Study Guide; Chapter 19
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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| What happens during a chemical reaction? | A new material is formed by the rearrangement of atoms.
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| What is used to represent a chemical reaction? | A chemical equation.
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| Materials about to react are called and are located | Materials about to react are called reactants and are located to the left of an arrow.
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| Newly formed materials are called what? They are located where? | They are called products and they are located after the arrow in a chemical equation.
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| List the 4 phases represent in a chemical equation and give their symbol | (s) solid; (g) gas; (l) liquid; (ag) aqueous
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| Materials dissolved in water are designated for what? | (aq) aqueous
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| The numbers placed in front of a chemical equation are called what? Their purpose is what? | Coefficients and they show ratio.
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| State the Principle of Conservation of Mass | Matter is neither created nor destroyed during a chemical reaction.
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| Are atoms gained or lost during a chemical reaction? | Neither gained nor lost, they just switch partnert to form new molecules.
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| What is meant by saying a chemical equation must be balanced? | Each atom in it must appear on both sides of the arrow the same number of times.
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| A coefficient tells us the number of times a ________ must be _______. | chemical ; counted
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| How many H atoms are in 2H2O? How many O atoms? | 4 ; 1
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| Equations can be balanced by changing what? To produce correct what? | Coefficients ; Proportions
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| Why is it important not to change subscripts? (subscripts are the numbers that appear lower than and after | Because it changes the chemical's idenity.
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| Balance the equaqtion: ___Fe (s) + ___O2 (9) ——^ ___F62O2 (s) | ___Fe (s) + ___O2 (9) ——^ ___F62O2 (s)
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| Balance the equation: __H2(g) + __N2(g) ——+» __NH3(g) | __H2(g) + __N2(g) ——+» __NH3(g)
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| Balance the equation: _Cl2 (g) + __KBr (aq) —>- _____Br2 (I) + ___KCI (aq) | _Cl2 (g) + __KBr (aq) —>- _____Br2 (I) + ___KCI (aq)
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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.
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.
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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