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Rusting – O Level Chemistry

In this post, we’ll look at what is rusting, the conditions needed for rust to be formed, and how to protect iron from rusting.

Properties of Metals

In this post, we’ll look at some common properties of metals, and explain the chemistry reason behind them. These properties include why pure metals are soft, why they are good conductors of electricity, and why they have relatively high melting and boiling point.

Reactivity Series and Reactions of Metals

In this post, we’ll look at the reactivity series of metals (tested in the O Level exam), and then have a look at some of…

Separation Techniques

In Chemistry, separation techniques are methods used to separate and purify components from a mixture. Some common separation techniques include: filtration, chromatography, distillation, crystallization,

Correlation and Linear Regression

In this post, we’ll look at correlation and linear regression as tested in H2 A Level Math section on statistics. Here, you’ll what is correlation, regression, product moment correlation coefficient (r), how to use the graphic calculator Ti84 to do a least square regression.

Hypothesis Testing

In this post, you’ll learn how to do a hypothesis testing for mean, using both the p-test method and the z-test (test statistics) method.

Sampling

In this post, we’ll look at common concepts tested in sampling for H2 A Level Math, which include types of samples, central limit theorem, … …

Normal Distribution

In this post, we’ll look at common concepts tested in normal distribution for H2 A Level Math.

Binomial Distribution

A binomial distribution is a probability distribution that describes the number of successes in a given number of independent trials. The conditions needed for a…

Discrete Random Variables (DRV)

A discrete random variable is one that takes discrete value e.g. 1, 2.4, 3, etc. For example, if a discrete random variable, X, represents the number shown on a dice, then X can only take … ….

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