nooo 0.0 / 5 ? ChemistryAcids, bases and saltsGCSEAQA Created by: katrinamcmahonCreated on: 08-03-17 18:23 What is the surface area to volume ratio in nanoparticles? They have a high surface area to volume ratio, (for their small size they have a large surface area) 1 of 13 What does Mr stand for? Relative formula mass. 2 of 13 What does Ar stand for? Relative atomic mass. 3 of 13 What is an isotope? An atom of the same element with the same number of protons but different number of neutrons. 4 of 13 What does relative atomic mass take into account? The elements different isotopes. 5 of 13 Would you expect the same reaction for each isotope of an element? Yes because they are all the same atom and have the same amount of electrons, which is what is involved in reactions. 6 of 13 How many masses would you expect to find in the Cl2 atom? 2 (Because of the no.2) 7 of 13 What is one mole of a substance? The relative formula mass of a substance in grams. 8 of 13 What is the mass of 1 mole of water? (H=1 O=16) H20 = (2*H) + (1*O) = (2*1) + (1*16) =18g 9 of 13 What is the mass of 2 moles of water? (H=1 O=16) H20 = (2*H) + (1*O) = (2*1) + (1*16) =18g*2 = 36g 10 of 13 What is the mass of 1/2 a mole of water? (H=1 O=16) H20 = (2*H) + (1*O) = (2*1) + (1*16) =18g/2 = 9g 11 of 13 How do you find out the Ar of an element? Look at the mass number on the periodic table. 12 of 13 What is the formula for the percentage of an element in compound? Ar * number of atoms of the element divided by the Mr and * 100 13 of 13
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