Chemistry Paper 1 ( Gcse Aqa ) Already Passed

What does reagent mean? {Ans: Reactant}Energy is always _____ in reactions {Ans: - conserved - this means energy cannot be created or destroyed}although electrolysis is very expensive (due to the amount of energy it requires), the usefulness of the product outweighs ... {Ans: the cost of running it}What are reaction profiles used to show? {Ans: - the energy of reactants and products - activation energy - the overall energy change}What is relative formula mass? {Ans: the sum of the relative atomic masses of the atoms in the compound}MDV equation {Ans: Mass = density/concentration x volume}two examples of fullerenes .... {Ans: Buckminsterfullerene ( first discovered - C60 ) and nanotubes}When does ionic bonding occur? {Ans: When a metal reacts with a non-metal}How can ionic bonding be shown? {Ans: Dot and cross diagrams}Describe how negative or positive ions form? {Ans: - negative ions are formed when electrons are gained (because there will be more negative charges than positive charges) - positive ions are formed when electrons are lost (because there will be more positive charges than negative charges)}electrolysis : metals form .... {Ans: positive ions (cations) and migrate to negative electrode