survey peg, coinciding with a point A′such that angle DA′B is 102°26′42′′. Find the length of distance AA′.(2mark)

c.Determine the actual length of lines AB and DA. (2marks)

Take:

Gravitational acceleration,g= 9.81 m/s2

Cross-sectional area of the tape, A= 3.15 mm2

Mass of the tape, m= 0.02 kg/m

Coefficient of linear thermal expansion, K= 0.9 × 10–6per °C

Young’s modulus, E= 14.8 × 104MN/mm2

Explain the “one gene – one enzyme hypothesis” and describe the experiments that led to the development of this theory.

what is the actions of ACE (Angiotensin-converting-enzyme) inhibition in patients with renal artery stenosis?

What are enzymes? What is the active site of an enzyme? What does the term substrate mean?

27. Explain the reaction that had to occur to detect the free indole (substrate, enzyme, and products)

What assumption concerning substrate concentration is made in the discussion of enzyme kinetics? Why is this important?

If the phosphoglycerate mutase reaction the side chain of which as in thE enzyme is transiently phosphorylated as part of the reaction .,