VR Tour For Std. 7 Ch. 6: Physical and Chemical Changes
What's Included in Virtual tour of this chapter
In a physical change, the chemical composition of a substance does not change. New substances are not created in a physical change. Chemical changes are complex changes that are mostly irreversible in nature. New substances are created in a chemical change. Iron is used in the making of bridges, ships, cars, truck bodies, and many other articles, and we see how rusting damages the iron. We will also learn that how metal is more reactive than the other reacts with the compound of less reactive metal, it replaces the less reactive metal in the compound and takes its place.
Virtual tour 1: Types of physical changes
Physical changes are simple changes that are mostly reversible in nature. In a physical change, the chemical composition of a substance does not change and it does not require a complex chemical procedure to come back to its original state. New substances are not created in a physical change.
Virtual tour 2: The Phase change of water: Melting, Evaporation, Condensation
We will take some ice and let it melt completely. This change will bring a difference in its state, that is, the ice will melt and form water. Then we will boil this water and collect its vapor. What will happen to the vapor collected from the flask of boiling water? Well, we will discover it in this virtual tour.
Virtual tour 3: A combustion of magnesium strip
We will perform an experiment with magnesium. When it is burnt, it reacts with oxygen and is found in the air to form magnesium oxide. In a chemical change, the chemical composition of a substance changes, and it requires a complex chemical procedure to come back to its original state.
Virtual tour 4: Rusting of Iron
In this virtual tour, we will understand the changes happening to iron on being exposed to moisture. The presence of both oxygen and moisture is essential for rusting. The higher the amount of moisture in the atmosphere, the faster is the rusting process.
Virtual tour 5: Reactivity of metals
We will learn about the reactivity of different metals. We will discover the action of metals on reacting with compounds of a less reactive nature. In the chemical reaction between copper sulfate and iron, the more reactive metal iron displaces the less reactive metal copper.