Introduction: Considering the beneficial properties of plants, not only to us, but the environment as well, it is important to understand the nature of Allelopathy and how it affects plant ecology. According to the Topics in Biology Laboratory Manuel, allelopathy refers to “the beneficial or harmful effects of one plant on another plant, by the […]
An acid is a group of chemicals. Acids are positively charged ions, they are liquid and are solutions of pure compounds in water. If you want to know if something is an acid, you can test it by using litmus paper. Acids will turn litmus paper red, whilst alkalis will turn it blue. Alkalis are […]
Freire implies that teachers are only telling students what to know rather than conversting with them, which explains why Freire insists that “education is suffering from narration sickness”(Freire 71). This means that he believes that educators only fill student’s minds with information, that the teacher feels is important, without providing the students the meaning and […]
The equivalence point is characterized by a sharp change of pH which can be followed with a pHmeter. A graph of pH versus concentration will indicate the molar equivalence at the inflexion point of the curve. The point observed experimentally is never exactly the molar equivalence but a “best estimate” and is given the name […]
The crucible is weighed and the exact mass is recorded. Approximately 0.2g of zinc is placed into the crucible and the crucible with its contain is weighed. The exact mass of zinc is determined.3)10 ml of 6M HCl solution is poured into a measuring cylinder. The 10 ml of 6M HCl solution is carefully added into the crucible containing zinc powder and the contents is stirred gently using a glass rod. A vigorous chemical […]
Did you observer any chemical changes in this experiment? Yes What evidence did you use to decide that something was a chemical change? I observed during the application of the hydrochloric acid to some of the substances bubbling, and smoking Give at least two examples of chemical changes you observed. Green changed from blue to […]