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Year 10 Chem HB
| Question | Answer |
|---|---|
| What is the maximum amount of electrons in the first shell | 2 |
| What is the maximum amount of atoms in the second shell | 8 |
| What are valence electrons | valence electrons are the electrons in the outer shell. It is the same number as the group they are in. |
| Is the group number the number of electrons in the outer shell | YES |
| Is the period or row number the same as the amount of shells | YES |
| What are the energy levels | The energy levels are the horizontal rows on the periodic table |
| What is the most reactive metallic atom | Francium |
| What is a combination reaction | Two reactants combine to form one product A + B --> AB |
| Decomposition | When one reactant decomposes to form 2 or more products AB --> A+B |
| Single replacement | One substance replaces another in a compound AB+C --> AC+B |
| Double displacement | Two substances are displaced AB+CD --> AD+BC |
| Combustion | When a substance reacts with oxygen to produce carbon dioxide or water |
| What is the general form of an equation | Reactant --> Products |
| Do you use subscripts to balance an equation | NO |
| What is used to balance chemical equations | Coefficients |
| Define Element | Atoms os the same type |
| Define Molecule | 2 or more atoms of the same type joined together of same type |
| Define compound | A group of different atoms joined together |
| Whats is a formular | It is the number of atoms of each type in a compound |
| What are the symbols for: Aluminium | Al |
| Flourine | F |
| mercury | Hg |
| Sodium | Na |
| Copper | Cu |
| silver | Ag |
| Name the following: Sn | Tin |
| Na | Sodium |
| Cl | Chlorine |
| K | Pottasium |
| Pb | Lead |
| Fe | Iron |
| What is a chemical reaction | re arrangement of atoms to form new substances |
| What is a chemical equation | The representation of reactants and products |
| What is an ionic substance | between metal and non metal, form salts |
| Solute | Substance dissolved in solvent |
| Solvent | Substance that dissolves the solute |
| Solubility | A certain amount of a particular substance that can dissolve in a given volume of water |
| Solution | A mix of dissolved solute in solvent |
| What is the rate of reaction | How fast or slow a reaction is |
| What are the factors effecting the rate of reaction | 1. Concentration - Increases number of collisions 2. Temperature - Increases energy of particles, collide more often 3. Surface area - more area for collisions to occur 4. Catalyst - reduces amount of energy needed in collisions |
| Independent variable | The variable that stays the same. Variable changed on purpose |
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