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An alcohol, X has an Mr of 74 and percentage composition of 64.9% Carbon, 13.5% Hydrogen and 21.6% Oxygen. It does not turn potassium dichromate (VI) green. Determine the structural formula of X, and state its name.

64.9/12 = 5.40833 21.6/16 = 1.35 5.40833/1.35 = 4 so 4 Carbons 13.5/1.35 = 10 so 10 Hydrogens 1.35/1.35 = 1 so 1 Oxygen 4x12+10+16 = 74 so emperical formula = Molecular formula it is a tertiary alcohol becau...
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Answered by Megan B. • Chemistry tutor
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A hollow sphere of radius r is being filled with water. The surface area of a hemisphere is 3pi*r^2. Question: When the water is at height r, and filling at a rate of 4cm^3s^-1, what is dS/dT?

By the chain rule ds/dt = ds/dr * dr/dv * dv/t. At a height of r, the water fills a hemisphere. So ds/dr = 6pi r. dr/dv = 1/(dv/dr), so we need to find dv/dr. Students should have the formula for the volume ...
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Answered by Henry B. • Maths tutor
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Describe in Italian what you like to do in your spare time

Nel tempo libero mi piace andare a correre, fare delle lunghe passeggiate in montagna e leggere. Di solito vado a correre due volte alla settimana, mi aiuta a rilassarmi e a mantenermi in forma. Nel fine set...
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Answered by Paolo C. • Italian tutor
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Suppose we have a circle whose radius is 5cm. If a sector of this circle has an area of 15 cm^2, what is the size its angle (in degrees)?

Firstly, you would need to figure out what formula you can use to solve this problem. You know the radius and area of the sector, and you need to find the angle. So, the correct equation to use would be the ...
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Answered by Roxani S. • Maths tutor
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Describe and evaluate Selye's General Adaptation Syndrome (GAS) model.

Selye’s General Adaptation Syndrome (GAS) states that prolonged chronic exposure to stress can be harmful to an individual and suggest that individuals go through three physiological stages: alarm, resistanc...
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Answered by Renae W. • Psychology tutor
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