7th CK SCIENCE - COOL CHEMISTRY PART 1 COMPLETE
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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| Acids | produce H+ ions when dissolved in water; they are sour and corrosive
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| Alchemy- | an ancient, mystical practice that preceded the science of chemistry. Alchemists tried to convert common, inexpensive metals into gold.
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| Atom | basic building block of all substances in the universe; smallest complete unit of matter
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| Atomic mass | the total number of protons and neutrons in the nucleus
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| Atomic number | the total number of protons in the nucleus; should be the same as the number of electrons because atoms want to be neutral
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| Bases – | produce OH (hydroxide) ions when dissolved in water; they are bitter and can be corrosive
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| Chemical equation | describes chemical reactions by using chemical formulas
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| Coefficient | number placed before chemical symbols
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| Compound | substance made of heterogeneous molecules that are bonded together chemically. (hetero = different) The elements always come in definite proportions.
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| Covalent bonds | bonds between two nonmetals
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| Electrons | negatively charged particles located outside of the atomic nucleus
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| Element | made of only one type of atom
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| Family | a vertical column on the periodic chart
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| Gas | form of matter with indefinite shape and volume
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| Ion | when the number of electrons varies within the atoms of an element
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| Ionic bonds | bonds between metal and nonmetaL
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| Isotope | when the number of neutrons varies within the atoms of an element
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| Liquid | form of matter with indefinite shape and definite volume
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| Litmus paper | - a pH indicator that turns red in the presence of acids and turns blue in the presence of bases
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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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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.
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:
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