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Production of hydrogen iodide can be demonstrated by the equation below
Explain how the following would affect the yield of hydrogen iodide.
(i) Increase in temperature
(ii) Decrease in pressure
Date posted:
September 3, 2019
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The table below shows elements in the halogen group of the periodic table. Study the table and answer the questions that follow.
(i) Name the element likely to be a solid at room temperature. Explain
(ii) Explain why the melting point increases from fluorine to iodine.
Date posted:
September 3, 2019
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Two gases A and B have relative densities of 1.98 and 2.90 respectively. They diffuse under the same conditions.
(i) Compare their rates of diffusion
(ii) Determine the relative molecular mass of A, given that the relative molecular mass of B is 64.
Date posted:
September 3, 2019
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The diagram below shows a frustrum made by cutting of a small cone on a plane parallel to the base of
the original cone. The frustrum represents a bucket with the open-end diameter of 28cm and the bottom diameter of 21cm. The bucket is 20cm deep. Calculate to 1 decimal place, the capacity of the bucket in litres.
Date posted:
September 3, 2019
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(a)The figure below shows a metal solid consisting of a right cone mounted onto a hemisphere. The height h of the cone is twice the radius r. if the volume of the solid is 36cm3, find the radius of the hemisphere.
(b) The solid is totally immersed in water contained in a cylindrical tin of radius 9cm. through what height does the water level in the tin rise.
(c) The solid is melted and recast into a right pyramid of vertical height 4.2cm. Find the base area of the pyramid.
(d) If the solid is of mass 14.4g. Find its density in kg/m3.
Date posted:
September 3, 2019
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Five towns A,B,C,D and E are such that B is on a bearing of 040o and 6km from E. D is due west of E on a bearing of 340o from E. A is due North of E on a bearing of 045o from D. C is on a bearing of 250o from B and due North of E.
(a) Make a scale drawing showing the positions of the five towns.(Use a scale of 1cm to represent 1km)
(b) Use your drawing to determine;
(i) the bearing and distance of B from A.
(ii) the bearing and distance of C from D.
(iii) the distance between A and E.
Date posted:
September 3, 2019
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When excess chlorine is bubbled through cold dilute sodium hydroxide solution, the resulting solution is a bleaching agent.
(a) Write a chemical equation for the reaction that produces the bleaching agent.
(b) Name the bleaching compound and show how it bleaches using an equation.
Date posted:
September 3, 2019
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Using the accounting equation, fill in the missing figures in the following table.
Date posted:
September 3, 2019
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In order to prepare hydrogen gas in the laboratory a student set-up the apparatus shown in the diagram below. Study it and answer the questions that follow.
(a) Suggest why the student did not collect hydrogen gas.
(b) In a separate experiment the student reacted iron and hydrochloric acid to prepare hydrogen gas.
(i) Write an ionic equation for the reaction.
(ii) The hydrogen gas produced was found to have a foul smell. Suggest an explanation for this.
Date posted:
September 3, 2019
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Give four reasons that make insurance companies decline to insure acts of nature.
Date posted:
September 3, 2019
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A milk vendor bought 20 litres of milk at Ksh.15 per litre and added 5 litres of water to the milk. If he
sold the mixture at Ksh.18 per litre, what was the percentage profit.
Date posted:
September 3, 2019
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Study the flow chart below and answer the questions that follow.
(a) Write the formula of the anion present in solid N.
(b) Solid N in the flow chart above burns in air with a red flame. Identify the
(i) Cation present in solid N
(ii) Metal oxide L
Date posted:
September 3, 2019
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Identify the silent letters in the following words .
i. Debut ...................
ii. Chassis ....................
iii. Crochet ..............
v Rendezvous .............
iv. Poignant.........................
Date posted:
September 3, 2019
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Read the excerpt below and answer questions that follow.
Mrs. Linde: Nora-it was Krogstad who lent you the money!
Nora: Yes, and now Torvald will know all about it.
Mrs. Linde: Believe me, Nora, that’s the best thing for both of you.
Nora: You don’t know all. I forged a name.
Mrs. Linde: Good heavens-!
Nora: I only want to say this to you, Christine- you must be my witness.
Mrs. Linde: Your witness? What do you mean? What am I to -?
Nora: If I should go out of my mind-and it might easily happenMrs. Linde: Nora!
Mrs. Linde: Nora! Nora! You are quite out of your mind.
Nora: And if it should happen that there were someone who wanted to take all the responsibility,
all the blame, you understandMrs. Linde: Yes, yes- but how can you suppose-?
Nora: Then you must be my witness, that it is not true, Christine. I am not out of my mind at all; I
am in my right senses now, and I tell you no one else has known anything about it; I and I alone,
did the whole thing. Remember that.
Mrs. Linde: I will, indeed. But o don’t understand all this.
Nora: Or if anything else should happen to me- anything, for instance, that might prevent my being here-
Questions
i) Briefly explain what has happened before this extract.
ii) 'Nora- it was Krogstad who lent you the money!' Explain the tone in Christine’s
words.
iii) 'Believe me Nora, that’s the best thing for both of you.' From later in the play which reason does Mrs. Linde give to support what she says now?
v) Discuss one character trait of Nora evident in this extract.
v) Discuss one social theme raised in this extract.
vi) 'Nora! Nora! You are quite out of your mind.' Add a question tag.
vii) Discuss one aspect of style in this extract.
viii)Nora says that a wonderful thing is going to happen. From the rest of the play, explain what she means by that.
ix)Explain the meaning of the following phrases as used in the extract.
a) Go out of mind
b) I forged a name
c) You will be my witness
Date posted:
September 3, 2019
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Read the passage bellow and answer the questions that follow.
Problem drinkers and alcoholics pay severe penalties for their drinking. It has been estimated that alcoholics are likely to die ten to twelve years sooner than non-alcoholics half die before the age of fifty, which is one reason there are so few elderly alcoholics. The mortality rate (that is, the number of persons per 100,000 who die each year) among alcoholics is more than two and a half times higher than that of the general population. Alcoholics often die violent circumstances; serious accidents, homicide, and suicide are not uncommon. This, together with the physical deterioration accompanying alcoholism, helps explain the limits on life expectancy. No one really knows how many deaths are directly attributed to drinking, and all such statistics are estimates. One reason for our limited knowledge is that many physicians do not report alcoholism as the main cause of death out of concern for the feelings of the family of the deceased. Research on the physiological effects of alcoholism has increased in the last few years. Heavy drinking is known to be associated with various types of cancer, particularly among persons who also use tobacco. Alcohol abuse also increases the probability of hypertension, stroke and coronary heart disease. Alcoholics frequently suffer illness and death from cirrhosis of the liver, a disease in which the liver becomes fatty, scarred, and incapable of functioning normally. In large urban areas, cirrhosis is the fourth most common cause of death among men aged twenty-five to forty-five. Alcohol affects the brain, often permanently damaging the mental functioning of alcoholics. Drinking may reduce the number of living cells in the brain. Since brain cells do not grow back, alcoholics may suffer from organic psychosis (a mental illness traceable to brain damages), loss of
memory, and poor physical and mental co-ordination. One out of four persons who are admitted to mental hospitals are diagnosed as alcoholics and 40 percent of all admissions are alcohol related. Many of the alcoholic inmates are unlikely to recover.
The unborn children of female alcoholics are subject to harm from drinking in what is called foetal alcohol syndrome. Because alcohol tends to be a substitute for a balanced diet, alcoholics are often malnourished. Consequently, the infants of alcoholic women are likely to be less healthy and less well developed than other babies. Moreover, when a pregnant woman drinks, so, in effect, does her foetus. The new born children of alcoholic women may die shortly after birth unless they are medically treated
from the shock to their systems for suddenly being cut off from alcohol. Furthermore, the impact of alcohol on the woman and her foetus is a major cause of birth defects and originally based mental eficiency among the newborn. The effects of foetal alcohol syndrome on the children of female alcoholics are usually chronic and may be permanently disabling. Clearly, it is not too much of an exaggeration to say that alcohol kills and maims people. When abused, alcohol is a highly dangerous drug
Questions
(i) What are the major causes of death among alcoholics?
(ii) Which reason does the writer give as to why physicians do not report alcoholic related deaths?
(iii) One out of four persons who are admitted to mental hospitals are diagnosed as alcoholics.
(Rewrite using a few.......)
(iv) Alcoholics often die under violent circumstances…. (Add a question tag)
(v) What is the attitude of the writer towards people who abuse alcohol
(vi) Explain what the following sentence means. Alcohol tends to be a substrate for a balanced diet
(vii) Make notes on the effects of alcohol to expectant mothers and their children
(viii) Supply a suitable title for the passage
(ix) Explain the meanings of the following words and phrases as used in the passage
a) Attributable
b) Scarred
c) Statistics
Date posted:
September 3, 2019
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State four circumstances under which photocopying may be used to reproduce documents in a school.
Date posted:
September 3, 2019
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Give the I.U.P.A.C name of the oxide of nitrogen that:-
(i) Relights a glowing splint
(ii) Forms brown complex compound with acidified Iron (II) sulphate solution
(iii) Reacts with water to form nitric (V) acid
Date posted:
September 3, 2019
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Find the percentage error in the perimeter of a regular polygon whose side is 15.0cm.
Date posted:
September 3, 2019
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On 1st of October 2009 Sambu bought goods on credit quoted at Kshs.240,000. Terms of sales were 20% trade discount and 10% cash discount if payment was made on 29TH October 2009. Calculate the amount paid if payment was made on 26th October 2009.
Date posted:
September 2, 2019
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Mention four factors that may have caused the Demand curve to shift to the right.
Date posted:
September 2, 2019
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The table below shows monthly income tax rates.
Mrs. Wanjala earns a monthly salary of Ksh.15,000 and a taxable travel allowance of Ksh. 5,000 per month. She is also provided with a house by the institution for which she pays a nominal rent of Ksh.1000 per month.
(a) Calculate the employees taxable income every month.
(b) Calculate the employees monthly total tax payable
(c) If the employee is entitled to a personal relief of Ksh.900 per month and a non taxable medical
allowance of Ksh.2,000. Calculate her net monthly income.
Date posted:
September 2, 2019
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The following trial balance was extracted from the ledgers of Baraka Traders for the year ended 31st December 2015.
On 31st December 2015, the business had closing stock valued at Shs. 60,000.
Required:
(i) The Trading, Profit and Loss Account for the year ended 31st December 2015.
(ii) A Balance Sheet as at that date.
Date posted:
September 2, 2019
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Record the following transactions in Akili Traders‘ Three-Column Cashbook and balance it off on 31st January 2015.
Jan 1 Balance b/d Cash Kshs. 200,000 Dr.
Bank – Kshs. 15,000Cr
Jan 2 Cash sales Kshs. 145,000
Jan 6 Paid for motor expenses Kshs. 2,000
Jan 7 Paid salaries in cash Kshs. 50,000
Jan 9 Bought stationeries in cash Kshs. 1,000
Jan 14 Settled Kalyet‘s account of Kshs. 60,000 by cheque less 3% cash discount.
Jan 18 Received a cheque of 84,600 from Koech after deducting 10% cash discount.
Jan 21 Cash sales paid direct into the bank 340,000
Jan 23 Kaigat settled his account of 2,600 by cheque after deducting 5% cash discount.
Jan 24 Received cheque from the following debtors after deducting 10% discount in each case;
Chuma Kshs, 3,000, Buko 28,000 and Matapei 9,000
Jan 25 Paid consultancy salaries in cash Shs. 2,000
Jan 29 Credit purchase of Shs. 10,000
Jan 31 Banked all except 4,200
Date posted:
September 2, 2019
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A solid is partly a cone and partly a hemisphere. The radius of the hemisphere is 5cm. the height of the solid is 17cm. Determine:
(a) The volume of the cone.
(b) The volume of the hemispherical part.
(c) The volume of the solid.
(d) The curved surface area of the cone.
(e) The curved surface area of the hemisphere.
(f) The total surface area of the solid.
Date posted:
September 2, 2019
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Outline four challenges that a distributor of fresh milk is likely to face in his / her operations.
Date posted:
September 2, 2019
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Highlight four ways in which HIV/AIDS prevalence has negatively affected business activities.
Date posted:
September 2, 2019
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The diagram below shows a histogram representing marks obtained in a certain test. Develop a frequency distribution table.
Date posted:
September 2, 2019
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The figure below is a cut out net of a wedge. Find its volume.
Date posted:
September 2, 2019
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Two beakers of exactly similar shape can hold 250ml and 200ml of liquid respectively. If the surface area of the larger beaker is 400cm2, calculate the surface area of the smaller one.
Date posted:
September 2, 2019
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Outline four role of the mass media in promoting consumer protection
Date posted:
September 2, 2019