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www.chemactive.com GCSE CHEMISTRY RATES OF REACTION High Demand Questions QUESTIONSHEET 1 Calcium carbonate reacts with dilute hydrochloric acid to produce the gas carbon dioxide.
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chemactive.comwww.chemactive.com GCSE CHEMISTRY ATOMIC STRUCTURE & BONDING High Demand Questions QUESTIONSHEET 1 (a) Oxygen and sulphur are …
GCSE PHYSICS WAVES & SOUNDS - Chemactive.com
chemactive.comGCSE PHYSICS WAVES & SOUNDS High Demand Questions QUESTIONSHEET 3 (a) A man claps his hands on a hilltop. He hears the echo 0.7 s later. (i) If the speed of sound is 340 m/s, how far away was the surface from which the sound rebounded?
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chemactive.comwww.chemactive.com GCSE CHEMISTRY METALS & THE REACTIVITY SERIES ANSWERS AND MARK SCHEMES QUESTIONSHEET 10 (a) one per connection 3 (b) (i) potassium 1 (ii) magnesium/ iron 1
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chemactive.comwww.chemactive.com GCSE BIOLOGY BREATHING & RESPIRATION ANSWERS AND MARK SCHEMES QUESTIONSHEET 7 1. Inhaled air contains approximately 20% oxygen. ˜ 2. When we breathe in the diaphragm relaxes.
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