Question

please answer 4,5,6,7,8​

Answer 1

Hey mate !!

Here is ur Answer ⤵️

4 - When a zinc is Added to the dil. hydrochloric acid (HCL) , A displacement reaction takes place in which Zinc chloride is prepared and hydrogen gas is evolved. ii)→ HCl is highly corrosive in Nature , It stains human skin yellow and cause harms. Thus care must be taken while handling it.

5 - Difference Between Real Image and Virtual Image.

Real image -

1 - Real images are inverted.

2 - Convex lenses form a real image.

3 - Real images are formed on the screen.

4 - Real images are formed by a concave mirror.

5 - Real images are formed due to the actual. intersection of light rays.

Virtual Image -

1 - Virtual images are erect.

2 - Concave lenses form a virtual image.

3 - Virtual images appear to be on the lens or the mirror itself.

4 - Plane, convex mirror and concave lens form a virtual image.

5 - Virtual images are formed due to the imaginary intersection of light rays.

6 - Uses of concave mirrors:

1 - Concave mirrors are commonly used in torches, searchlights and headlights of vehicles to get powerful parallel beams of light.

2 - They are used as shaving mirrors to see a larger image of the face.

3 - Dentists use concave mirrors to view large images of the teeth of the patients.

7 - A balanced chemical equation gives the identity of the reactants and the products as well as the accurate number of molecules or moles of each that are consumed or produced.

8 - Quicklime is chemically Calcium Oxide. When water is added to Quick lime,calcium hydroxide is formed and a lot amount of heat is released in this process. A hissing sound is also observed.

THe reaction is,

CaO+H2O→Ca(OH) 2 +Heat

Hope it helps you ✌️

Thank you ❣️

@Love hunter