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Explain why silicon dioxide has a higher melting point than sulphur trioxide

Strong covalent bonds present between atoms in silicon dioxide. VDW (Van Der Waals) between molecules in sulphur trioxide. Covalent bonds are stronger than VDW. Covalent bonds require more energy to be overc...
ZW
Answered by Zak W. • Chemistry tutor
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Describe the process of DNA replication.

An enzyme called DNA helices breaks the hydrogen bonds between the bases on two polynucleotide strands of DNA, forming two single strands. Each original strand acts as a template for a new strand. Complement...
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Answered by Zak W. • Biology tutor
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The width of a Rectangle is 4cm shorter than its length. the rectangle has an area of 32cm2. Calculate its perimeter?

x (x-4) = 32X^2-4x-32 = 0(x-8)(x+4) = 0 x=8perimeter =8+4+4+8 = 24cm.
DH
Answered by Daniel H. • Maths tutor
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Differentiante y = arctan(c)

y = arctan(x)tan(y) = xsec 2 (y) = dx/dyfrom cos 2 A + sin 2 A = 1, we know that 1 + tan 2 A = sec 2 A (divide by cos 2 A), so we substitute in1 + tan 2 (y) = dx/dyfrom the initial relationship,1 + x 2 = dx/...
SS
Answered by Savvas S. • Maths tutor
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Consider this passage: Homer, Odyssey 11.467-567

There are three important factors to consider in order to interpret passages such as this: context, content and significance.The first, context, involves considering who is speaking, what comes before the pa...
IB
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