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tessascience
science 20
| Question | Answer |
|---|---|
| electron | a negativley charged particle located in the region surrounding the nucleus of an atom |
| energy level | a specific region surrounding the nucleus that is available for electrons |
| atomic number | the number of protons in the nucleus of an atom |
| neutron | a neutral particle located in the nucleus of the atom |
| mass number | the total number of protons and neutrons in an atom |
| valence electron | an electron that occupies the outermost energy level in an atom |
| proton | a positivley charged particle located in the nucleus of an atom |
| cation | a postivley charged ion |
| atomic mass | the average mass of the atoms of an element including all isotopes |
| element | a pure substance which cannot be broken down into simpler substances by chemical means |
| anion | a negativley charged ion |
| atom | the smallest part of an elemnt that has all the properties of that element |
| non metal | an element that is not flexible does not conduct electricity and tends to form negative ions |
| ionic bond | a bond formed by the simultaneous attraction between positive and negative ions |
| molecular compound | a pure substance formed from non metals |
| metal | a malleable and ductile element that has lustre has good heat and electrical conductivity and tends to form positive ions |
| molecule | a particle containing a fixed number of covalently bonded non metals |
| ionic compound | a pure substance formed from a metal and a non metal |
| covalent bond | a bond formed by the simultaneous attraction of two nuclei for a shared pair of electrons |
| compound | a pure substance formed from atoms of two or more elements with different atoms joined in fixed ratios |
| solute | a substance that dissolves |
| exothermic change | a chemical change in which energy usually in the form of heat is released into the surroundings |
| non electrolyte | a solute in a solution that does not conduct electricity |
| solvent | a substance in a solution that breaks down the bond of a solute |
| solution | a homogeneous mixture of dissolved substances that contains a solute and a solvent |
| chemical change | a change in which one or more new substances with different prperties are formed |
| dissociation | the seperation of an ionic compound into individual ions in a solution |
| endothermic change | a chemical change in which energy is absorbed from the surroundings |
| aqueous solution | a solution in which water is the solvent |
| electrolyte | a solute that forms a solution that conducts electricity |
| standard solution | a solution having a precisley known concentration |
| mole | a specific amount of a substancethat consists of 6.022 times 10 to the power of 23 |
| acid | a substance taht produces hydrogen ions when dissolved in water to form a conducting aqueous solution |
| molar concentration | the amount of solute in moles per litre of solution |
| molar mass | that mass of one of the mole of a substance |
Created by:
tessahughes
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