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Flashcards in Science 4 Deck (22):
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Element

A substance made up of only 1 type of atom

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Example of element

Zinc, oxygen, carbon

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Compound

2 or more elements chemically combined

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Compound example

Sodium chloride, hydrogen sulfide

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Mixtures

2 or more different substances that are NOT chemically combined

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Mixture example

Salt water, air

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Atom

The smallest particle of a substance that can exist and still be that substance

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Nucleus

Found in the centre of atoms, it contains protons and neutrons

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Electron

Negative particles surrounding the nucleus

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Protons

Positive particles found in the nucleus

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Neutrons

Neutral particles found in the nucleus

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Sub Atomic Particles

A particle less complex than an atom. Protons electrons and neutrons are all a subatomic particles

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Atomic Number

The atomic number is equal to the number of protons in an atom

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Mass number

The mass number is equal to the number of protons added onto the number of neutrons in an atom

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Isotope

An atom that has the same number of protons but a different number of neutrons. Same atomic number different mass number.

Can be radioactive

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Shells

Regions around the nucleus where where electrons travel around the nucleus at high speed

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Valence Electrons

an electron in the outer shell of an atom which can combine with other atoms to form molecules

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Reactants

The different substances added together to create a chemical reaction

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Products

Compounds formed after a chemical reaction has taken place

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Law of conservation

The law that states that the mass of the reactants equals the mass of the products

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Law of Constant Proportions

The law states that no matter what happens certain elements will always bind with other specific elements
E.g. 2 atoms of Oxygen will always bind with 1 atom of carbon to form CO2

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Enthalpy

Stored energy in the bonds that hold atoms together