1) If we cut away part of a solid, let's say an ice, does that mean that some of the molecules are also cut out together in the sliced part?
2) Can pure salt be obtained from a salt solution by crystallisation?
3) Lactic acid is produced during the process of anaerobatic respiration while hydrochloric acid is mixed with proteases to form gastric juice. The term "acid" brings a negative impression to me and I sometimes wonder if there are situations where such acids in our body can be harmful to us.
4) Is a micrometer screw gauge is as accurate as everyone thinks?Concepts in which I was unclear of at the start of the learning process
1) The difference between egestion and excretion
2) The difference between evaporation to dryness and crystallisation.
3) The difference between respiration and breathing
4) Breathing in plants
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