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What are the properties of a giant covalent structure?

Giant covalent structures are made up of many covalent bonds between atoms. They have high melting points because it takes a lot of energy to break the strong covalent bonds between the atoms. They cannot co...
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Answered by Phoebe T. • Chemistry tutor
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Calculate the pH of the solution formed when 30 cm3 of 0.150 moldm-3 aqueous sulfuric acid is added to 30 cm3 of 0.200 moldm-3 aqueous potassium hydroxide at 25 C.

H 2 SO 4 ---> 2H + + SO 4 2- KOH ---> OH - + K + Initial moles of Sulfuric acid: Volume x Concentration = Moles (30/1000) x 0.150 = 4.5x10 -3 mol Moles of H + made by sulfuric acid: It is a 1:2 ratio o...
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Answered by William D. • Chemistry tutor
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Define the term relative isotopic mass. (2 Marks)

Mass of the isotope/atom compared to 1/12th the mass of an atom of Carbon 12 (12C)
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How do some toxic chemicals cause environmental and health problems? (2 Marks)

Persists in the environment/soil/water. Enters the food chain and builds up the higher up the chain you move. Can enter human tissue eventually.
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Describe how sigma and pi bonds form and describe how single and double bonds differ.

The sigma bond results due to the overlapping of orbitals along an inter-nuclearaxis. In other words if two s orbitals are directly overlapping, then the bond formed is linear between the two nuclear centres...
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Answered by Neil G. • Chemistry tutor
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