In the previous blogpost, i have introduced to you the Periodic Table which is a table that Chemists used to help them organise information. The Periodic Table is useful to Chemists because it can be used to predict the properties of an element based on its position in the Table.
In the YouTube video below, i will discuss on the Group VII Elements (commonly known as the Halogens) in terms of their Physical & Chemical Properties. I will also highlight to you what are the possible questions that examiners like to ask in Chemistry examinations.
Note: Colour of Iodine Solids is commonly stated to be Purplish-Black (in the video i mentioned it is Black in colour)
Hope you learned something important to UP your Chemistry grades and interests. Do try out the question that was posted at the end of the video. You can leave your comments/solutions in the Comments Section below. Adding a balanced chemical equation for that Halogen Displacement Reaction would show that you are cool!
If you think the concepts discussed are useful to your friends, feel free to forward this blog post to them.
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Chemical Bonding is an important topic to learn for Chemistry. In fact, fundamentally, it is one of the most important topic that is related to other topics in O-Level Chemistry (and equivalents).
There are 3 types of Bondings:
Ionic Bonding
Covalent Bonding
Metallic Bonding
Today, we will discuss a question on bonding that was sent by a Sec 4 O-Level Chemistry student. I reckon that the question was taken from his school’s preliminary examination paper.
Now, first we need to recognise that the substance is a covalent compound, meaning only covalent bonding exists in the molecule.
To recap, the element that is involved in bonding can have maximum of only 8 valence electrons (exception: Hydrogen with maximum of 2 valence electrons) around itself after bonding.
The 8 electrons can be bonded and can also be unbonded.
Answer is (B) i.e. X = Nitrogen; Y = Silicon and Z = Hydrogen
Reasons as follows:
Nitrogen is in Group V –> has 5 valence electrons –> 3 electrons used for covalent bonding + 2 unbonded valence electrons
Silicon is in Group IV –> has 4 valence electrons –> all 4 electrons are used for covalent bonding
Hydrogen has only 1 valence electron –> electron is used for covalent bonding
Hope you are learning something useful in this post.
PS: If you think this is beneficial to your friend, feel free to forward them this website. =)
