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 Reactions and Equations 50 Flashcards |
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What is the definition of decomposition in chemistry? |
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Decomposition is a chemical reaction where a compound breaks down into its elements or simpler substances. |
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In Joseph Priestley's experiment, heating mercuric oxide produced which two elements? |
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 Mercury (Hg) and oxygen (O₂). |
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Fill in the blank: Mercuric oxide (HgO) decomposes into ___ and ___ when heated. |
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 Mercury and oxygen |
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True or False: The process of decomposition requires the application of energy to break the bonds in a compound. |
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 True |
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Riddle: I am a compound that turns into two elements when heated; the first is a metal, the second a gas vital for life. What am I? |
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 Mercuric oxide (HgO) |
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What is the significance of Joseph Priestley's experiment with mercuric oxide? |
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It demonstrated that mercuric oxide decomposes into mercury and oxygen, helping to establish the role of oxygen in air and its necessity for life. |
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Describe the structure of mercuric oxide and its behavior during decomposition. |
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Mercuric Oxide Structure Mercuric oxide decomposes into mercury.
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Fill in the blank: In a chemical reaction, atoms that were bonded ___ and form new bonds with other atoms. |
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 Break apart |
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What does the conservation of matter imply in the context of chemical reactions? |
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It implies that the number of each type of atom remains the same before and after the reaction, ensuring that matter is neither created nor destroyed. |
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What principle states that matter is conserved in a chemical reaction? |
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Conservation of matter is essential.
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Fill in the blank: In the decomposition of mercury(II) oxide (HgO), the simplified equation is ___ → ___ + ___. |
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 2 HgO → 2 Hg + O₂ |
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True or False: The total number of atoms in the products of a chemical equation must equal the total number of atoms in the reactants. |
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 True |
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What is the ratio of hydrogen to oxygen atoms in the decomposition of water? |
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 The ratio of hydrogen to oxygen atoms in the decomposition of water is 2:1. |
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Riddle: I am a process that breaks down a compound into simpler substances, often requiring energy. What am I? |
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 Decomposition |
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What does the arrow (→) in a chemical equation represent? |
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 The arrow (→) indicates the direction of the reaction from reactants to products. |
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Fill in the blank: In the decomposition of water (H₂O), ___ hydrogen molecules are produced for every ___ oxygen molecule. |
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 2 hydrogen molecules; 1 oxygen molecule |
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How many mercury atoms are present in the unsimplified equation 10 HgO → 10 Hg + 5 O₂? |
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 There are 10 mercury atoms present on both sides of the equation. |
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Short Answer: What energy source is mentioned as necessary for the decomposition of water? |
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 Energy from a battery is necessary for the decomposition of water. |
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What is the chemical equation for the reaction of magnesium and oxygen to form magnesium oxide? |
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 2 Mg + O₂ → 2 MgO |
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Fill in the blank: Acetylene and oxygen react with heat to form ___ and water. |
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 Carbon dioxide |
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True or False: The balanced equation for the decomposition of nitrogen dioxide is 2 NO₂ → O₂ + N₂. |
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 True |
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What was the purpose of using carbon in the smelting of iron oxide by indigenous iron-workers? |
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 To reduce iron oxide (Fe₂O₃) to iron (Fe) and produce carbon dioxide (CO₂). |
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Riddle: I am used in flame-cutting steel, and when I react with oxygen, I produce carbon dioxide and water. What am I? |
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 Acetylene (C₂H₂) |
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Fill in the blank: The unbalanced chemical equation for the combustion of acetylene is C₂H₂ + O₂ → ___ + ___ . |
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 CO₂ + H₂O |
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What is the balanced equation for the reduction of iron oxide using carbon? |
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 2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂ |
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