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| Word | Definition | Topic |
|---|---|---|
| alloy | An alloy is a compound of two or more elements, at least one of which is a metal. | Useful products from rocks |
| anode | An anodes is the electrode (electrical conductor) attached to the positive terminal of a battery. | Useful products from rocks |
| atom | All elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons. | Useful products from rocks |
| brittle | If something is brittle it is easily broken. | Useful products from rocks |
| catalyst | A catalyst changes the rate of a chemical reaction without being changed by the reaction itself. | Useful products from rocks |
| cathode | A cathodes is the electrode (electrical conductor) attached to the negative terminal of a battery. | Useful products from rocks |
| compound | A compound is a substance formed by the chemical union (involving bond formation) of two or more elements. | Useful products from rocks |
| corrode | To deteriorate (get weaker) due to the action of water, air, or an acid. | Useful products from rocks |
| crust | The crust is the outermost layer of the Earth. | Useful products from rocks |
| decompose | If a substance decomposes, it breaks down into simpler compounds or elements. | Useful products from rocks |
| displacement reactions | Displacement reactions happen when a more-reactive element replaces a less-reactive element in a compound. | Useful products from rocks |
| electrode | Electrodes are conductors used to establish electrical contact with a circuit. The electrode attached to the negative terminal of a battery is called a negative electrode, or cathode. The electrode attached to the positive terminal of a battery is the positive electrode, or anode. | Useful products from rocks |
| electrolysis | Electrolysis is the decomposition (separation or break-down) of a compound using an electric current. | Useful products from rocks |
| electrolyte | An electrolyte is a substance which in solution will conduct an electric current. | Useful products from rocks |
| electron | An electron is a very small negatively-charged particle found in an atom in the space surrounding the nucleus. | Useful products from rocks |
| element | All atoms of an element have the same atomic number, the same number of protons and electrons and so the same chemical properties. | Useful products from rocks |
| exothermic | Heat energy is released in an exothermic reaction. We know this because the surroundings get warm. | Useful products from rocks |
| ions | Charged particles formed by loss or gain of electrons. When atoms lose an electron they become a positive ion. When they gain an electron they become a negative ion. | Useful products from rocks |
| ionic substances | Ionic substances form when a metal reacts with a non-metal. They contain charged particles called ions. | Useful products from rocks |
| malleable | If a material is malleable it is capable of being hammered or pressed out of shape without being likely to break or return to the original shape. | Useful products from rocks |
| molten | Molten means reduced to liquid form by heating. It is mainly used to describe rock, glass or metal. | Useful products from rocks |
| ore | An ore is a rock containing enough quantities of a mineral that it is profitable to extract it. | Useful products from rocks |
| oxidation | Oxidation is a reaction in which oxygen combines with a substance. Oxidation also means a loss of electrons. | Useful products from rocks |
| product | A product is a substance formed in a chemical reaction. | Useful products from rocks |
| reduction | Reduction is a reaction in which oxygen is removed from a substance. Reduction also means a gain in electrons. | Useful products from rocks |
| slag | Slag is the non-metallic by-product resulting from the extraction of metals such as iron from their ores. | Useful products from rocks |
| sterilize | To sterilize means to make something free from micro-organisms such as bacteria. | Useful products from rocks |
| thermal decomposition | A reaction in which substances are broken down by heat. | Useful products from rocks |
