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- Study the section of the polymer below and answer the questions that follow.(Solved)
Study the section of the polymer below and answer the question that follow.
Name the polymer
Date posted: September 9, 2019.
- Sketch a block and tackle pulley with three movable pulleys in the lower block and two fixed pulleys in the upper block,to give a velocity...(Solved)
Sketch a block and tackle pulley with three movable pulleys in the lower block and two fixed pulleys in the upper block,to give a velocity ratio of 6.
Find:
(i) An effort of 450N is used to raise a load of 2700N. Determine:
- Mechanical advantage (M.A)
- Efficiency of the pulley system.
(ii) If all the wasted energy is used to raise the lower block and the frictional force between pulleys and moving parts is 3.6N; determine the weight of the lower block.
(iii) If the load moved through a distance of 50cm, determine the useful work done by the effort.
Date posted: September 9, 2019.
- An element O has two isotopes..(Solved)
An element O has two isotopes
containing 90% and Isotope
Find the R.A.M of O.
Date posted: September 9, 2019.
- The following equation involve hydrochloric acid.
MnO2(s) + 4HCl(aq)------>MnCl2(aq) + 2H2O(l) + Cl2(g)
State the type of reaction taking place in the reaction.
(Solved)
The following equation involve hydrochloric acid.
MnO2(s) + 4HCl(aq)------>MnCl2(aq) + 2H2O(l) + Cl2(g)
State the type of reaction taking place in the reaction.
Date posted: September 9, 2019.
- Study the following part of the solvay process for the manufacture of sodium carbonate and answer the questions that follow:(Solved)
Study the following part of the solvay process for the manufacture of sodium carbonate and answer the questions that follow:
(i) State the main source of Carbon (IV) oxide in the process.
(ii) Write down the overall equation for the reaction in chamber I.
(iii) Name process in step 1.
Date posted: September 9, 2019.
- The figure below shows a cuboid in two positions. Explain how the stability of the cuboid changes when it is changed from position a to...(Solved)
The figure below shows a cuboid in two positions. Explain how the stability of the cuboid changes when it is changed from position a to b.
![pic9920191157.png](/questions/uploads/pic9920191157.png)
Date posted: September 9, 2019.
- The spiral springs shown in the figure below are identical. Each spring has a spring constant K = 200 N/m. Each rod weighs 0.1 N...(Solved)
The spiral springs shown in the figure below are identical. Each spring has a spring constant K = 200 N/m. Each rod weighs 0.1 N and each spring weigh 0.1 N. Determine the total extension caused by the 150 N weight.
![pic9920191150.png](/questions/uploads/pic9920191150.png)
Date posted: September 9, 2019.
- What is the atomic number and mass number T?(Solved)
A radioactive isotope T decays by emitting three alpha particles to form
.
What is the atomic number and mass number T?
Atomic number -
Mass number -
Date posted: September 9, 2019.
- A balloon with argon gas of volume 199cm3 at the earth‘s surface where the temperature is 210C, and the pressure 760mm of mercury. If it...(Solved)
A balloon with argon gas of volume 199cm3 at the earth‘s surface where the temperature is 210C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 20C and the pressure 100mm of mercury, calculate the volume of the balloon.
Date posted: September 9, 2019.
- In a faulty mercury-in-glass thermometer it was found that the mercury level stands at 2 cm mark in the tube at 00C and 20cm when...(Solved)
In a faulty mercury-in-glass thermometer it was found that the mercury level stands at 2 cm mark in the tube at 00C and 20cm when in steam above boiling point of water at normal atmospheric pressure. Calculate the temperature when the mercury stands at 13cm mark.
Date posted: September 9, 2019.
- A man whose mass is 80kg stands on weighing machine. When the lift ascends with an acceleration of 2.45m/s2, what is the reading on the...(Solved)
A man whose mass is 80kg stands on weighing machine. When the lift ascends with an acceleration of 2.45m/s2, what is the reading on the scale?
Date posted: September 9, 2019.
- Give the name of the following ion [Zn(NH3)4]2+(Solved)
Give the name of the following ion [Zn(NH3)4]2+
Date posted: September 9, 2019.
- Write ionic equations to show how excess sodium hydroxide added to a solution containing Al3+ ions reacts.(Solved)
Write ionic equations to show how excess sodium hydroxide added to a solution containing Al3+ ions reacts.
Date posted: September 9, 2019.
- A micrometer screw gauge which had an error of +0.02mm was used to measure the diameter of a spherical marble. If the actual diameter was...(Solved)
A micrometer screw gauge which had an error of +0.02mm was used to measure the diameter of a spherical marble. If the actual diameter was 3.67mm, draw a micrometer screw gauge showing its reading.
Date posted: September 9, 2019.
- State the name of the instrument used to take the following readings;
(i) 10 kg
(ii) 0.00245m(Solved)
State the name of the instrument used to take the following readings;
(i) 10 kg
(ii) 0.00245m
Date posted: September 9, 2019.
- The figure below shows a pair of parallel plates of capacitors connected to a battery. The upper plate is displaced slightly to the left.(Solved)
The figure below shows a pair of parallel plates of capacitors connected to a battery. The upper plate is displaced slightly to the left.
Suggest two adjustments that can be made so as to reduce the effective capacitance.
Date posted: September 9, 2019.
- Elements P and Q have the following atomic numbers 19 and 8 respectively.
Using dot and cross draw a diagram to show how the elements form...(Solved)
Elements P and Q have the following atomic numbers 19 and 8 respectively.
Using dot and cross draw a diagram to show how the elements form bonds.
Date posted: September 9, 2019.
- Given elements A, B and C with atomic numbers 11, 19 and 13 respectively.
(a) Compare the atomic radius of A and C. Explain.
(b) Compare...(Solved)
Given elements A, B and C with atomic numbers 11, 19 and 13 respectively.
(a) Compare the atomic radius of A and C. Explain.
(b) Compare reactivity of A and B.
Date posted: September 9, 2019.
- Haber process (the manufacture of ammonia gas) is given by the following equation.(Solved)
Haber process (the manufacture of ammonia gas) is given by the following equation.
State and explain the effect of:
(a) Introducing some drops of water to the equilibrium.
(b) Pumping nitrogen gas to the equilibrium mixture.
(c) Lowering the temperature of the reaction.
Date posted: September 9, 2019.
- Four capacitors were connected in a circuit as shown in the figure below. The switch is then closed.(Solved)
Four capacitors were connected in a circuit as shown in the figure below. The switch is then closed.
Determine ;
(i) The effective capacitance
(ii) The total charge
(iii) The energy stored in the combination when the switch is closed.
Date posted: September 9, 2019.
- Using oxidation numbers, determine from the equation below the species which undergoes oxidation and reduction.
2FeCl2(aq) + Cl2(g)----->2Fe Cl3(aq)
Oxidation -
Reduction -(Solved)
Using oxidation numbers, determine from the equation below the species which undergoes oxidation and reduction.
2FeCl2(aq) + Cl2(g)----->2Fe Cl3(aq)
Oxidation -
Reduction -
Date posted: September 9, 2019.
- In an experiment to determine the focal length of a converging lens several values of image distance and the corresponding magnification were obtained. A graph...(Solved)
In an experiment to determine the focal length of a converging lens several values of image distance and the corresponding magnification were obtained. A graph of magnification m against image distance (V) was plotted as shown below.
From the graph determine the focal length of the converging lens.
Date posted: September 9, 2019.
- Calculate the oxidation state of chromium in the ion Cr2 O2-(Solved)
Calculate the oxidation state of chromium in the ion Cr2 O2-
Date posted: September 9, 2019.
- The figure below represents a pinhole camera.Sketch rays to show the formation of an enlarged image in the camera. Label both the image and the...(Solved)
The figure below represents a pinhole camera.Sketch rays to show the formation of an enlarged image in the camera. Label both the image and the object.
![pic9920191041.png](/questions/uploads/pic9920191041.png)
Date posted: September 9, 2019.
- Gas Q with a relative molecular mass of 48 took 50 seconds to diffuse through a porous diaphragm. How long will it take for the...(Solved)
Gas Q with a relative molecular mass of 48 took 50 seconds to diffuse through a porous diaphragm. How long will it take for the same amount of hydrogen Chloride (HCl) to diffuse through the same diaphragm under similar conditions? (H = 1.0, Cl = 35.5).
Date posted: September 9, 2019.
- Draw a well labeled diagram showing how blister copper is purified.(Solved)
Draw a well labeled diagram showing how blister copper is purified.
Date posted: September 9, 2019.
- The molar heat of fusion of ice at O0C is 6kJ mol-1. Calculate the heat change when 36g of ice is converted to 36g of...(Solved)
The molar heat of fusion of ice at O0C is 6kJ mol-1. Calculate the heat change when 36g of ice is converted to 36g of water at 1O0C. (SHC = 4.2-1g K-1, density = 1.0g/cm3, H = 1.0, O = 16.0)
Date posted: September 9, 2019.
- The figure below shows a bar magnet. Point A and B are in front of the magnet.On the axis provided, sketch a graph showing how...(Solved)
The figure below shows a bar magnet. Point A and B are in front of the magnet.
On the axis provided, sketch a graph showing how the magnetic field strength changes from A to B.
Date posted: September 9, 2019.
- Name the following organic compounds.(Solved)
I.Name the following organic compounds.
(a)
(b) HOCH2 - CHOH - CH2OH
II.Given:
![Q89920191015.png](/questions/uploads/Q89920191015.png)
Date posted: September 9, 2019.
- A pendulum bob is whirled with uniform speed in a horizontal circle of radius 20cm.The bob describes an arc of length 5cm within 15 seconds.Calculate
i)...(Solved)
A pendulum bob is whirled with uniform speed in a horizontal circle of radius 20cm.The bob describes an arc of length 5cm within 15 seconds.Calculate
i) Angular velocity
ii) The uniform speed of the bob along the circular path
iii) The frequency with the bob moves along the circular path
iv) State why the bob is accelerating yet it moves with the uniform speed along its path
Date posted: September 9, 2019.