Saturday
April 19, 2014

Posts by Gift


Total # Posts: 43

science
an you please solve the questions for me 1. 3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units i...

science
3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units in air, water, sediment and fish in equilibri...

university of calabar
A stoppered flask at 25 0C contains 250 ml water, 200 ml octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene are measured in the water. What is the ...

science
a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

physics
a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

physics
a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

life orientation
provide recommendation on how to address poverty?

life orientation
identify one enviromental or human factor that causes ill health, accident crises, and disaster within your community

Life orientation
Idemtify 3 enviromental health hazards that causes ill health,accidents,crises and disaster within a community in South Africa and globally.include evidence that is current of the identified issues

Science
A car is moving at a constant velocity when it is involved in a collision.the car comes to rest after 0.45sec with an average acceleration of 65,0 m/s2 in the direction opposite that of the car's velocity. What was the speed ,in km/h, of the car before the collision?

Mpumulana
Why do some criminals use facebook as a tool to achieve their goal

statistics
The time required by workers to complete an assembly job has a mean of 50 minutes and a standard deviation of 8 minutes. To spot check the workers' progress on a particular day, their supervisor intends to record the times 60 workers take to complete one assembly job apiec...

Physics
Can someone help plz

Physics
Malaan is travelling from Makhado to Polokwane by taxi at a speed of 120km/h.A Nissan bakkie passes the taxi while it is on its way to Polokwane and is moving at 150km/h. a) Determine Malaan's velocity with respect to the Nissan bakkie b) what is the taxi 's velocity w...

Chemistry
Skeletal structural formulas of pentane,2 methyl butane and 2,2 dimethyl propane

Chemistry
Write down (a) condensed and (b) skeletal structural formulas for isomers of an organic substance whose chemical formula has 5 carbon atoms and 12 hydrogen atoms and (c) provide the common name for each of the isomers

Chemistry
1)Define the term'geometric isomers' 2)Give geometric isomers and corresponding names for the following condensed structural formula: CH3CH2(CH)2CH3

Chemistry
Define the terms 'weak acid' and 'catenation'

Chemistry
Thanx a lot GOD BLESS YOU

Chemistry
Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka=1.75*10^-5

Prcts chemistry
Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka = 1.75*10^-5

Chemistry practice
Glycine is the amino acid used to make proteins a)for each mole of glycine that burns,973.49k/mol of which is libarated eqution and the values of delta Hf^o for the products of combustion to calculate the enthalpy of formation for glycine.Represent your working on the energy d...

Chemistry
Calculate the enthalpy of combustion of acetylene(per mol acetylene) using bond enthalpies and energy diagram

Chemistry
Calculate the enthalpy of combustion of acetylene(per mol acetylene)using bond enthalpies and energy diagram

Chemistry practice
Using the form of energy diagram,make a concept map of the two different methods of calculation of reaction enthalpy(via the bond enthalpy and via the enthalpy of formation)

Chemistry practice
Calculate using the enthaly of formation,the enthalpy of combustion of methanol,CH3OH

physics
What is the boiling and freezing points of celsius scale and kelvin

physics
Heat is moving inward

physics
Wrap a cotton wool around a thermometre,will its temperature rise? Explain your answer please

physics
A piece of metal has a density of 0.20g/cm^3.what is the volume in cm^3 of a 1g sample of a substance?

physics
a)Hydrogen has a much higher specific heat capacity than milk. What can you say about the specific heat capacity of hydrogen?b)wrap a cotton wool around a thermometer,will its temperature rise?Explain your answer c)if you are holding a metal nail with one of its end against a ...

physics
When water falls from the top of the waterfall,at the victoria falls in zimbabwe,the temperature of the water at the top is less than the temperature at the bottom.If 180.5g of water falls a distance of 125.0m, calculate the increase in temperature of the water ,when it reache...

Chemistry
Xenon is one of the noble gases, and is generally quite unreactive.in fact,it was long believed that all the noble gases were totally unable to form compounds.It came as quite a surprise,therefore,when it was discovered that some of its compounds could be made.A chemical formu...

Chemistry
Standard enthapies of formation are not always like bond enthalpies.Explain

Chemistry
Use the bond enthalpies and bond energies from the data book in themochemical equations to calculate the reaction enthalpy of:H2(g) + Br2(g) ->2HBr(g) and show your workings in the question above in an energy level diagram.please..

chemistry
Use the bond enthalpies and bond energies in the data book in themochemical equations to calculate the reaction enthalpy of: H2(g) +Br2(g) -> 2HBr(g)

chemistry
By using the bond enthalpies and bond energies in thermochemical equations to calculate the reaction enthalpy of; H + Br=2HBr

chemistry
State whether each of the following will increase,decrease or unchange when catalyst is added to the reaction and give an explanation for your answer please a) rate of reaction b)activation energy c)reaction enthalpy d)equilibrium of reaction

life oriantation
5 ways in which the human or enviromental problem impacts on the community

Life orientation
In 10-15 line critically discuss 5 ways in which the environment problem impect on the community

Life orientation
provide recommendation

physics
I really need the answer for this question please.

Physics
Hydrogen has a much higher specific heat capacity than milk.what can you say about the specific heat capacity of hydrogen?

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