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22 Cards in this Set
- Front
- Back
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What is an atom? |
Smallest part of an element. |
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What is an element? |
A substance made of one type of atom. |
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What is a molecule? |
A collection of two or more atoms held together. |
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What is a compound? |
Two or more elements that are chemically combined. |
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What is a pure substance? |
One or more element. |
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What is filtration? |
Separates an insoluble solid from a liquid. |
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What is crystallisation? |
Makes solid crystals from a solution. |
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What is fractional distillation? |
Separates liquids from a mixture of liquids. |
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What is chromatography? |
A process that separates mixtures by how quickly they move through a stationary phase. |
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What is an isotope? |
An atom of the same element with different number of neutrons. |
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What is relative atomic mass? |
An average value of mass. |
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What is the plum pudding model? |
The atom was a ball of positive charge with negative electrons in it. |
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What’s the nuclear model? |
Positive nucleus with electrons surrounding it. Chadwick later discovered neutrons. Bohr later discovered this the arrangement of electrons in shell. |
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Mass of protons, neutrons and electrons. |
1,1 and Very Small |
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What is the mass number? |
Total number of protons and neutrons. |
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What is the atomic number? |
The number of protons. |
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How do you have a high melting point? |
Strong electrostatic force between positive and negative ions in the great lattice. |
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What is exothermic? |
Products at lower energy than reactants. |
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What is exothermic? |
Products at lower energy than reactants. |
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What is endothermic? |
Products at higher energy than reactants. |
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Elements can conduct electricity because... |
Ions are not free to move |
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Is the negative cathode covered with electrons? |
Yes |
