Chemical Reactions, lessons 1 & 2
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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| Anything that has mass and takes up space. | matter
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| The study of matter and how matter changes. | chemistry
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| A characteristic of a substance that can be observed without changing the substance into another substance. | physical property
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| A characteristic of a substance that describes its ability to change into other substances. | chemical property
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| Any change that alters the form or appearance of a substance but that does not make the substance into another substance | physical change
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| A change in matter that produces one or more new substances is a _______________. | chemical reaction or chemical change
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| A solid that forms from solution during a chemical reaction. | precipitate
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| A reaction in which energy is absorbed. | endothermic reaction
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| A reaction that releases energy in the form of heat. | exothermic reaction
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| A short, easy way to show a chemical reaction, using symbols instead of words. | chemical equations
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| The substances you have at the beginning of an equation. | reactants
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| When the reaction is complete, you have new substances called the ____________. | products
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| principle that states that during a chemical reaction, matter is not created or destroyed. | conservation of mass
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| In an _____________________, matter can enter from or escape to the surroundings. | open system
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| In a _____________, matter is not allowed to enter or leave. | closed system
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| A number placed in front of a chemical formula in an equation. | coefficient
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| When two or more elements or compounds combine to make a more complex substance, the process is called __________. | synthesis
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| Breaks down compounds into simpler products. | decomposition
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| When one element replaces another in a compound, or when two elements in different compounds trade places, the process is called ______________. | replacement
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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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