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Fichas por Usman Rauf, actualizado hace más de 1 año
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Creado por Josh Price
hace más de 9 años
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Copiado por Usman Rauf
hace más de 9 años
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| Pregunta | Respuesta |
| What does dry air consist of? Elements? Compounds? | Elements: Oxygen, Nitrogen, Argon Compounds: Carbon Dioxide |
| How much of each gas is in the atmosphere? | Nitrogen: 78% Oxygen: 21% Argon: 1% Carbon Dioxide: 0.04% |
| What are the symbols for the main gases which make up the air? | N2 = Nitrogen O2 = Oxygen Ar = Argon CO2 = Carbon Dioxide |
| Most non-metals and most compounds between non-metals are m_______. | Molecular |
| Molecular elements and elements with small molecules have ______ melting and boiling points. | Low |
| What form do molecular elements take at room temperature? Why? | Gas They consist of small molecules with weak forces of attraction between the molecules. |
| Do pure molecular compounds conduct electricity? Why? | No Their molecules are not charged. |
| What is covalent bonding? How does it arise? | Bonding within molecules. Electrostatic attraction between the nuclei of the atoms and the electrons shared between them. |
| Are covalent bonds strong? | Yes |
| What does the hydrosphere consist of? | Mainly water, with some dissolved compounds (salts). |
| How are the ions in crystals of a solid ionic compound arranged? | A regular way, forming a lattice. |
| What is ionic bonding? | The forces of attraction between oppositely charged ions, which hold together ions in a crystal. |
| What happens to the ions when an ionic crystal dissolves in water? | They separate and can move around freely. |
| Why do ionic compounds conduct electricity when dissolved in water? | Because the ions are charged and they are able to move around independently in the solution. |
| How can ions in ionic compounds be detected? | They have distinct properties and they form compounds with distinct properties. |
| Some metal ions can be identified in solution by adding a______ because they form i______ h_______ with characteristic colours. | Alkali Insoluble Hydroxides |
| Some n_______ i_____ can be identified in solution by adding a r_____ that reacts with ions to form an i_______ s_____. | Negative Ions Reagent Insoluble Solution |
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