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- The electronic configuration of an ion P2- is 2.8.8..
Draw the structure of the atom just above element P in the periodic table.(Solved)
The electronic configuration of an ion P2- is 2.8.8..
Draw the structure of the atom just above element P in the periodic table.
Date posted: September 17, 2019.
- The atomic numbers of Li and K are 3 and 19 respectively.(Solved)
The atomic numbers of Li and K are 3 and 19 respectively.
![above.png](/questions/uploads/above.png)
Date posted: September 17, 2019.
- Given that OA=6p – 4q, OB = 20 – 14q and AB = m(2p + 5q), Find the value of m.(Solved)
Given that OA=6p – 4q, OB = 20 – 14q and AB = m(2p + 5q), Find the value of m.
Date posted: September 17, 2019.
- Red blood cells from a rabbit were placed in a petri dish containing a certain solution. A drop from the petri dish was then mounted...(Solved)
Red blood cells from a rabbit were placed in a petri dish containing a certain solution. A drop from the petri dish was then mounted on a slide and observed under a light microscope after 20 minutes.He made the drawings below.
a) Name solution Y
b) What term is to is describe the process that took place.
Date posted: September 17, 2019.
- Study the following exothermic reactions involving enthalpy of neutralization.(Solved)
Study the following exothermic reactions involving enthalpy of neutralization.
Date posted: September 17, 2019.
- Use a calculator to evaluate and give the answer correct to 5 significant figures. (Solved)
Use a calculator to evaluate
and give the answer correct to 5 significant figures.
Date posted: September 17, 2019.
- What is the process that leads to addition or loss of one or more chromosomes?(Solved)
What is the process that leads to addition or loss of one or more chromosomes?
Date posted: September 17, 2019.
- Urea (NH2)2CO is prepared by the reaction between ammonia and carbon (IV) oxide gas.
2NH3 (g) + CO2 (g)----->(NH2)2 CO (aq) + H2O (l)
In one process,...(Solved)
Urea (NH2)2CO is prepared by the reaction between ammonia and carbon (IV) oxide gas.
2NH3 (g) + CO2 (g)----->(NH2)2 CO (aq) + H2O (l)
In one process, 620kg of ammonia were reacted with excess carbon (IV) oxide gas.
Calculate the mass of the urea that was formed.
(H = 1.0, C =12.0, N = 14,O = 16 and RMM of ammonia is 17 )
Date posted: September 17, 2019.
- During a field study, a student at Muringa secondary school collected a certain organisms whose actual length was four centimeters. He made a drawing of...(Solved)
During a field study, a student at Muringa secondary school collected a certain organisms whose actual length was four centimeters. He made a drawing of the organism whose length was 12cm. Calculate the magnification of the drawing.
Date posted: September 17, 2019.
- Compute the molar heat of combustion of butane, given that(Solved)
Given that
![butane.png](/questions/uploads/butane.png)
Date posted: September 17, 2019.
- State the roles of paired fins in a bony fish.(Solved)
State the roles of paired fins in a bony fish.
Date posted: September 17, 2019.
- Given the equation y = x2 – 5x +6
a)In the space provided below sketch the graph of the equation y = x2 – 5x +6
b)Write...(Solved)
Given the equation y = x2 – 5x +6
a)In the space provided below sketch the graph of the equation y = x2 – 5x +6
b)Write down the co – ordinates of the Y intercept and X intercept
c)Calculate the area grounded by the curve y = x2 – 5x +6 and the lines x = 0
and x= 4
Date posted: September 17, 2019.
- The table below gives some bond energies of some bonds.(Solved)
The table below gives some bond energies of some bonds.
Calculate the enthalpy changes for the reaction.
Date posted: September 17, 2019.
- Identify the type of immunity given When a young child suffers from measles and recovers from it.(Solved)
Identify the type of immunity given When a young child suffers from measles and recovers from it.
Date posted: September 17, 2019.
- Identify the type of immunity given When a baby obtains antibodies through breastfeeding.(Solved)
Identify the type of immunity given When a baby obtains antibodies through breastfeeding.
Date posted: September 17, 2019.
- Study the information in the table below and answer the questions that follow.(Solved)
Study the information in the table below and answer the questions that follow.
Calculate the enthalpy change of the reaction:
![Q2491720191028.png](/questions/uploads/Q2491720191028.png)
Date posted: September 17, 2019.
- The frequency distribution of marks of 120 students is given in the table below
Draw an Ogive curve
(Solved)
The frequency distribution of marks of 120 students is given in the table below
Draw an Ogive curve
Date posted: September 17, 2019.
- State the difference between a cell wall and a cell membrane.(Solved)
State the difference between a cell wall and a cell membrane.
Date posted: September 17, 2019.
- Study the diagram below and answer the questions that follow.(Solved)
Study the diagram below and answer the questions that follow.
a) Identify the apparatus.
b) State the functions of the part labeled x.
Date posted: September 17, 2019.
- The table below shows corresponding values of X and Y which are believed to be connected by a relation of the form Y = abx...(Solved)
The table below shows corresponding values of X and Y which are believed to be connected by a relation of the form Y = abx – 10 where a and b are constants.
By drawing an appropriate straight line graph on the grid provided
(i) Find the approximate numerical values of a and b
(ii) Hence establish the particular mathematical equation connecting the variables X and Y
b)By using the equation find the value of Y when X = 4.5 to the nearest Unit
Date posted: September 17, 2019.
- Study the diagram below and answer the questions that follow.(Solved)
Study the diagram below and answer the questions that follow.
i. State two observations made in the tube A
ii. Explain why the sand is heated first before heating the zinc metal
iii. Give the chemical test of gas X.
Date posted: September 17, 2019.
- The diagram below represents a certain stage in cell division.(Solved)
The diagram below represents a certain stage in cell division.
a) i) Identify the type of cell division.
ii) Give reasons for your answer in a(i) above.
b) State the stage of cell division shown in the diagram above.
Date posted: September 17, 2019.
- The figure below represents a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual...(Solved)
The figure below represents a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of elements.
a) i).What chemical family does element J belong to?
ii. Compare the reactivity of element C and H. Explain.
b)
i) Write the chemical formula of the chloride of element D
ii) Name the type of structure of the chloride in b(i) above.
c). State and explain the difference in atomic radius and ionic radius of element F
d). Using dots (.) and crosses (x) show how bonding occurs when element E and F react.
Date posted: September 17, 2019.
- At 200C NO2 ; N2O4 gases exist in equilibrium as shown in the equation below.(Solved)
At 200C NO2 ; N2O4 gases exist in equilibrium as shown in the equation below.
(a) What is the significance of the negative sign as in the equation above.
(b) State and explain the observations that would be made when
(i) A syringe containing the mixture was immersed in warm water.
(ii) The volume of the gaseous mixture in the syringe was increased.
Date posted: September 17, 2019.
- Name the plant hormone that is involved in topic responses.(Solved)
Name the plant hormone that is involved in topic responses.
Date posted: September 17, 2019.
- A city x is at (70°S, 90°E) and another city Y is at (70°S, 90° W)
a)Find the distance in nm from city X to City...(Solved)
A city x is at (70°S, 90°E) and another city Y is at (70°S, 90° W)
a)Find the distance in nm from city X to City Y:
i)Along a greet circle
ii) Along a parallel of latitude answer t (4.s .f)
b)A plane left town X speeding west at speed of 400knots
i)How long did it take to reach town Y (Give answer in hours and nearest minutes
ii)If the plane left city X at 8.30 A.M Monday local time, at what time did it reach city Y?
Date posted: September 17, 2019.
- Which field of biology deals with the Study of interrelationship of living things in their surroundings.(Solved)
Which field of biology deals with the Study of interrelationship of living things in their surroundings.
Date posted: September 17, 2019.
- The equation below represents a certain biological process.(Solved)
The equation below represents a certain biological process.
a) Name the process Q
b) Identify substance R
Date posted: September 17, 2019.
- The flow chart below and answer the questions that follow.(Solved)
The flow chart below and answer the questions that follow.
i). Identify the following;
Gas R
Solid M
Gas J
Liquid S
ii. Write a chemical equation for the formation of gas T
iii. Name catalyst K
iv) State two uses of liquid S
Date posted: September 17, 2019.
- In a triangle below AOB, OA = a, OB = b, M is the midpoint of AB and N is a point on OB such...(Solved)
In a triangle below AOB, OA = a, OB = b, M is the midpoint of AB and N is a point on OB such that ON: NB = 1:2 AN and OM intersect at P
a) Express the following vectors in terms of a and b
AB
OM
AN
If OP = SOM express OP in terms of t, a and b
b) If AP = tAN express
AP in terms of t , a and b
c)Hence express OP in terms of t, a and b
d)Using the results above solve for s and t
Date posted: September 17, 2019.