Write the chemical equations for the reactions of iron with steam and copper with dilute hydrochloric acid. Explain the observations.
Explain why hydrochloric acid reacts with zinc to produce hydrogen gas but does not react with copper.
What is a redox reaction? Give an example and explain which substance is oxidized and which is reduced.
The rearview mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rearview mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
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