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"Un appartement" is a flat and "un immeuble" is a building.
In this question we have to use the equation Moles= Mass(g)/ Mr. We have the mass of PbO2 so to find the moles we need to divide the mass, which is 37.2g, by Its Mr, which is 207.2 + (162) = 239.2. th...
Add a drop of each liquid to individual test tubes.To each test tube, add dilute nitric acid and silver nitrate solution.A precipitate will form for each ion present.chloride= whitebromide= creamiodide= y...
One mark is given for correctly naming each step (of which there are 7 possibilities). Another is given for a correct description of each stage.Prophase: Chromatin condenses to chromosomes / nucleolus dis...
Neutrinos are hard to detect because they are 100,000s of times smaller than an electron, so are too small to detect with current equipment. They also dont have a charge and do not interact with any other...
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