Reflection on topics taught in term 3

In term 3, we learnt reflection of light, ecology, and the carbon cycle. I must say that the topics taught in this term are relatively easy as most of us got good grades in the term 3 tests. For reflection of light, the angle of incidence is wqual to the angle of reflection and the distance of the object from the plane mirror is same as the distance of the image form the mirror. The image is virtual as no actual light rays are captured form the screen and is upright and laterall inverted. There is the diffused reflection and the specular reflection, the type of reflection formed depends on the direction of the reflected ray, the type of surface of the reflective object and the direction of the light source. For ecology, we learnt about the different types of organisms in a food web, such as autotrophs, heterotrophs and decomposers, and the different types of relatonships of organisms, such as commensalism and exploitative relationships. There are abiotic factors that affect the ecosystem such as humidity and wind speeds. For ecology we learnt the various ways of how carbon is recycled, for example, when forests are burnt in slash and burn cultivation, large amounts of carbon dioxide is released form the destroyed plant material.

Reflection on term 2 topics

In term 2, we learnt about balancing chemical equations, acids, salts and bases, and sexual reproduction. The objective of balancing chemical equations is to balance the number of elments on each side of the equation. In acids, salts and bases, we learnt about the different reactions between acids and bases, acids and metals, the different types of indicators, and many many more. In reproduction, we learnt about the features of the reproductive systems in humans and the menstrual cycle, and STDs. The subjects learnt in this term are really challenging as the balancing of chemical equations and reproduction is hard to understand. However, I think I can do well in them if I do more practice and pay attentionin class.

Reflection on topics learnt in term 1

Now let me reflect on the topics learnt in term 1. In term one, we learnt some basic chemistry for Sec 2, which includes how covalent bonding, ionic bonding, protons, neutrons, electrons, and the periodic table. We started off with making a large periodic table using a vanguard sheet and little sheets of paper. Now let me summarise what I learnt for the term:

Elements have protons(positive charge), neutrons(neutral) and electrons(negative charge). Covalent bonding the bonding between two atoms where they share electrons to achieve the electronic configuration of a noble gas, while ionic bonding is the bonding of metallic and non metalic elements and includes the transfer of electrons to be bonded. There is also metallic bonding mentioned, but we did not learn about it.