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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 |