P2 mistakes

• colourless • have same Rf values

• allow solvent travel further • use a different solvent

• solvent moves through paper • different dyes have different solubilities in solvent • different attractions to paper • carried different distances

• Dead plants buried under layers of rock • Heat and pressure forms coal

• When carbon reacted with the ocean it formed metal carbonates • Included Calcium Carbonate • Used for shells and skeletons • Compressed by heat and pressur

• Short wavelength radiation pass from sun throgh the greenhouse gases • The earth absorbs some of the short wavelength radiation - remits it as thermal long wavelength • This long wavelength radiation is absorbed by greenhouse gases • The Greenhouse gases re-radiate the thermal radiation in all directions including back to earth warming up the surface of the planet

Increased conc/pressure: • There are more particles in the same volume • There is a higher frequency of collisions • higher rate of reaction

• add bromine water • shake • alkene = orange –> colourless

• red dye more attract to paper • spends greater proportion of time distributed in paper

• bubbles of hydrogen • sodium (alcohol) oxide

• rate forewards = rate backwards • conc. of reactants and products don’t change