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21 Cards in this Set
- Front
- Back
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evidence of chemical |
colour change solid forms gas/bubbles heat is produced/absorbed change of odor |
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chemical reactions involve... |
energy transfer and can be endo/exothermic |
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endothermic |
absorbs heat (feels cold) |
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exothermic |
releases heat (feels hot) |
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chemical reactions between elements... |
result in the formation of compounds |
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covalent vs ionic |
covalent bonds form when atoms share electrons - two non-metals ionic bonds form when atoms are held together by the attraction between opposite charges - metal and non metal |
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ammonia |
NH3 |
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Methane |
CH4^+ |
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hydroxide |
OH^- |
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nitrate |
NO3^- |
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carbonate |
CO3^2- |
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sulfate |
SO4^2- |
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Phosphate |
PO4^3- |
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Ammonium |
NH4^+ |
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combustion and respiration... |
types of chemical reactions that release energy but occur at different rates |
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factors affecting common chemical reactions |
temperature surface area concentration catalysts |
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acid eg. |
HCl H2SO4 |
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bases eg. |
NaOH NH3 Na2CO3 |
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acid properties |
A substance that releases Hydrogen ions (H+) intoan aqueous solution Corrosive Sour taste Turn blue litmus paper red React with some metals, releasing hydrogen gas andleaving behind a salt Conduct electricity Are neautralised by bases, producing water and asalt |
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base properties |
Release polyatomic ions of hydroxide OH^- Strong bases produce lots of ions in solution, weakbases produce less When dissolved in water, also called an alkali Caustic Soapy/slimy feel Turn red litmus paper blue Bitter taste Conduct electricity Neutralised by acids, producing water and a salt |
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law of conservation of mass |
mass cannot be created or destroyed |
