click below
click below
Normal Size Small Size show me how
Chemistry Quiz #2
Question | Answer |
---|---|
Why do aroms form chemical bonds? | They want to become stable and fill their outer shell with valence electrons |
Valance Electrons | Electrons in the outer shell |
Ion | A positive or negative charged atom |
Ionic bond | a bond made by the transfer of electrons |
Covalent bond | a bond made by sharing electrons |
Chemical reaction | when bonds are made or broken to form new substances |
What might indicate the occurrence of a reaction (4 things) | A spontanious color change, a spontanious production of energy such as heat or light, the production of precipitate, the formation of a gas |
What is a chemical reaction? | A process that changes 1 or more substances into another substance |
What is a chemical equation? | A short-hand way of showing whats happening during a chemical reaction |
Reactant | A beginning material. Written before the arrow |
Product | An ending material. Products are written after the arrow. |
A balance equation | When writing a chemical equation the number of atoms on the reactant side MUST equal the number on the product side? |
Mass/energy (3) | cant be created, cant be destroyed, can only change |
What factors affect the rate a reaction takes place? (4) | Temperature, surface area, concentration, add of catalyst. |