triple science test revision 0.0 / 5 ? ScienceChemistryGCSEEdexcel Created by: jwstoneeCreated on: 12-02-19 11:42 define an isotope an isotope is atoms of the same element with a different number of neutrons 1 of 13 calculate the R.A.M. of chlorine. chlorine - 35 = 75% chlorine - 37 = 25% (35 x 75) + (37 x 25) = 3550/ 100 = 35.5 2 of 13 what is an ionic bond? an ionic bond is a chemical bond formed by the transfer of electrons betwwen a metal and a non-metal 3 of 13 what are electrostatic forces? electrostatic forces hold oppositely joined ions 4 of 13 what is an anion? a negative ion 5 of 13 what is a cation? a posotive ion 6 of 13 what is the ionic formula of aluminium oxide? Al2O3 7 of 13 what is the poly atomic formula of sodium hydroxide? NaOH 8 of 13 define a covalent bond a covalent bond is between 2 non-metalsand contains a shared pair of electrons 9 of 13 what is empirical formula? empirical formula is the simplest whole number ratio of atoms in a molecule 10 of 13 what is molecular mass? molecular mass is the sum of the atomic masses of all the atoms in a molecule 11 of 13 how do you work out concentration? concentration = mass of solute(g)/volume of solution(gdm3) 12 of 13 how can graphite conduct electricity? each carbon atom is covalently bonded to only 3 other carbon atoms meanin there is a delocalised electron which can hold a current 13 of 13
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