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Objective
To determine whether the installation of deep tube wells to reduce exposure to groundwater arsenic in rural Bangladesh had an effect on the incidence of childhood diarrhoeal disease.
Methods
Episodes of diarrhoeal disease in children aged under 5 years that occurred on one specified day each month between 2005 and 2006 were reported to community health workers for six rural villages. A geographical information system containing details of household water use and sanitation in the villages was built using data obtained by a global positioning system survey. The information system also included health, spatial and demographic data. A field survey was carried out to determine whether households obtained drinking water from deep tube wells installed in 2005. The effect of deep tube well use on the incidence of childhood diarrhoea was ASSESSED using a random effects NEGATIVE binomial regression model.
Findings
The risk of childhood diarrhoea was 46% lower in the 179 households that USED a deep tube well than in the 364 that used a shallow tube well ( P = 0.032). Neither socioeconomic status, latrine density, population density nor study year had a significant influence on disease risk. The incidence of childhood diarrhoea declined dramatically between 2005 and 2006, irrespective of water source.

Iodine

Iodine is a CHEMICAL ELEMENT with symbol I and atomic number 53. The heaviest of the STABLE halogens, it EXISTS as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to FORM a violet gas.

Its BODY heat that body RADIATES make chocolate MELT when you KEEP it in UR pocket.

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The Clemmensen REDUCTION allows the deoxygenation of ALDEHYDES or ketones, ... of the corresponding alcohols to these same reaction CONDITIONS does not lead to alkanes.i HOPE it will you
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It is bcoz HOT SOLUTIONS dissolve more of salt, thus a hot SOLUTION of potassium nitrate has more salt DISSOLVED as compared to the solution at room temperature.

It will be 16 G at STP.

Molecular MASS of pyrophosphoric acid = 177.98 G/mol

mass of pyrophosphoric acid produced = 53.4 g

molar mass of phosphoric acid =  98 g/mol 

number of moles in 53.4 g of phosphoric acid = 53.4/ 177.98 = 0.3

 

From the above eqn.

1 mol of pyrophosphoric acid is produced by 2 mol of phosphoric acid

mass of 2 moles of phosphoric acid = 2 x 98 = 196 g

mass of phosphoric acid required for FORMATION of 1 mol of pyrophosphoric acid = 196 g 

mass of phosphoric acid required for formation of 0.3 mol of pyrophosphoric acid = 0.3 x 196 = 58.8 g 

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Here is the balanced CHEMICAL EQUATION taking place

K2Cr2O7 + 14HCL --------> 2KCl + 2CrCl​3 + 7H2O + 3Cl2

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There are FOUR TYPE of SOLID

Continuous sterilization is the rapid transfer of heat to medium through steam condensate without the use of a heat exchanger. Once the media is in a holding loop, steam is injected to the system via a nozzle. The medium stays in this loop for a PREDETERMINED holding time until the entire medium is sterile.

Continuous sterilization is the rapid transfer of heat to medium through steam condensate without the use of a heat exchanger. Once the media is in a holding loop, steam is injected to the system via a nozzle. The medium stays in this loop for a predetermined holding time until the entire medium is sterile. This is more efficient than batch sterilization because instead of expending energy to heat, hold, and cool the entire system, small portions of the inlet streams are heated at a time. By looping sterile media tubes (which are at higher temperatures) past inlet tubes, the difference in temperature is used to help heat the unsterile medium. So instead of having a cold-water stream cool the sterile media, the lower temperature unsterile media stream ABSORBS heat from the warm stream, cooling the sterile media. Finally, the sterile media is flash cooled through an expansion valve to adjust the temperature to meet process parameters.



Advantages:
Uniform steam requirements throughout the duration of the sterilization
Simplified process control
Shorter sterilization time means less thermal degradation of medium
Disadvantages:
High demand for steam in a shorter period of time than batch
Concentration of media becomes dilute due to steam condensation
Since steam is actually dispersed in media, steam must be clean to avoid contamination



Batch sterilization is the reduction of contaminant organisms through the heating of a vessel. The entire volume of media is sterilized at once through the use of thermal or radiation techniques. When running a thermal batch sterilization, a system goes through 3 STEPS: heating, holding, and cooling. Heating requires the addition of energy throughout the entire medium volume. This can be done by adding heat through a jacket on the vessel. The temperature is increased until it reaches the sterilization temperature where it is held for a set period of time. During this PHASE, most of the unwanted microorganisms are destroyed. Finally, the system is cooled to bring the sterile media back to the desired temperature. For radiation sterilization, the process is similar to above, although it uses radiation intensity instead of heat.


t = time
No = initial spore concentration
Nf = final spore concentration
Vo = initial batch volume
Vf = final batch volume
k = death rate constant
By the Arrhenius equation, the death kinetics are k = Ae-E/RT.

In order to sterilize a batch, calculate the total area underneath the curve. Therefore, model death using first order kinetics and integrate as seen above. This will yield a temperature and the corresponding duration of time needed to sterilize the media.

Advantages:
Most WIDELY used technique
Simple operation
No additional materials are added to the media itself
Disadvantages:
More expensive heat requirements than continuous sterilization
Best results occur in well-mixed closed vessels

In total, there are 55.55 moles of water in 1 L of water.

Here is how you CALCULATE it:

1 mol of water (H20) = 18 g
Mass of 1 L of water = 1000 g
How MANY times can you fit 18 g PACKETS (moles) into 1000 g?

1000g/18g = 55.55

Here it is - 1 L of water has 55.55 moles of water.

Forbidden ZONE is the ENERGY GAP. It is the gap between the valence BAND and CONDUCTION band in the band theory.

What is QUESTION ... .m

Because SODIUM metal is POSITIVE in character so it is attracted towards CATHODE

A drop of ink will spread faster a its particles are QUITE LOOSELY ATTACHED to each other as COMPARED to HONEY

A substance which is used in engine .
Types of LUBRICANTS __Oil , GREASE, penetrating lubricants , DRY lubricants .

2NaHCO3=Na2CO3+CO2+H2O

1 mole ammonia contains 3 MOLES of hydrogen atoms.
So 10 moles of ammonia will contain 30 moles of hydrogen atoms .
1 mole of sulphuric acid contains 2 moles of hydrogen atoms .
So 5 moles of sulphuric acid will contain 10 moles atoms.
Total NUMBER of moles of hydrogen atoms = 30+10 = 40 moles
2 moles of hydrogen atoms make 1 mole of hydrogen GAS
So 40 moles of hydrogen atoms will make 20 moles of hydrogen gas.
1 mole hydrogen gas contains 6.023*10^23 MOLECULES.
20 moles of hydrogen gas will contain 20*6.023*10^23 molecules
=120.46*10^23 molecules.

Answer:

Give THREE uses of polyester, and explain the reason for each use.

Being very strong and CREASE RESISTANT, polyester is used to make pants, shirts, SUITS and bed sheets.

Because of its water-resistant properties, it is used to make jackets and garments that are used in wet and DAMP environments.

Explanation:

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Here's ur ans.

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✡ This is double displacement reaction as the TWO compounds changed their IONS .


KCl + AgNO3 --- AgCl + KNO3

✨Hope it HELPS

Antoine-Laurent DE LAVOISIER is the ANSWER..................

A composition reaction produces a single substance from multiple reactants. Adecomposition reaction produces multiple products from a single reactant.Combustion reactions are the combination of some compound with oxygen to MAKE oxides of the other ELEMENTS as products (although nitrogen ATOMS react to make N 2).

ne NUCLEON (proton or neutron) WEIGHTS about 1.67E-24 g, so 3.32E-23g is good for (33.2 / 1.67) = 20 baryons.

Answer = 2 × 20 = 40 nucleons.

Potassium BROMIDE ---≥ potassium METAL+ BROMINE<BR> Kbr ----≥ K + Br

Mass PERCENTAGE of CARBON is 27.3%
Explanation: Let US consider we begin with ONE mole of Carbon dioxide molecules. One mole of Carbon Dioxide has one mole of carbon atoms in all and 2 MOLES of Oxygen atoms as the ratio of Carbon to Oxygen in carbon Dioxide is 1:2.

The EXTERNAL FORM, contours, or OUTLINE of someone or something.........

∵An element x form highest oxide of the formula XO₃.
∴ oxidation state of Oxygen will be lowest and we KNOW , lowest oxidation number of oxygen is -2 .

∴ oxidation number of X + 3 { -2 } = 0 [ because molecule is neutral so, SUM of oxidation of atoms = 0 ]
⇒ oxidation number of X = +6
e.g., highest oxidation number of X = +6
∵ group number = 10 + highest oxidation number [ this METHOD applied when oxidation number >3 ]
∴ group number = 10 + 6 = 16

Hence, ELEMENTS LIES in 16th group

There is one SECONDARY carbon which is at the middle and there are two secondary hydrogen atoms which are attached to middle secondary carbon atom i.E. - CH2.
# the carbon which is attached to other two carbon atoms is called secondary carbon atom. #
here in the FORMULA CH3-CH2-CH3 the middle carbon i.e.carbon of -CH2- is attached to adjacent two carbon atoms hence it is secondary carbon atom
# the hydrogen atoms attached to secondary carbon atom are called as secondary hydrogen atoms here only one secondary carbon atom is PRESENT to which only 2 hydrogen atoms are attached i. e. hydrogen attached to,,,,,,,,,,,,, -CH2- ............ hence there is 1 secondary carbon and 2 secondary hydrogen atoms

Hydrogen is made up of TWO latin word..
Hydro.... WATER
GENE....... Forming....

MEAN water producer......
So it is called hydrogen



Hope it will DEFINITELY help you
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4.89 is ANSWER I THINK behshsh

The ANSWER is 32.065. 1 GRAMS SULFUR is EQUAL to 0.031186652112896 mole.
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There are so MANY POLYESTER we can't SAY any FAMOUS polyester