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In a science experiment a substance is decaying exponentially. Its mass, M grams, at time t minutes is given by M=300e^(-0.05t). Find the time taken for the mass to decrease to half of its original value.

Firstly, calculate the initial value of of M, by substituting t = 0 into the equation M=300e -0.05t Initially, M 0 = 300e 0 =300 x 1 = 300When the substance mass has decreased to half its initial value, M = ...
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Answered by Bony R. • Maths tutor
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Calculate the mass of copper oxide required to produce 24.95 g of copper sulfate crystals (CuSO4.5H2O).

Given the equation for the reaction:CuO(s) + H2SO4(aq)-------> CuSO4(aq) + H2O(l) and the relative formula mass of the copper sulfate crystals Mr=249.5 and the relative atomic masses of O=16 and Cu=63.5Fr...
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Answered by Jessica H. • Chemistry tutor
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What is the difference between meiosis and mitosis

Mitosis is the asexual reproduction/division of cells in a single organism which is used all over the organism. The result of mitosis is genetically identical cells and this is used for growth and repair. A ...
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Answered by Nicholas W. • Biology tutor
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How do you divide fractions and mixed numbers

If the question is as such: 3/4 divided by 2/3 you simply reverse the second fraction (making it 3/2) and now multiply the two together. For example, it should now read 3/4 x 3/2 = 9/8. This can then by put ...
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Answered by Nicholas W. • Maths tutor
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Define Osmosis

The net movement of water from a place of high concentration to low concentration through a semi-permeable membrane.
Answered by • Biology tutor
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