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30 Cards in this Set
- Front
- Back
To balance an equation, numbers called ________ are placed in front of substances. They multiply all atoms in that substance.
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coefficients
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When balancing a chemical formula, non-1 numbers, called ____ are placed to the lower right of an ion.
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subscript
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The word ____ means "written below"
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subscript
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Oxidation numbers or ionic charges are written to the upper right of the ion. A name for anything written there a ___
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superscript
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The arrrow in the middle of a chemical equation means....
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yields
produces equals |
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If the left side of a chemical equation has 10 H's and 5 O's then the right side of the equation must have....
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10 H's and 5 O's
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Matter can neither be created....
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nor destroyed.
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Can subscripts be added to a formula to balance an equation?
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No
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Can subscripts be removed from a formula to balance an equation?
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No
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How must the elements Br, I, N, Cl, H, O, & F be written in an equation when they are alone?
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They must have a subscript 2 since they are diatomic elements.
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Which gas supports combustion and causes a glowing splint to relight?
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oxygen
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Which gas extinguishes flames in the flaming splint test?
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carbon dioxide
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Which simple gas burns with a barking sound when a flaming splint is brought near?
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hydrogen
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Which reaction type only has one product (no plus signs on the right)?
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synthesis
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Which reaction type only has one reactant (no plus signs on the left)?
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decomposition
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The _____ are written on the left side of the yields arrow.
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reactants
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The ___ are written on the right side of the yields arrow.
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products
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The symbol for a solid or precipitate in a chemical reaction is....
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(s)
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Another name for a solid that is produced in a reaction is a ...
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precipitate
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The symbol for a water-based solution in a chemical reaction is ....
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(aq)
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The symbol for a pure liquid such as water or mercury in a chemical reaction is...
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(l)
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The symbol for a gas in a chemical reaction is....
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(g)
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A reaction that has 2 single elements and 2 compounds is ...
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single replacement
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A reaction that involves 4 compounds is...
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double replacement
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The reaction that has a hydrocarbon compound + oxygen to produce carbon dioxide + water + heat is....
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combustion
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Reactions that release heat are said to be....
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exothermic
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Reactions that require that heat be added to make them occur are called...
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endothermic
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A reaction in a test tube that makes the test tube cold is an ___ reaction.
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endothermic
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A reaction in a test tube that makes the test tube hot is an ____ reaction
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exothermic
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To make baking soda release carbon dioxide in a decomposition reaction, we had to heat it strongly with a burner. This is an example of an ____ reaction.
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endothermic
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