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Because motors uses fuel that contains lead. Sukuma wiki on roadside absorbs lead particles and become part of it. When consumed it enters the blood stream and interferes with body function.
NEKOYEA answered the question on November 16, 2018 at 12:00
- Explain why the ionic radius of potassium is greater than that of sodium(Solved)
Explain why the ionic radius of potassium is greater than that of sodium.
Date posted: November 14, 2018. Answers (1)
- What is ionization energy?(Solved)
What is ionization energy?
Date posted: November 9, 2018. Answers (1)
- With reference to chlorine, distinguish between covalent bond and van der Waals forces(Solved)
With reference to chlorine, distinguish between covalent bond and van der Waals forces.
Date posted: November 7, 2018. Answers (1)
- Outline four pustules with reference to Dalton's atomic theory(Solved)
Outline four pustules with reference to Dalton's atomic theory
Date posted: October 26, 2018. Answers (1)
- Describe how Sulphur IV Oxide bleaches(Solved)
Describe how Sulphur IV Oxide bleaches.
Date posted: October 23, 2018. Answers (1)
- Discuss the general clay colloids properties.(Solved)
Discuss the general clay colloids properties.
Date posted: October 19, 2018. Answers (1)
- Discuss the eight main steps a form four student ought to follow when determining the concentration of an acid using a known base in the...(Solved)
Discuss the eight main steps a form four student ought to follow when determining the concentration of an acid using a known base in the lab.
Date posted: October 13, 2018. Answers (1)
- Explain how the following occurs by definition as learned in chemistry.
Exchangeable ions.
Exchangeable sodium percentage.(Solved)
Explain how the following occurs by definition as learned in chemistry.
Exchangeable ions.
Exchangeable sodium percentage.
Date posted: October 12, 2018. Answers (1)
- In details describe the following terms as used in physical and biological chemistry.
a)Base saturation percentage.
b)Bioaugmentation.
c)Cat clays.(Solved)
In details describe the following terms as used in physical and biological chemistry.
a)Base saturation percentage.
b)Bioaugmentation.
c)Cat clays.
Date posted: October 12, 2018. Answers (1)
- Explain titration process
(Solved)
Explain titration process
Date posted: October 8, 2018. Answers (1)
- List the main eleven soil materials as studied in soil chemistry.(Solved)
List the main eleven soil materials as studied in soil chemistry.
Date posted: October 8, 2018. Answers (1)
- Explain why graphite is a poor conductor of electricity at high temperature(Solved)
Explain why graphite is a poor conductor of electricity at high temperature
Date posted: October 8, 2018. Answers (1)
- Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous
B. Bromine
C. Chlorine
D. Helium(Solved)
The answer is B.
Bromine has boiling point of 58.78 and has -7.2 melting point
Date posted: September 30, 2018. Answers (1)
- Which gas in the air make Brass get discoloured when they react?(Solved)
Which gas in the air make Brass get discoloured when they react?
Date posted: September 30, 2018. Answers (1)
- State two main uses of sodium hypochlorite(Solved)
State two main uses of sodium hypochlorite
Date posted: September 25, 2018. Answers (1)
- Describe how one can collect dry oxygen after preparation(Solved)
Describe how one can collect dry oxygen after preparation
Date posted: August 22, 2018. Answers (1)
- A student was provided with the following chemicals. Describe consecutively how to test presence of nitrates in sample solution (Solved)
A student was provided with the following chemicals
•4 cm^3 sample solutions in a test tube(KNO3)
•1M Sodium hydroxide
•Aluminium foil
•Source of heat
•Red and blue litmus paper
•Distilled water
Describe consecutively how to test presence of nitrates in sample solution
Date posted: August 22, 2018. Answers (1)
- Give two factors one should consider in siting carbonate manufacturing plant(Solved)
Give two factors one should consider in siting carbonate manufacturing plant
Date posted: August 22, 2018. Answers (1)
- The following are steps carried by a student during a chemistry practical to determine the concentration of an acid using...(Solved)
The following are steps carried by a student during a chemistry practical to determine the concentration of an acid using a known concentration of a base. Study the steps and answer the questions that follows(note:Steps are not consecutively)
(a) Rinse conical, pipette and burette using distilled water
(b)Assemble apparatus required set them
(c) Pour HCL to a burette
(d) Put a funnel on top of a burette
(e) Open burette tap to adjust volume of acid to a mark
(f) Add three drops of phenolphthalein indicator into conical flask.
(g) Titrate burette contents(acid) against conical contents(base) until the pink colour just disappear
(h) Suck 1M sodium hydroxide using pippete
and transfer to conical flask.
(I) Record the volume of acid used and repeat the procedure.
Questions
(I)Using alphabets (a-i) give the correct order of steps
(II) Why is it necessary to add an indicator to contents in conical flask and not the ones in burette?
(III) How can one determine end point?
(Iv) Write balance equation between acid and base
Date posted: August 20, 2018. Answers (1)
- (a) Define the following terms (I) Molar mass (II) A molar solution (III)Standard Solution (Iv)End point(Solved)
(a) Define the following terms(4mks)
(I) Molar mass
(II) A molar solution
(III)Standard Solution
(Iv)End point
Date posted: August 20, 2018. Answers (1)