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Chemistry Sem 2
Atomic Structure & Reactions
| Question | Answer |
|---|---|
| What sub-particles make up an atom? | Protons, Neutrons and Electrons |
| What is nomenclature? | The chemical symbol that is used to represent an element. |
| What is the Atomic number? | The Atomic number is the smaller number and indicates the number of protons or electrons |
| What is the Mass number? | The Mass number is the number of protons and neutrons |
| What is the Nucleus? | The centre of the atom. It contains all the weight of the atom. Protons and Neutrons are in the nucleus. |
| What are the electron shells and what do they do? | The electrons move around the nucleus of the atom. They are very light and do not contribute to the mass of the atom. |
| What are the 3 subatomic charges? | Protons: positive charge Neutrons: neutral charge Electrons: negative charge |
| How many electrons can fit in each shell? | K:2, L:8, M:18, N:32 |
| What is a Valence electron? | The number of electrons in the outmost shell |
| What are Isotopes? | Isotopes are atoms of the same elements that differ in the number of neutrons in the nucleus. (all isotopes have the same atomic number) |
| True or false are all isotopes stable? | False |
| What is a stable isotopes? | A stable isotope is one that does not emit radiation, or, if it does its half-life is too long to have been measured |
| What is a chemical reaction? | A chemical change has taken place when a new substance is formed |
| What are the signs of a chemical change? | -Smell of a new substance -Permanent colour change - Gas is given off -Change in temperature indicating energy is produced or absorbed. -Precipitate or solid is formed (mixing two substances together) -One metal deposits on another |
| What are the signs of a physical change? | -Changes shape -Breaks into smaller pieces -Dissolves -Mixes with another substance |
| Reactants and Products | Reactants are the substances present at the start of the chemical reaction and products are the new substances that are formed |
| How do chemical reactions change? | |
| What is an endothermic reaction? | An endothermic reaction is a reaction that absorbs heat, taking it from the surroundings and making them feel colder. Endothermic reactions need energy to proceed and they get their energy from what is around them |
| What is an Exothermic reaction? | While endothermic reactions absorb energy, exothermic reactions release energy.During the reaction, energy is released into the surroundings, usually as heat and or light. |
Created by:
CharlotteHewish
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