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# A

Questions8
• ### What factors affect the heat of combustion of a substance?

Why do some alcohols release more heat energy when combusted than others?

• ### What is the best material to use for insulating a calorimetry experiment?

I am doing an experiment with a spirit burner underneath a test tube and measuring the temperature change of the water and mass change of the burner to calculate the energy released. What would be a good material to place around the setup to reduce the heat loss from the spirit burner to the environment? Could you please discuss in relation to conductors vs insulators, specific heat capacity, heat conductivity?

Thank you for your help :)

• ### How to find angle ABC?

Required to find angle ABC. Been learning about circle theorems.

• ### How does using only one source for your data affect the reliability?

- You won't know if the data is different from other sources.

• ### Theoretical vs Experimental Probability?

Because probability is a ratio, increasing the sample size doesn't affect the theoretical probability. Can the same thing be expected for experimental probability?

• ### Rate of diffusion / surface area to volume ratio?

Does volume affect the rate of diffusion when it increases in the same ratio with surface area?

This is possible because cells can take on different shapes to maximize surface area.

• ### Why are these two values the same?

Why do we change tan 30 = 1/sqrt3 to sqrt3/3 ?

Why can't I leave tan 30 as 1/sqrt3

This is for a right angled triangle with a hypotenuse of 2.

Thanks (in advance) for the help.

• ### Exact values/special triangles?

How do I prove that the two values that need to be added to find AB are sqrt3/2 and 1/2?

Thanks (in advance) for the help.