Chemstry for middle school
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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| electron cloud | area around the nucleus where electrons are found
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| valence electrons | electrons on the outer level of an atom
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| atom | building blocks of matter
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| atom | smallest part of an element
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| matter | made up of atoms
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| subatomic particles | protons, neutrons and electrons
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| subatomic particles | particles that are smaller than an atom
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| protons | postiviely charged particles in the nucleus
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| neutrons | neutral particles in the nucleus
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| electrons | negatively charged particles in the nucleus
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| element | simplest substance made up of only one type of atom
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| compound | made up of 2 or more elements
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| molecule | groups of atoms bonded together
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| hydrogen | lightest element
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| Physical change | a change in properties that is reversible
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| Chemical change | a non reversible change in which a new substance is made
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| atomic number | number of protons in an atom
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| chemical formula | shortcut way to write a molecule using subscripts and coefficients
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| subscripts | Small number that comes after a symbol that tells how many atoms of an element
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| coefficient | large number in front of a chemical formula that tells how many molecules
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| exothermic | reaction that gives off heat
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| endothermic | reaction that absorbs heat (feels cold)
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| chemical reaction | atoms rearrance to make a new substance
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| chemical equation | using formulas to show what happens in a chemical reaction
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| Law of conservation of matter | no atoms/matter are created or destroyed in a chemical reaction. Atoms are rearranged.
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| Law of conservation of matter | mass of reactants = mass of products
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| reactants | chemicals on the left side of an equation that are mixed together
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| products | chemicals on the right side of an equation that are made in a reaction
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| electron shell | Orbits or paths where electrons travel around the nucleus
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| electron level (same thing) | electron shell (same thing)
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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.
To hide a column, click on the column name.
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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.
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:
jhenretta
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