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16 Cards in this Set
- Front
- Back
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easy: How do you find the atomic number of an atom?
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the number of protons is the number
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medium: What is a characteristic of all alkali metals and alkaline earth metals?
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they form alkaline solutions when mixed with water
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easy: what are the three basic components of an atom?
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Protons, electrons and neutrons.
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what is an element?
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an element is a pure substance that cannot be broken into any other substances by chemical or physical means.
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how can you tell one element form another
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by their physical properties and chemical properties.
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Whar holds atoms together in a molecule?
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a chemical bond.
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How can oxygen be both an element and a molecule?
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Its an element when its only 1 atom and a molecule when it's 2 or more atoms.
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Why are compounds a kind of pure stubstance?
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they cannot be broken down/separated.
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how are compounds different form the elements that make them up?
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When elements are chemically combined, they form compounds having properties that are different from those of uncombined elements.
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Is a mixture a pure substance?
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no it isnt. it can be separated.
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How do mixtures differ from compounds?
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substances in mixtures keep their properties and substances can be separated. substances in a compounds can do neither.
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How do heterogeneous and homogenous differ?
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heterogenous mixtures have parts taht can be seen. you cant see all the parts in a homogenous mixture without a microscope.
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What are valence electrons?
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Electrons with the highest energy levels. The number of valence electrons determine many properties of that element, including ways in which atoms can bond with other atoms.
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How little is a electron compared to a proton?
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an electron is 1/836 of a proton.
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what is a covalent bond?
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A covalent bond is a chemical bond formed when two atoms share electrons.
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what is an ionic bond?
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An ionic bond is the attraction between two oppositely charged ions.
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