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Acid Reactions
| Question | Answer |
|---|---|
| Opposite of acid | Alkali |
| PH Scale | a measure of how acidic/alkali a substance is. Range goes from 0 - 14 - 7 being neutral. less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base or alkaline. |
| Neutral | Water and blood |
| UI | Universal indicator |
| alkali | opposite of acid - has a pH graeter that 7 |
| acid | opposite of alkali - has a lower pH than 7. |
| what is an example of an acid | examples: lemon juice, coca cola, vinegar, saliva, tea |
| what is an example of an alkali | examples: baking soda, drain cleaner, toothpaste |
| what is the regular pH of blood | 7.4 if it was higher than 7.6 or lower than 7.2 you would be very ill |
| what is ethanoic acid, and when is it useful or dangerous? | ethanoic acid is a very dangerous corrosive, it could give you terrible burns, it is safe when is it diluted, when it is known as vinegar |
| what must the pH of the soil be for carrots, cranberries, and sweetcorn? | carrots: 6 pH cranberries: 5 pH sweetcorn: 7.5 pH |
| Neutralisation | The chemical reaction that happens if you mix together an acid and a base |
| Indicator | a substance that changes colour when it is added to acidic or alkaline solutions |
| Bases | Alkali is a base. It is a base that dissolves in water. Not all bases are alkali but all alkali is base. |
| Bee stings | Bee stings are acidic. They can be neutralised using baking powder, which contains sodium hydrogen carbonate. |
| Table salt | Common table salt is sodium chloride |
| Chemical reaction | In a chemical reaction the atoms rearrange themselves and then join back together in a different way. |
| Can a chemical reaction be reversed? | It is very difficult to reverse a chemical reaction and get back the starting substances. |
| Useful chemical reactions | we can burn methane to help cook food and we can burn petrol to power vehicles. |
| Unhelpful chemical reactions | those that make food stale, or iron rusty. |
| Acid rain | Fossil fuels contain sulfur compounds. These produce sulfur dioxide, a gas with a sharp, choking smell, when burned. When sulfur dioxide dissolves in water droplets in clouds, it makes the rain more acidic than normal. This is called acid rain. |
| Test for hydrogen | burning splint held at the open end of a test tube of gas. If the gas is hydrogen it burns with a loud “squeaky pop” ( the result of the rapid combustion of hydrogen with oxygen to produce water.) |
| What can you add to zinc to make zinc sulphate | Zinc sulfate is produced by treating virtually any zinc-containing material (metal, minerals, oxides) with sulfuric acid. |
| Word equation (chemistry) | A word equation represents a chemical reaction using the names of the substances involved. Word equations do not show any chemical symbols or formulae. Use + and > rather than = |
| What salt would be made if zinc reacts with nitric acid? | Zinc nitrate |
| Improve a PH sensors results | Conduct Lab Calibration Services daily Make Sure the Sensor Is Always Hydrated. Prepare the New Electrode Make Sure that the Probe is Clean. |
Created by:
Frankiek
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