Tech Dexing

Moles and Avogadro’s number made easier. 🧪📚

Chemistry becomes easier when a tutor explains the concept step by step instead of asking students to simply memorise it.

In this lesson, our TechDexing tutor explains:

• What a mole means in Chemistry
• What Avogadro’s number represents
• How 1 mole = 6.02 × 10²³ particles
• How this idea helps us understand the number of atoms, molecules or particles in a substance

The goal is simple: understand the concept first, then use the formula.

📚 This is how TechDexing’s 1-on-1 online tutoring helps IGCSE, O Level and A Level students understand difficult Chemistry topics step by step.

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Should, Could, or Would? 🤔 Which one fits the sentence?

These three words look similar, but they are used in different situations.

In this video here is Quick way to remember

Understanding how these words work can help students write and speak more accurately in IGCSE, O Level and A Level English.

📚 Need help improving English grammar and communication? TechDexing offers 1-on-1 online English tutoring.

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Why does sugar disappear in water, but chalk doesn’t? 🧪💧

You put both in water.

The sugar seems to disappear.
The chalk doesn’t.

So what’s actually happening?

Sugar dissolves in water. Its particles spread throughout the water, so you can’t see them anymore.

Chalk doesn’t dissolve. Its solid particles stay in the water and eventually settle at the bottom.

So remember:

Dissolving doesn’t mean disappearing. 👀

The substance is still there. Its particles are just spread throughout the solution.

This simple idea helps explain solubility, solutions and mixtures in Chemistry.

Studying IGCSE, O Level or A Level Chemistry?

TechDexing offers 1-on-1 online tutoring to help students understand concepts clearly.

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Probability looks complicated until you know what to count.

In this Maths lesson, students work through probability questions using a standard deck of 52 playing cards.

The lesson covers questions such as:

• Probability of selecting a red card
• Probability of selecting a black card
• Probability of selecting a heart or spade
• Probability of selecting a king
• Probability of selecting an ace or jack
• Probability involving combinations such as an even red card

The key idea is simple:

Probability = Number of favourable outcomes ÷ Total number of possible outcomes

Using real examples like playing cards makes probability easier to understand and apply in exam questions.

📚 Preparing for IGCSE, O Level or A Level Maths? TechDexing provides 1-on-1 online tutoring with personalised lessons.

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Sugar + water… mixture or solution?

They’re actually both.

Here’s the simple difference:

• A mixture contains two or more substances that are not chemically combined.
• When sugar dissolves in water, sugar is the solute and water is the solvent.
• The result is called a solution.
• So, a solution is a type of mixture.

💡 Remember:
Every solution is a mixture, but not every mixture is a solution.

A small distinction like this can make Chemistry questions much easier to understand in IGCSE, O Level and A Level.

📚 Need help with Chemistry or other subjects?
TechDexing provides 1-on-1 online tutoring with personalised lessons.

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Why does alcohol boil before water?

It comes down to how strongly the particles attract each other.

Quick check:
Stronger forces between particles → higher boiling point.

A simple idea like this can help students understand questions about boiling points, particle attraction and intermolecular forces instead of simply memorising values.

Preparing for IGCSE, O Level or A Level Chemistry? TechDexing provides personalised 1-on-1 online tutoring to help students understand concepts clearly.

🎓 Book your FREE Demo Class