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Chemistry
A Level

PharmaPlus, a drug developer, is required by law to carry out clinical trials on the novel drug ‘AccuPreasure’. AccuPreasure is to be marketed for control of high blood pressure. Give three questions that clinical trials are designed to answer.

Is the drug safe for human use?

Are there any side-effects? How significant are these?

What is the safe-dose? What is the maximum concentration of A...

Answered by Joseph M. Chemistry tutor
1914 Views

Phosphorus is burned in air at 500 ºC to produce gaseous phosphorus(V) oxide. 220 g of phosphorus was reacted with an excess of air. Calculate the volume, in m3, of gaseous phosphorus(V) oxide produced

Additional information given:

P4 (s) + 5O2  (g) = P4O10 (g)     Pressure = 101kPa     Temp = 500oC     gas constant R = 8.31JK-1mol...

Answered by Natalie B. Chemistry tutor
4143 Views

Why does ice float on water? Use the structure of different states of matter to support your answer.

In a liquid, the particles are very close together, but can move around each other. In a solid, the particles are packed together. Depending on the substance, the solid particles can either be very well-o...

Answered by Akash B. Chemistry tutor
7833 Views

Predict the relative boiling points of propanal, butane and prop-2-en-1-ol from the highest to the lowest boiling point

In prop-2-en-1-ol, the strongest intermolecular forces acting between the molecules are hydrogen bonds. In propanal, the strongest intermolecular forces acting between molecules would be permanent dipole-...

Answered by Rajan K. Chemistry tutor
29457 Views

Describe the effects of changing the temperature on a reaction using Le Chatelier's princriple

Temperature: Exothermic reaction= energy given out to surroundings. Endothermic reaction= energy taken in from surroundings.

If say a reaction runs at 300 degrees and we increase the temperature to...

Answered by Branislav V. Chemistry tutor
1910 Views

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