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Chemistry

KS3

CH3OH + 1.5O2 -> CO2 + 2H2O. Using the information from Table 10 of the Data Booklet, determine the theoretical enthalpy of combustion of methanol.

By definition, ΔH°_rxn = Σ ΔH°_f (products) − Σ ΔH°_f (reactants).The enthalpy of combustion is the same as the enthalpy of reaction in this case. From Table 10, we can get t...

Answered by Mark C. • Chemistry tutor

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Why can gases be compressed but liquids and solids can't?

The particles in a gas are widely spaced and move around freely. This means they will move to fit into any space but in liquids and gases the particles are more closely packed so cannot be compressed.

Answered by Christina P. • Chemistry tutor

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What is the difference in structure between graphite and graphene?

In graphite, carbon atoms are in layers which slide over each other. Whereas in graphene, there is only a single layer of carbon atoms.

Answered by Megan M. • Chemistry tutor

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Describe the similarities and differences between ionic and (simple) covalent bonding?

Similarities Doesn't conduct electricity (only when the ionic is in solid) and covalent always (no charged particles) Many dissolve in water Differences Ionic substances loose or gain and electron to beco...

Answered by Holly L. • Chemistry tutor

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Calculate the enthalpy of combustion of 1 mol of ethanol using mean bond enthalpy (kJ/mol) data: C-C (347), C-H (413), C-O (358), O-H (464), O=O (498), C=O (805)

First we need to construct the equation of the combustion: C2H5OH(l) + 3O2(g) --> 2CO2(g) + 3H2O(l)Use aid of structural formulaLeft hand side (endothermic - requires energy):5(413) + 347 + 358 + 464 +...

Answered by Lewis L. • Chemistry tutor

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