12085739
Descripción
Fichas por Henry Smith, actualizado hace más de 1 año
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Creado por Henry Smith
hace casi 7 años
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| Pregunta | Respuesta |
| Endothermic reaction | An endothermic reaction is a chemical reaction that takes in energy from the surroundings. |
| Exothermic reaction | An Exothermic reaction is a chemical reaction that releases energy by light of heat. |
| Electrolysis | Electrolysis he process by which iconic substances are decomposed into simpler substances when an electric current passes through them. for electrolysis to work, the ions must be free to move. |
| Oxidation |
Oxidation is any chemical reaction that involves the moving of electrons. Specifically, it means the substance gives away electrons is oxidised.
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| Neutralisation | Neutralisation occurs when a base is reacted with an acid. The OH- ions in the base react with the H+ ions in the acid to form H20, water. |
| Thermal decomposition |
Thermal decomposition is a process that causes a chemical compound to break down into simpler chemical compounds or elements under heat.
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| Which one: The bag gets cold because heat energy is given out to the surroundings. The bag gets cold because heat energy is taken in from the surroundings. The bag gets cold because plastic is a good insulator. | The bag gets cold because heat energy is taken in from the surroundings. |
| Which word best describes the change when ammonium nitrate dissolves in water. | Endothermic |
| Why is the ice pack shaken after the inner bag has burst. | To mix and spread the liquids and to make it dissolve faster. |
| The manganese(IV) oxide has lowered the... activation energy boiling point temperature | Activation energy |
| 27 Al 13 Number of Protons... Number of Neutrons... Number of Electrons... | Protons=13 Neutrons=14 Electrons=13 |
| Why is aluminium positioned in the group 3 of the periodic table? | It is in group 3 because it has 3 electrons in its outer shell. |
| Why does iodine have a higher boiling point than chlorine? Which one: Iodine is ionic and chlorine is covalent. Iodine is less reactive than chlorine. The covalent between iodine atoms are stronger.-the forces between iodine molecules are stronger. | The forces between iodine molecules are stronger. |
| Cl2(aq) + 2Kl(aq) --> l2 (aq) + 2KCl(aq) What us the colour of the final solution in this reaction? Brown Orange Pale Green Colourless | Brown |
| What is the ionic equation for the reaction of chlorine with potassium iodide? Cl2 + 2K --> 2KCl 2l- + Cl2 --> l2 + 2Cl- l- + Cl --> l + Cl- l- + K+ -> Kl | 2l- + Cl2 --> l2 + 2Cl- |
| Why does potassium iodide solution conduct electricity? It contains a metal. It contains electrons which can move. It contains ions which can move. It contains water. | It contains ions which can move. |
| What is the electron arrangement of a chlorine atom. | |
| State one property that makes aluminium more suitable then copper for overhead cables. | Because aluminium has a low density and copper is in the middle block of the periodic table whereas aluminium is in Group 3. |
| C2 Complete each sentence... The mass number of this nitrogen atom is... Atoms of nitrogen with different numbers of neutrons are called... Compared with a proton, the mass of an electron is... | 14 Isotope Very small |
| What is the correct formula of ammonia? | NH3 |
| Name the monomer used to make polymer poly(propene). | Ethane |
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