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19 Cards in this Set
- Front
- Back
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What is true in chemical reactions
What do the bonds of the reactants and products do? |
Bonds of the reactants are broken.
Bonds of the products are formed. |
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In a compound, chemical energy is contained in the ________?
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Bonds
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What does the arrow mean in a chemical equation?
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yields
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Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction?
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CH4 + 2O2 -> 2H2O + CO2
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In an endothermic, kJ can be found on the __________ side of the equation?
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Left
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In an exothermic, kJ can be found on the ________side of the equation>
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Right
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If the total amount of energy before and after a chemical reaction are the same, then energy is ________?
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Conserved
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A log is burning in a fireplace. If the amount of oxygen reaching the log is decreased, what happens?
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The reaction rate decreases and the flame is smaller.
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What is true about a synthesis reaction?
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Only 1 product is formed.
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The coefficients in a balanced chemical equation always can express the ratio of
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moles of reactants in products
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Reaction rates tell you how fast
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Reactants are being consumed. Products are being formed. Energy is being absorbed or released
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When magnesium carbonate reacts with nitric acid, magnesium nitrate and carbonic acid form.
Carbonic acid then breaks down into water and carbon dioxide. Which 2 types of reactions take place in this process? |
Double replacement
Decomposition |
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The substances that undergo change in a chemical reaction are called _____?
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reactants
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What is the law of conservation of mass?
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Mass cannot be created or destroyed.
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In general, if the temperature of a chemical reaction is increased, the reaction rate ________?
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increases
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What takes place during a redox reaction?
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electrons are gained or lost
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In a chemical reaction, an iron atom became the ion Fe 2+, What happened to the iron atom?
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It lost electrons and was oxidized.
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When most fuels burn, water and carbon dioxide are the 2 main products. Why can't you say that water and carbon dioxide are products of all combustion reactions?
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Some other substances (such as Hydrogen) also burn when fuel does not contain carbon, carbon dioxide.
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What is the purpose of balancing a chemical equation?
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A balanced chemical equation shows that mass is conserved. The number of each type of atom in the reactants must equal the number of each type of atom in the products.
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