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| A change in which a new substance(s) is formed e.g. a bicycle rusting |
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| A change in which no new substance(s) is formed e.g. boiling water |
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| A form of energy that is released (given out) or absorbed (taken in) during chemical reactions (and physical changes). |
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| A chemical reaction (or physical change) that releases (gives out) energy to the surroundings (usually in the form of heat-causing the temperature to increase (go up)). |
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| A chemical reaction (or physical change) that absorbs (takes in) energy from the surroundings (usually in the form of heat-causing the temperature to decrease (go down)). |
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| Used to measure temperature |
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| How hot or cold something is. Measured in degrees Celsius (oC). |
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| = total ÷ number of numbers added up |
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| = final temperature - start temperature |
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| When a substance reacts with oxygen to release heat and light. As energy is released this is an example of an exothermic reaction. |
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| Measures how acidic or alkaline/basic as solution is. |
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| A solution with pH below 7. |
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| A solution with pH above 7. |
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| When an acid reacts with a alkali/base. |
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| Used to identify different gases. |
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| A burning splint goes "pop" |
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| A glowing splint relights |
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| test for carbon dioxide gas |
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Definition
| Turns lime water from clear to cloudy.. |
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| Total mass of the reactants = total mass of the products |
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| How readily/easily a substance undergoes a chemical reaction |
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| When a single compound breaks down into two or more simpler substances. Usually this requires an input of energy so is endothermic. |
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| The chemical(s) at the start of a chemical reaction. Found on the left-hand side of an equation. |
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| The new substance(s) formed during a chemical reaction. Found on the right-hand side of the equation. |
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Use of words to show the reactants and the products during a chemical reaction, for example:
magnesium + oxygen --> magnesium oxide |
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