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7E Reactions
Simple chemical reactions @ AJHS NZ
| Question | Answer |
|---|---|
| acetic acid | The old name for ethanoic acid. It is the acid in vinegar. |
| acid rain | Rain containing sulphuric and nitric acid. |
| acid | A substance that turns litmus red. It has a pH of less than 7. |
| alkali | Substance that turns litmus blue. Has a pH of more than 7. |
| antacid | A medicine containing an alkali used to cancel out some of the acid in the stomach to treat heartburn. |
| ascorbic acid | Chemical name for vitamin C. |
| carbon dioxide | A gas which will put out a lighted splint and turn limewater milky. |
| chemical energy | The kind of energy stored in chemicals. |
| chemical reaction | A change where new substances are formed. |
| citric acid | The acid in citrus fruits. |
| combination reaction | When chemicals join to form new substances. |
| combustion | The scientific word for burning. |
| corrosion | When stone or metal reacts with chemicals in air or water and is worn away or changed into a different substance. |
| corrosive | Substances that attack metals, stonework and skin are called corrosive. |
| dilute | We dilute a solution by adding more of the solvent to it. |
| ethanoic acid | The acid in vinegar. |
| fuel | A chemical that can release energy when it reacts. |
| gas | Something made of particles that are very spread out and have no bonds between them. |
| harmful | Another word for irritant. |
| hydrocarbon | A chemical compound containing only hydrogen and carbon. |
| hydrochloric acid | A common acid that is also found in your stomach. |
| hydrogen | A gas which is given off when metals react with acids. It burns with a squeaky pop. |
| indicator | A dye that will change colour in acids and alkalis. |
| irreversible action | A reaction in which what you end up with cannot be turned back into what you started with. |
| irreversible change | Permanent change. |
| irritant | Something that irritates the skin and eyes. |
| limewater | A chemical that goes cloudy when carbon dioxide is bubbled through it. |
| litmus | A simple kind of indicator. It turns red in acids and blue in alkalis. |
| neutral | Substance that is not an acid or an alkali. Has a pH of 7. |
| neutralisation | When something is neutralised. |
| neutralise | When an acid is added to a base (or alkali) a neutral substance is produced. |
| nitric acid | A common acid. |
| oxide | A compound that includes oxygen. |
| permanent change | A change in which what you ended up with cannot be turned back into what you started with. |
| pH scale | A numbered scale from 1–14 showing the strengths of acids and alkalis. Numbers below 7 are acids. Numbers above 7 are alkalis. pH 7 is neutral. |
| physical change | A change where no new substances are formed. |
| product | New chemical formed in a chemical reaction. |
| reactants | Chemicals that join together to form a new substance. |
| reversible change | A change in which what you end up with can easily be turned back into what you started with. |
| rust | Substance formed when iron or steel reacts with oxygen and water. |
| sulphuric acid | A common acid. Used in car batteries. |
| sweetener | A substance that makes things taste sweeter. Sugar is a natural sweetener. |
| universal indicator | A mixture of indicators giving a different colour depending on how weak or strong an acid or alkali is. |
| word equation | A way of writing out what happens in a chemical reaction. |
Created by:
johncl
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