Atomic Structure & Reactions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What sub-particles make up an atom? | Protons, Neutrons and Electrons
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| What is nomenclature? | The chemical symbol that is used to represent an element.
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| What is the Atomic number? | The Atomic number is the smaller number and indicates the number of protons or electrons
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| What is the Mass number? | The Mass number is the number of protons and neutrons
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| What is the Nucleus? | The centre of the atom. It contains all the weight of the atom. Protons and Neutrons are in the nucleus.
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| 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.
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| What are the 3 subatomic charges? | Protons: positive charge
Neutrons: neutral charge
Electrons: negative charge
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| How many electrons can fit in each shell? | K:2, L:8, M:18, N:32
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| What is a Valence electron? | The number of electrons in the outmost shell
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| 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)
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| True or false are all isotopes stable? | False
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| 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
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| What is a chemical reaction? | A chemical change has taken place when a new substance is formed
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| 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
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| What are the signs of a physical change? | -Changes shape
-Breaks into smaller pieces
-Dissolves
-Mixes with another substance
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| Reactants and Products | Reactants are the substances present at the start of the chemical reaction and products are the new substances that are formed
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| How do chemical reactions change? |
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| 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
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| 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.
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Created by:
CharlotteHewish
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