100086
| Questão | Responda |
| what is a precipitate? | An insoluble product |
| what does a number in front of a formula apply to? Ca + H2O --> Ca(OH)2 + H2 | how much of that atom/ element (what ever you wanna say) there is |
| what is the state symbol for 'dissolved in water' | 'aq' |
| Name the two main gases in the earth's atmosphere today | oxygen and nitrogen |
| Explain how today's atmosphere is different from today's atmosphere | Main gases today are oxygen and nitrogen, main gases then were carbon dioxide and water vapour |
| How were the oceans formed? | The water vapour condensed as the earth cooled to form the oceans |
| List 3 ways which human activity is changing the atmosphere | 1. burning fossil fuels 2. livestock farming 3. deforestation |
| Apart from humans, what else is changing the atmosphere | volcanic activity |
| How could you investigate the proportion of oxygen in the air? | 2 syringes, 1 tube, copper heated, air in tubes, oxygen taken up by copper forming copper oxide. make marks on syringes to see proportion of air |
| what are the three main types of rock | sedimentary, igneous, metamorphic |
| what type of rock is marble? | metamorphic |
| How is marble formed | Under enormous amounts of pressure and heat - limestone or chalk. |
| what type of rock is chalk | Sedimentary |
| What is the difference in the way that extrusive and intrusive rocks form? | Extrusive = cools quickly ABOVE ground, small crystals(e.g basalt and rhyolite) Intrusive = cool slowly UNDER ground, large crystals,(e.g granite, gabbro) |
| What is thermal decomposition? | The breaking down using heat |
| Write down (word equation for taylor) Symbol equation for the thermal decomposition of limestone. | calcium carbonate --> calcium oxide + carbon dioxide CaCO3 --> CaO + CO2 |
| how could you test for carbon dioxide in a thermal decomposition reaction | Bubble the gas through limewater (calcium hydroxide), if gas turns milky/cloudy... CO2 is your gas BABY! |
| What product is made by adding water to calcium oxide.... why is it useful? | calcium hydroxide - (a base is a metal hydroxide... :)) It neutralises acidic fields!! |
| Are atoms lost or just rearranged? | JUST rearranged.... (like me) |
| How well did you do? | AWFUL! TRY AGAIN! |
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