氧化物相关
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696
| Word | Definition | Topic |
|---|---|---|
| base | A substance with a pH higher than 7, and which has a high concentration of hydroxyl ions. Bases react with acids to form a salt and water (called neutralisation). Metal hydroxides, oxides and carbonates are all bases. | Useful products from air |
| catalyst | A catalyst changes the rate of a chemical reaction without being changed by the reaction itself. | Useful products from air |
| compound | A compound is a substance formed by the chemical union (involving bond formation) of two or more elements. | Useful products from air |
| cracking | Cracking is the breaking down of large hydrocarbon molecules into smaller, more useful hydrocarbon molecules by vapourizing them and passing them over a hot catalyst. | Useful products from air |
| equilibrium | If the rate of the forward reaction and the rate of the back reaction in a reversible reaction are equal, the reaction is in equilibrium. | Useful products from air |
| eutrophication | Eutrophication is the enrichment of a water body with nutrients - such as nitrates - which results in excessive growth of algae and other aquatic plants, leading to depletion of oxygen. | Useful products from air |
| exothermic | Heat energy is released in an exothermic reaction. We know this because the surroundings get warm. | Useful products from air |
| liquefy | To liquefy means to become liquid, for example through heating a solid or cooling a gas. | Useful products from air |
| molecule | A molecule is a collection of two or more atoms held together by chemical bonds. It is the smallest part of a substance that displays the properties of the substance. | Useful products from air |
| neutralisation | Neutralisation is the reaction between an acid and a base to form a salt plus water. | Useful products from air |
| oxidation | Oxidation is a reaction in which oxygen combines with a substance. Oxidation also means a loss of electrons. | Useful products from air |
| product | A product is a substance formed in a chemical reaction. | Useful products from air |
| reactant | A reactant is a substance put together with another substance/substances to undergo a chemical reaction. | Useful products from air |
| reversible reactions | Reversible reactions are chemical reactions which can go both ways. The direction of the reaction depends on the condition of the reactants. | Useful products from air |
