Chem 3.1-3.7
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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| pure substances | type of matter that has a definite composition
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| elements | simplest pure substances because they are composed of only are kind of atom
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| compounds | two or more elements in the same proportion
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| mixtures | two or more substances that are pysically mixed, but not chemically combined
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| types of mixtures | homogeneous & heterogeneous
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| homogeneous mixture | aka solution; composition is uniform throughout a sample (salt water)
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| heterogeneous mixtures | components do not have a uniform composition throughout the sample (oil & water, raisins in a cookie)
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| chemical symbols | one- or two-letter abbreviations for the names of the elements
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| physical properties | characteristics that can be observed or measured w/o affecting the identity of an element (shape, color, odor, taste, density, hardness, melting point, boiling point)
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| periodic table | the arrangement of elements created by Dmitri Mendeleev
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| period | horizontal rows in the periodic table
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| group | vertival columns on the periodic table
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| atom | the smallest particle of an element that retains the characteristics of that element
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| nucleus | positively charged region at the center of the atom
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| amu (atomic mass unit) | used in expressing masses of neutrons, protons, ect
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| atomic number | equal to the protons
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| mass number | protons + neutrons= mass number
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| isotopes | atoms of the same element that have different numbers of neutrons
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| atomic mass | average of the mass of isotopes of an elements
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| valence electrons | outermost electrons
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| group numbers | (1A-8A); indicates the number of valence electrons in an element
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| atomic radius | the distance from the nucleus to the valence electrons
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| ionization energy | energy needed to remove the least tightly bounded electron from an atom in the gaseous state.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
adiya117
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