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 Hydrogen 40 Flashcards |
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What percentage of the universe is made up of hydrogen? |
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About 90% |
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Fill in the blank: Hydrogen is the first element in the ______. |
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Periodic table |
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True or False: Hydrogen is the most abundant element on Earth. |
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False. Hydrogen makes up only 1% of the Earth's crust, oceans, and atmosphere. |
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What is the chemical formula for water? |
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H₂O |
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Riddle: I am a colorless and odorless gas, the lightest of all, and I can make water when I burn. What am I? |
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Hydrogen |
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Who discovered hydrogen and called it 'inflammable air'? |
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Henry Cavendish |
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Fill in the blank: Hydrogen reacts with oxygen to produce ______. |
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Water |
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Which method is used to produce hydrogen in large-scale industries? |
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Bosch's process |
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True or False: Hydrogen burns with a pale blue flame and produces heat energy. |
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True |
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What is the boiling point of hydrogen? |
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-253°C |
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Which metals can react with cold water to release hydrogen? |
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Potassium, sodium, and calcium |
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Fill in the blank: The process of passing electric current through acidulated water to produce hydrogen and oxygen is called ______. |
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Electrolysis |
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Riddle: I can be used to make ammonia and produce a flame for cutting metals, yet I'm the simplest element. What am I? |
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Hydrogen |
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What is the activity series of metals used for? |
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To determine which metals can displace hydrogen from acids or water. |
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True or False: Hydrogen can be found in large amounts in the Earth's crust. |
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False. Most hydrogen on Earth is found in water. |
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What is the reaction of hydrogen with chlorine in sunlight called? |
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Formation of hydrogen chloride gas |
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Fill in the blank: Hydrogen reacts with finely divided iron dust to form ______ under high temperature and pressure. |
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Ammonia |
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Which gas is produced when hydrogen burns in air? |
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Water vapor |
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Riddle: I am a process where hydrogen acts as a reducing agent to convert compounds by removing oxygen. What am I? |
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Reduction |
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What is the density of hydrogen compared to air? |
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Hydrogen is 20 times lighter than air. |
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