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Yes or No
The total oxidation number of a compound is zero. |
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Yes or No
A single-replacement reaction always contains at least three elements. |
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| Write the balanced chemical equation for the following word equation: When carbon monoxide burns, it reacts with oxygen to produce carbon dioxide. |
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| Why can chemical changes be expressed in equations? |
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Definition
| Because of the law of conservation of matter, the total amount of matter present before a reaction must equal the total after the reaction. |
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| Write the formula and name for the combination of calcium and sulfur. |
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| If an element symbol in a chemical formula has no subscript, what is assumed? |
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Definition
| subscript of one is understood |
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What type of reaction is
Ba + 2HCl→BaCl2 + H2 |
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Definition
| single-replacement reaction |
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What type of reaction is
HCl + KOH→HOH + KCl |
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| double-replacement reaction |
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What type of reaction is
N2 + 2O2→2NO2 |
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What type of reaction is
2KClO3→2KCl + 3O2 |
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What type of reaction is
CaCO3→CaO + CO2 |
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What type of reaction is
C2N2 + 2O2→2CO2 + N2 |
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Definition
| single-replacement reaction |
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| What kind of change happens when you place a copper wire in a clear solution and a gray solid forms on the wire? |
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| What kind of change happens when you mix two clear liquids in a beaker and a brown solid layer settles out at the bottom of the beaker? |
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| What kind of change happens when water breaks up into hydrogen and oxygen gas? |
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| Give the correctly balanced chemical equation for the following word equation: Magnesium metal and gaseous oxygen react to produce magnesium oxide. |
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| In rusting, iron metal reacts with oxygen in the atmosphere to form iron oxide. If 20 atoms of iron change, how many atoms of iron are in the resulting iron oxide? |
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| Carbon and oxygen can combine as CO. What is the name of CO? |
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| Which is the correct formula for ammonium chloride? |
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| What is the oxidation number of a lithium ion (Group 1A)? |
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| How many carbon atoms are in octane, if its empirical formula is C4H9 and its molecular formula has twice the number of atoms as the empirical formula? |
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| Why do chemical equations need to be balanced? |
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Definition
| See p. 473...law of conservation of matter. Since matter can be neither created nor destroyed, the total amount of matter present before a reaction must equal the total amount of matter present after the reaction. |
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| Categorize and give three examples of energy transformations during chemical reactions. |
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Definition
See p. 472-473
Chemical to thermal (exothermic), chemical to light (flames or light), chemical to sound (the "kaboom" during an explosion), chemical to mechanical (dynamite moving rock), and chemical to electrical (current produced, such as in a battery). |
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| How are subscripts assigned to atoms in a compound? |
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Definition
| Because the oxidation number of a compound is zero, the sum of all the oxidation numbers of all the atoms in the molecule is zero. By looking at the oxidation rules, you should be able to find the oxidation numbers of the elements in the molecule. If the numbers do not already balance, one or both of them must then be multiplied by the correct number of atoms to balance each other out. |
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