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Good Evening dear candidates , Please today I’m going to teach you how to use calculator to solve all mathematics questions.

Today we will Commence our studies with Mathematics ❤️so get your Pens 🖊 and Jotters ready ⏱7pm

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What to observe? When dilute sulphuric acid is added to zinc granules, hydrogen gas is formed. The gas bubbles rise through the solution. When the burning match stick is brought near the mouth of the test tube the gas in the test tube burns with a ‘pop’ sound. This confirms that the gas evolved is hydrogen gas. From this experiment it can be said that dilute sulphuric acid reacts with zinc to produce hydrogen gas. A similar reaction is observed when we use other metals like iron. In general, it can be said that in such reactions metal displaces hydrogen from acids and hydrogen gas is released. The metal combines with the remaining part of the acid and forms a compound called a salt, thus, Acid + Metal ⎯→ Salt + Hydrogen gas LESSON HAS CULMINATED We will call it a Day ✍🏻

TITLE OF EXPERIMENT;[must be always stated] Experiment to study the reaction of diluted H2SO4 with zinc. / Experiment to show a reaction between an Acid & a Metal. The gas burns with a ‘pop’ sound when a burning match stick is brought near the mouth of the test tube.

What to do? 📌Add a few zinc granules in a test tube. 📌Add diluted sulphuric acid carefully along the sides of the test tube. Set the apparatus as shown in the image above ⬆️ 📌Bring a burning match stick near the mouth of the test tube

Reaction of Acids with Metals The reaction of acids with metals can be studied with the help of the following acitivity.[DIAGRAM] What is required? A test tube, zinc granules, dilute H2SO4, match box and a test tube holder.

Strong and Weak acids Acids are classified as strong and weak acids and their characteristics are classified above : 👆👆👆

All hydrogen containing compounds are not acids Although Ethyl alcohol (C2H5OH) and glucose (C6H12O6) contain hydrogen but do not produce H+ ion on dissolving in water. Their solutions do not conduct electricity and are not acidic.

3. Conduction of electricity and dissociation of acids. Do you know that solutions of acids in water (aqueous solutions) conduct electricity? Such solutions are commonly used in car and inverter batteries. When acids are dissolved in water they produce ions which help in conducting the electricity. This process is known as dissociation. More specifically, acids produce hydrogen ions (H+) which are responsible for all their characteristic properties. These ions do not exist as H+ in the solution but combine with water molecules as shown below:✍🏻👇 H+ + H2O ⎯→ H3O+ hydrogen ion hydronium ion The H3O+ ions are called hydronium ions. These ions are also represented as H+(aq).

2. Action on Indicators We have learnt earlier that indicators show different colours in presence of acids and bases. Let us recall the colours of the three commonly used indicators in presence of acids.