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atoms and compounds

What are the electrons that are farthest from the nucleus? valence
How many valence electrons can an element have? 1 to 8
How many valence electrons make an atom stable? 0, 2, or 8
What makes an atom neutral? The same number of protons and electrons
When an atom becomes charged after gaining or losing electrons it becomes an..... ion
When an atom loses an electron they have a.... positively charged
When an atom gains an electron they become... negatively charged
Name two ions Na and Cl
Name two chemical bonds. Ionic and Covalent
What is an ionic bond? bond between metals and non metals
Ionic bonds produce compounds made up of hard crystals and have what kind of melting point? high
what ending do you put on the second element in an ionic compound? ide Ex: Sodium Sulfide
When does a covalent bond form? When atoms share valence electrons
Where do covalent bonds happen? between nonmetals
What kind of compounds are produced from ionic bonds? molecular
Are molecular compounds poor or good conductors of heat? poor Ex: H2o
What is a polar molecule? a compound with slighlty charged ends
What is a nonpolar molecule atoms that pull equally on the electrons
What is a chemical reaction? when there is a chemical change in a substance
What evidence shows us that a chemical change has happened? color, gas production, temperature, precipatate(liquids mixed to form a solid)
Substances you start with in a chemical reaction are called reactants
The materials you are left with after a chemical reaction are called products
What are the 4 types of chemical reactions called? Exothermic, Endothermic, Synthesis, and Decomposition
In an exothermic reaction energy is released
In an endothermic reaction energy is absorbed
Name and example of an exothermic reaction burning wood
Name an example of an endothermic reaction instant ice pack
What is synthesis? two or more substances combine to make a complex substance
What is decomposition? a complex substance broken down in to simpler substances
What is the Law of Conservation of Mass? The amount of matter involved in a chemical reaction does not change. Mass of Reactants=Mass of Products
What is activation energy? the amount fo energy needed to get a reaction started
What is the collision theory? reactant molecules collide with a certain amount of energy to react and form products
Catalysts speed up reactions
Inhibitors slow down chemical reactions
Created by: tbugbee