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- The grid below shows part of the periodic table. Use it to answer questions that follow. The letters do not represent the actual symbols of...(Solved)
The grid below shows part of the periodic table. Use it to answer questions that follow. The letters do not represent the actual symbols of the elements.
(a) (i) Which of the element has the lowest ionization energy?
(ii) Explain your answer in a(i) above.
(b) (i) Identify the most reactive non-metal.
(ii) Explain your answer in b(i) above.
(c) Give the electronic configuration of element.
(i) S
(ii) Q
(d) Compare the atomic radius of P and R. Explain.
(e) The mass number of W is 40. Write down the composition of its nucleus.
(f) Write formula of oxides of P.
(g) (i) What is the name given to elements found in the shaded region.
(ii) Which elements can be used to provide an inert environment?
Date posted: September 16, 2019.
- Use the graph below to answer the questions that follow.(Solved)
Use the graph below to answer the questions that follow.
(a) Calculate the difference in nitrate concentration between the highest and lowest.
(b) How can increase in nitrate concentration in the river lead to death of fish?
(c) Suggest one possible sources of nitrate that lead to the pollution in a river.
Date posted: September 16, 2019.
- R1 denotes reflection along line x=14.R2 denotes reflection along line x =2.T denote translation vector
[-1/2]
A triangle ABC has vertices A (1,4), B (3,4) and...(Solved)
R1 denotes reflection along line x=14.R2 denotes reflection along line x =2.T denote translation vector
[-1/2]
A triangle ABC has vertices A (1,4), B (3,4) and C (3,6)
(a)Show the image A1B1C1 under R1 (2mks)
(b)Find and draw A11B11C11 the image of A1B1C1 under R2. (3mks)
(c)Find and draw A11B11C11 the image of A11B11C11 under T. (3mks)
(d)Describe a single transformation which maps the object onto the final image.
Date posted: September 16, 2019.
- The diagram below shows a seed of a certain plant.(Solved)
The diagram below shows a seed of a certain plant.
(a) Name the likely agent of dispersal.
(b) Give a reason for your answer.
Date posted: September 16, 2019.
- (a) Using electrons in the outermost energy level, draw and cross (x) diagram for H3O+ and C2H4 (H = 1, C = 6,O =...(Solved)
(a) Using electrons in the outermost energy level, draw dots and crosses (x) diagram for H3O+ and C2H4 (H = 1, C = 6,
O = 16)
(b) What would be the effect of dipping litmus paper in aqueous solution of H3O+?
Date posted: September 16, 2019.
- Name the source of hydrochloric acid in the mammalian heart.(Solved)
Name the source of hydrochloric acid in the mammalian heart.
Date posted: September 16, 2019.
- A cattle dip is 150cm wide and 12m long. The depth of the water increases uniformly from a shallow end of 60cm to a maximum...(Solved)
A cattle dip is 150cm wide and 12m long. The depth of the water increases uniformly from a shallow end of 60cm to a maximum of 6m.
(a)Find the volume of water that can be held by the full dip in litres
(b)If the dip is drained by a pipe of radius 15cm at the rate of 6m/l, how long will it take to drain a full dip?
Date posted: September 16, 2019.
- Study the diagram and answer the questions that follow.(Solved)
Study the diagram and answer the questions that follow.
(a) State the division the organism belongs.
(b) Name the part labelled K.
(c) What is the function of the part labelled M?
Date posted: September 16, 2019.
- The diagram below represent large scale manufacture of hydrochloric acid.
Study it and answer the questions that follow.(Solved)
The diagram below represent large scale manufacture of hydrochloric acid.
Study it and answer the questions that follow.
(a) Identify.
(i) Gas A
(ii) Gas B
(b) Write the chemical equation for the reaction between gas A and B.
Date posted: September 16, 2019.
- The chemical equation below represents a physiological process that takes place in living organisms.(Solved)
The chemical equation below represents a physiological process that takes place in living organisms.
Name:
(i) The process R:
(ii) Substance Q:
Date posted: September 16, 2019.
- An equilateral triangle of sides 9cm is completely enclosed in a circle of radius rcm.Find the least value of r.(Solved)
An equilateral triangle of sides 9cm is completely enclosed in a circle of radius rcm.Find the least value of r.
Date posted: September 16, 2019.
- A variable u is partly constant and partly as the square of t. When t=2,u=0 and when t=1,u=3.Find
(a) the law connecting u and t.
(b) the value of...(Solved)
A variable u is partly constant and partly as the square of t. When t=2,u=0 and when t=1,u=3.Find
(a) the law connecting u and t.
(b) the value of u when t= 1/4
Date posted: September 16, 2019.
- In the fig.ABCDGH is a rectangular based wedge with AD=6cm and CD=15cm.The midpoint of AD is N and DG =GA=BH=HC =9cm.If GH =7cm, calculate the...(Solved)
In the fig.ABCDGH is a rectangular based wedge with AD=6cm and CD=15cm.The midpoint of AD is N and DG =GA=BH=HC =9cm.If GH =7cm, calculate the angle between planes ADG and the base ABCD.
![fig2016920191112.png](/questions/uploads/fig2016920191112.png)
Date posted: September 16, 2019.
- Explain how the Iris muscle controls the size of pupil when exposed to bright light.(Solved)
Explain how the Iris muscle controls the size of pupil when exposed to bright light.
Date posted: September 16, 2019.
- The equation below represent equilibrium reaction between chromate ions and dichromate ions.(Solved)
The equation below represent equilibrium reaction between chromate ions and dichromate ions.
State and explain the observation made if dilute sulphuric (VI) acid is added to the equilibrium mixture.
Date posted: September 16, 2019.
- Find the area of the region enclosed by the curve y=x-6 and the line x=-1 and x-2. (Solved)
Find the area of the region enclosed by the curve y=x-6 and the line x=-1 and x-2.
Date posted: September 16, 2019.
- Explain why tracheids are not efficient in transporting water up the plant.(Solved)
Explain why tracheids are not efficient in transporting water up the plant.
Date posted: September 16, 2019.
- The diagram below illustrates photographs of plants undergoing a certain process. Study them carefully and answer the questions that follow.(Solved)
The diagram below illustrates photographs of plants undergoing a certain process. Study them carefully and answer the questions that follow.
a) i) Name the process illustrated on the photograph.
ii) State two differences in the way the process occurs as illustrated in X and in Y.
b) i) State two roles of part C in the process illustrated above.
ii) State two external factors that are necessary for the process above to take place.
c) Name the parts labelled B and give its function
Name:
Function
d) Using observable features only, name the classes to which the specimen X and Y belong, giving one reason in each case.
![pic16920191035.png](/questions/uploads/pic16920191035.png)
Date posted: September 16, 2019.
- The position vector of A and B are a=4i+4j-6k and b =10i+4j+12k.D is a point on AB such that AD:DB is 2:1.Find the co-ordinates...(Solved)
The position vector of A and B are a=4i+4j-6k and b =10i+4j+12k.D is a point on AB such that AD:DB is 2:1.
Find the co-ordinates of D.
Date posted: September 16, 2019.
- A student was provided with 1.5g of XCO3. He reacted it with 50cm³ of 1M HCl which was excess. Determine the volume of CO2 produced...(Solved)
A student was provided with 1.5g of XCO3. He reacted it with 50cm³ of 1M HCl which was excess. Determine the volume of CO2 produced at S.T.P.
(R.F.M of x CO3 = 100) molar gas volume at S.T.P = 22400cm³.
Date posted: September 16, 2019.
- Simplify by rationalizing the denominator leaving your answer in surd form. (Solved)
Simplify by rationalizing the denominator leaving your answer in surd form.
![fig1616920191058.png](/questions/uploads/fig1616920191058.png)
Date posted: September 16, 2019.
- Find the equation of the locus of all points equidistant from P and Q where P(6,9) and Q(0,-5)(Solved)
Find the equation of the locus of all points equidistant from P and Q where P(6,9) and Q(0,-5)
Date posted: September 16, 2019.
- Mama Jeru deposited sh.1850 for 18 months at an interest rate of 16% p.a compounded half yearly.
How much interest did she pay at the end...(Solved)
Mama Jeru deposited sh.1850 for 18 months at an interest rate of 16% p.a compounded half yearly.
How much interest did she pay at the end of the of the period?
Date posted: September 16, 2019.
- Find the percentage error in calculating the volume of a sphere radius 4.9cm.(Solved)
Find the percentage error in calculating the volume of a sphere radius 4.9cm.
Date posted: September 16, 2019.
- Find the equation of the normal to the curve y=2x2+3x+4 at x=2 (Solved)
Find the equation of the normal to the curve y=2x2+3x+4 at x=2
Date posted: September 16, 2019.
- Expand up to the fifth term
Hence use your expansion to evaluate (2.5)5 to 3dp(Solved)
Expand
up to the fifth term
Hence use your expansion to evaluate (2.5)5 to 3dp
Date posted: September 16, 2019.
- In the figure below LM is a diameter of the circle and LMN is a straight line. The line PQR is a tangent to the...(Solved)
In the figure below LM is a diameter of the circle and LMN is a straight line. The line PQR is a tangent to the circle at Q.Angle NQR=320 and angle QML =500.
Calculate
(a) angle MQN
(b) angle QNM
Date posted: September 16, 2019.
- Make x the subject of the formula (Solved)
Make x the subject of the formula ![fig616920191032.png](/questions/uploads/fig616920191032.png)
Date posted: September 16, 2019.
- Solve for t given that(Solved)
Solve for t given that ![fig416920191027.png](/questions/uploads/fig416920191027.png)
Date posted: September 16, 2019.
- A shamba is in the shape of a parallelogram with the lengths of the adjacent sides being 12cm and 15cm.
If the area of the parallelogram...(Solved)
A shamba is in the shape of a parallelogram with the lengths of the adjacent sides being 12cm and 15cm.
If the area of the parallelogram is 72 cm2, find the angle between these two sides.
Date posted: September 16, 2019.