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a. A sample of ethanol vapour in air has a concentration of 20% (v/v). Explain whether such a mixture will combust in the presence of an ignition source at room temperature? b. Write a balance equation for the complete combustion of ethanol in the air c. The molar enthalpy of combustion is...

A set of 12 identical metal ballbearings was made from 10cm^3 of metal, Calculate the radius of each ballbearing How do i do this Question???

Why is polypropylene is a thermoplastic? please explain

The volume of this cylinder is 330cm^3 What are the dimensions of the cylinder, answer in 2 d.p.

how to do this question??? A square pyramid has a volume of 90cm^3. its height is 7.5cm. calculate the area of its square base. V=1/3 x A x h

i do not understand this question i got from school, "Give two reasons for finding a substitute of ivory"

How do i answer this question, Describe what organisational tools have been used to make the information on each site accessible to the user.And what is Visual hierarchiical, linear, non-linear or combination navigation???Plz explain so i can answer my question to my web evaluation!!!

How do i do this question. Suggest how the following compounds could be prepared 1. 2-butanol 2. 2,3-dichloropentane 3. 3-bromohexane

ok two more questions i not sure, same question, Write a balanced equation for the following reactions, draw the structural formulae and give the name of the product. 1. 2-butene with H2 (with Ni catalyst) 2. ethene with HCL

ok i got these two questions i don't really know how to answer. Write a balanced equation for the following reactions, draw the structural formulae and give the name of the product. 1. propene with H2O (with H2SO4 catalyst) 2. 3-hexene with bromine water

Two blocks, P and Q, of mases 4kg and 8 kg respectively are connected by a light inetensible string and hung over a frictionless pulley as shown in the following diagram a. If the two blocks are allowed to move freely, calculate the resultant accerlation of the 8kg mass b. Calculate the...

A car travelling along a straight road at 25ms^-1 is acted upon a constant force acting in the direction of motion which speeds it up to 50ms^-1 in 10 s a. Calculate the magnitude of the car's average acceleration while force is acting. b. Calculate the magnitude of the car's displacement car...

ok i am struggling on this question, Q. if y=x^4 - 2x^3 + 5, find dy/dx when x=-2 so far i got to: f(x) = 4x^3 f(-2) = -32 what do i do next???

Determine the empirical formula of magnesium oxide??? Mass of dry crucible + Lid = 32.14g Mass of dry crucible + Lid + Magnesium = 32.63g Mass of dry crucible + Lid + Magnesium oxide = 32.95g Show working

What constitutes the solar wind?

Investigate power circuits for different types of household appliances and explain why different circuits are required for light and power. Can u give me links to websites that may answer my question.

What are the two Phenomena that vary with the solar cycle?

What constitutes the solar wind, plz explain...

what is the circuit symbol for thermostat???

what is the circuit symbol for a fan???