Explain the following:
Why do silver articles turn balckish while copper vessels turn greenish on keeping in air for a long time?

Give scientific reasons for the following: Copper vessels turn greenish and silver articles turn blackish when kept open in air for a long time.

Give scientific reasons: Lemon or tamarind is used for cleaning copper vessels turned greenish

Have you observed the following things ? Copper vessels not cleaned for a long time .

Explain the following: When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time, Why does this happen? Write the chemical equation.

Give scientific reasons: When copper articles exposed to air for a long time, gets corroded.

Answer the following questions: why do we fall sideways when we are sitting in a bus and it takes a sharp turn?

Use your brain power: Effect of speed and direction on velocity. Sachin is travelling on a motorbike. Explain what will happen in the following events during sachin's ride see figure. In case of a turning on the road, will the motorcycle, keeping its speed constant, what will be the effect on the velocity?

Give scientific reasons: When silver vessels exposed to air turns blackish after sometime.

Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. Why do we apply paint on iron articles?

Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. Do gold ornaments corrode? Justify.