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What does the half life of radioactive substance mean?

All radio active decay is random. In any radioactive substance each specific nucleus has a chance of decaying at one specific point in time. However we can't predict when this is going to happen. Instead we ...
Answered by • Physics tutor
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What is the law of demand?

The law of demand states that quantity purchased varies inversely with price. In other words, the higher the price, the lower the quantity demanded and vice versa. This occurs because of diminishing marginal...
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Answered by Hari M. • Economics tutor
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NaOH has a high melting point and conducts electricity in solution. H2O has a low melting point and does not conduct electricity. Explain, using the structure of each, why this is the case.

NaOH is an ionic compound with strong electrostatic attraction between the oppositely charged ions . This means the melting point is high, as the bonds need a lot of energy to overcome. When dissolved, the i...
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Answered by Sophie T. • Chemistry tutor
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solve two variables quadratic equation system 2x-y=1 10x^2-y^2-x+1=0

To solve the equation, we need to try to make the second equation all in x first.From the first equation 2x-y=1,we could rewrite it into y=2x-1,Then we put y=2x-1 into the quadratic equation 10x 2 -y 2 -x+1=...
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Answered by KEYU M. • Maths tutor
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Form the equation for the complete burning of C3H8

Firstly, note that the reaction is complete burning. This means there is no carbon monoxide produce, only carbon dioxide.Secondly, we should know that all simple combustion reactions produce water .So, we kn...
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Answered by Edward R. • Chemistry tutor
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