science 0.0 / 5 ? Allc3GCSEOCR Created by: abi syrettCreated on: 18-11-15 13:41 what charge is electrons negative 1 of 13 charged atoms are know as.... ions 2 of 13 positive ions are formed if atoms lose electrons 3 of 13 negative ions are formed if atoms gain electrons 4 of 13 an element has only one type of atom 5 of 13 an compound has different types of atoms 6 of 13 atoms join together using chemical bonds 7 of 13 covalent bonds is when atoms share a pair of electrons 8 of 13 ionic bonds is positive bonds and negative bonds are attracted together 9 of 13 an exothermic reaction is energy is given out th 10 of 13 an endothermic reaction is energy taken in 11 of 13 there is a temperature rise in a reaction, is the reaction exothermic or endothermic? exothermic because heat is given out. 12 of 13 give two things you should to do to make sure a calorimetric experiment is a fair test everthing expect fuel used should be the same, use same apparatus 13 of 13
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