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- The figure below shows a circle with secants ABE and CDE, if AB = 4cm and BE = 6cm and DE =...(Solved)
The figure below shows a circle with secants ABE and CDE, if AB = 4cm and BE = 6cm and DE = 4cm. find the length of CD.
![fig9117920191315.png](/questions/uploads/fig9117920191315.png)
Date posted: September 17, 2019.
- Find the value of X in the equation ( log3X)2 + 3 log 3X = 4(Solved)
Find the value of X in the equation ( log3X)2 + 3 log 3X = 4
Date posted: September 17, 2019.
- Nairobi and Kisumu lie on the same longitude. The latitude of Nairobi is 1o12’s and that of Kisumu is 5o50’N. Calculate the distance between them...(Solved)
Nairobi and Kisumu lie on the same longitude. The latitude of Nairobi is 1o12’s and that of Kisumu is
5o50’N. Calculate the distance between them in nautical miles
Date posted: September 17, 2019.
- Find the distance between the centre A of a circle whose equation is 2x2 + 2y2 + 6x + 10y + 7 = 0 ...(Solved)
Find the distance between the centre A of a circle whose equation is 2x2 + 2y2 + 6x + 10y + 7 = 0 and the point B ( -4 ,1).
Date posted: September 17, 2019.
- There are three athletes A,B, C in a 100m race. A is twice as likely to win as B, while B is twice as...(Solved)
There are three athletes A,B, C in a 100m race. A is twice as likely to win as B, while B is twice as likely to win as C. Find the probability that A does not win the 100m race.
Date posted: September 17, 2019.
- Complete the table below for mineral nutrients in plants.(Solved)
Complete the table below for mineral nutrients in plants.
![pic17920191257.png](/questions/uploads/pic17920191257.png)
Date posted: September 17, 2019.
- The diagram below represents a bone in a mammal.(Solved)
The diagram below represents a bone in a mammal.
a) Identify the bone.
b) Name the bone that articulate with the above bone at part A.
c) Name the joint formed at the part labeled B.
Date posted: September 17, 2019.
- You are provided with the following electrode potentials of four half-cell reactions. Letters do not represent the actual symbol of the element(Solved)
You are provided with the following electrode potentials of four half-cell reactions. Letters do not represent the actual symbol of the element
(a) Identify the strongest reducing agent. Explain.
(b) Calculate the emf of the two half cells that when combined would produce the largest emf.
Date posted: September 17, 2019.
- Taps A and B can fill a tank in 4 and 9 hours respectively. Both taps are turned on for 2 hours after which ...(Solved)
Taps A and B can fill a tank in 4 and 9 hours respectively. Both taps are turned on for 2 hours after which tap A is closed. Find how long tap B takes to fill the remaining part of the tank
Date posted: September 17, 2019.
- A compound with the formula X (OH)3(not its actual chemical formula) reacts as shown below
(Solved)
A compound with the formula X (OH)3(not its actual chemical formula) reacts as shown below
a) State the name of compounds that behave like X(OH)3 in the two reactions above
b) Name two elements whose hydroxides behave like that of X
Date posted: September 17, 2019.
- The structure below represents a portion of polyphenylethene.(Solved)
The structure below represents a portion of polyphenylethene.
Draw the structure of the monomer and name it.
Date posted: September 17, 2019.
- In the figure below, A triangle A1B1C1 is the image of triangle ABC under a rotation centre O.
By constructor, find and label centre...(Solved)
In the figure below, A triangle A1B1C1 is the image of triangle ABC under a rotation centre O.
By constructor, find and label centre O. Hence determine the angle of rotation.
![fig8417920191237.png](/questions/uploads/fig8417920191237.png)
Date posted: September 17, 2019.
- Draw the structures of the following compounds.
i) Ethylbutanoate
ii) 3-ethyl – 3 – methyl hexane(Solved)
Draw the structures of the following compounds.
i) Ethylbutanoate
ii) 3-ethyl – 3 – methyl hexane
Date posted: September 17, 2019.
- The standard electrode potentials for certain half cell reactions are shown below.(Solved)
The standard electrode potentials for certain half cell reactions are shown below.
(a) (i) Identify the strongest oxidizing agent.
(ii) Write the cell equation for a cell formed by connecting W and X cells.
(iii) Calculate the e.m.f of cell in a(ii) above.
(b) During electrolysis of silver nitrate, a current of 0.5A was passed through the electrolyte for 3 hours.
(i) Write the equation for the reaction which took place at the anode.
(ii) Calculate the mass of silver deposited. (Ag = 108, IF = 96500C)
(iii) Give two reasons why it is necessary to electroplate iron with silver.
Date posted: September 17, 2019.
- The diagram below illustrates part of a human skin.(Solved)
The diagram below illustrates part of a human skin.
a) State the function of each of the part labeled A.
b) State the actions of each of the following parts when the body temperatures fall below the normal.
i) Part B
ii) Part C
c) How does the part labeled D help in osmoregulation.
d) Explain one biological mechanism through which the skin offers protection to the body.
Date posted: September 17, 2019.
- A sample of air contains nitrogen, oxygen and argon. Describe how oxygen gas can be obtained.(Solved)
A sample of air contains nitrogen, oxygen and argon. Describe how oxygen gas can be obtained.
Date posted: September 17, 2019.
- 100cm3 of0.05M Sulphuric (VI) acid were placed in the flask and small quantity of potassium Carbonate added. The mixture was boiled to expel all carbon...(Solved)
100cm3 of0.05M Sulphuric (VI) acid were placed in the flask and small quantity of potassium Carbonate added. The mixture was boiled to expel all carbon (IV) oxide. 25cm3 of the resulting solution required 18cm3 of 0.1M potassium hydroxide solution to neutralize it. Calculate the mass of potassium carbonate added. (K = 39, O = 16, C = 12)
Date posted: September 17, 2019.
- 12.3.0g of an organic compound containing Carbon, hydrogen and oxygen only produced 4.4g of Carbon (IV) oxide and 1.8g of water on complete combustion.
a) Calculate...(Solved)
12.3.0g of an organic compound containing Carbon, hydrogen and oxygen only produced 4.4g of Carbon (IV) oxide and 1.8g of water on complete combustion.
a) Calculate its empirical formula.
b) Calculate in molecular formula if its formula mass is 60.
Date posted: September 17, 2019.
- If (x + 3) ( x + 4) is equivalent to ( x + a)2+b. Find the values of a and...(Solved)
If (x + 3) ( x + 4) is equivalent to ( x + a)2+b. Find the values of a and b.
Date posted: September 17, 2019.
- Four cylinders of potato were carefully dried on blotting paper and weighed. Each piece weighed 3g. One was placed in each as shown in the...(Solved)
Four cylinders of potato were carefully dried on blotting paper and weighed. Each piece weighed 3g. One was placed in each as shown in the drawing below.
a) After 48hours, which potato would be the heaviest
b) Name the substance whose movement was responsible for the weight changes in potato cylinders.
c) Name the process which was responsible for this movement in tubes B, C and D.
Date posted: September 17, 2019.
- Two variables P and Q are such that P varies partly as Q and partly as the square root of Q. Determine
the...(Solved)
Two variables P and Q are such that P varies partly as Q and partly as the square root of Q. Determine
the equation connecting P and Q when Q = 16, P = 500 and when Q = 25, P = 800.
Date posted: September 17, 2019.
- The products formed by action of heat on nitrates of element X, Y and Z are shown below.(Solved)
The products formed by action of heat on nitrates of element X, Y and Z are shown below.
a) Arrange the metals in order of increasing reactivity.
b) Which element forms a soluble carbonate?
c) Give an element that can be Y.
Date posted: September 17, 2019.
- The following chart illustrates the quantity of urine passed out by three animals of different species in different habitat.(Solved)
The following chart illustrates the quantity of urine passed out by three animals of different species in different habitat.
a) Name the forms in which the following organisms are likely to excrete their nitrogenous wastes.
Animal B
Animal C
b) Give two structural modification of the animal B that enables it to survive in its habitat.
Date posted: September 17, 2019.
- The figure below represent a solid frustum. The faces ABCD and EFGH are parallel squares of sides 10cm and 6 cm respectively. Each...(Solved)
The figure below represent a solid frustum. The faces ABCD and EFGH are parallel squares of sides 10cm and 6 cm respectively. Each of the slanting edges AE, BF, CG and DH are equal to 4cm.
Determine:
a)The length of the projection of AE on the plane ABCD
b)The angle between the line AE and the plane ABCD
c)The angle between the plane BCGF and ABCD
Date posted: September 17, 2019.
- a) Draw a diagram to show how an iron ring can be electroplated with pure silver.
b)Give two reasons why electroplating is necessary.(Solved)
a) Draw a diagram to show how an iron ring can be electroplated with pure silver.
b)Give two reasons why electroplating is necessary.
Date posted: September 17, 2019.
- Consider the flow chart below; use it to answer the questions that follow.(Solved)
Consider the flow chart below; use it to answer the questions that follow.
(i) State the most likely identity of solid F.
(ii) Write the chemical equation for the reaction between solid F and concentrated nitric (v) acid.
(iii) Name
Solution N
Solution H
(iv) Write the formula of solution N.
Date posted: September 17, 2019.
- A bag contains blue, green and red pens of the same type in the ratio 8:2:5 respectively. A pen is picked at random without...(Solved)
A bag contains blue, green and red pens of the same type in the ratio 8:2:5 respectively. A pen is picked at random without replacement and its colour noted.
a)Determine the probability that the first pen picked is
i)Blue
ii)Either green or red.
b)Using a tree diagram, determine the probability that
i)The first two pens picked are both green
ii)Only one of the first pens picked is red.
Date posted: September 17, 2019.
- Propane is a hydrocarbon. What does the term hydrocarbon mean?(Solved)
Propane is a hydrocarbon. What does the term hydrocarbon mean?
Date posted: September 17, 2019.
- Lengths of 100 mango leaves from a certain mango tree were measured to the nearest centimeter and recorded as per the table below,
a) draw a...(Solved)
Lengths of 100 mango leaves from a certain mango tree were measured to the nearest centimeter and recorded as per the table below,
a) draw a cumulative frequency graph to represent this data.
b)Use your graph to estimate
i)The median length of the leaves
ii)The number of leaves whose lengths lie between 13cm and 17cm.
Date posted: September 17, 2019.
- Name the class to which the following cleansing agents belong.(Solved)
a)Name the class to which the following cleansing agents belong.
b) Which cleaning agent between (i) or (ii) above is preferred for cleaning garments while using water from a dam containing dissolved calcium chloride? Explain
Date posted: September 17, 2019.