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10 Cards in this Set
- Front
- Back
What are physical and chemical changes, the differences between them? (core)
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The change that takes place in a substance by heating it, adding water to it, or mixing it, is either a physical change or a chemical one.
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What are the differences between elements, compounds and mixtures? (core)
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An element contains only one kind of atom, a compound contains atoms of different elements joined together and a mixture contains more than one substance.
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What is a mixture? (extented)
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A mixture contains more than one substance, the substances are mixed together, not chemically combined.
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What is an element? (extented)
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An Element contains only one kind of atom.
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What is a compound? (extented)
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A compound contains atoms of different elements joined together.
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What is the structure of an atom in terms of electrons and a nucleus containing protons and neutrons? (core)
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Atoms consist of a nucleus and a cloud of electrons that move round the nucleus. The nucleus is itself a cluster of two kinds of particles, protons and neutrons.
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What are the relative charges and approximate relative masses of protons, neutrons and electrons? (core)
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The mass of protons and neutrons is 1 unit, the mass of an electron is almost nothing. Protons have a positive charge (1+), neutrons have no charge and electrons have a negative charge (1-).
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What is the proton number? (core)
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The proton number is the number of protons in an atom.
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What is the nucleon number? (core)
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The nucleon number is the total number of protons and neutrons in an atom.
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What are isotopes? (core)
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Isotopes are atoms of the same element, with different numbers of neutrons.
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