Front

What is combustion?

Back

Combustion is an exothermic process where a substance reacts with oxygen to release energy in the form of heat and light.

Front

What is the product formed when Lead Nitrate reacts with potassium iodide?

Back

The yellow precipitate formed is Lead Iodide (PbI₂).

Front

In the reaction @@Fe_2O_3 + 3CO ightarrow 2Fe + 3CO_2@@, what is the reducing agent?

Back

The reducing agent is Carbon Monoxide (CO).

Front

Which of the following is not a chemical reaction? A solid is dropped into a beaker of liquid and a gas is released. A liquid is heated in the sun and half of it evaporates. Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker. A solid is dropped into a beaker of liquid and an explosion occurs.

Back

A liquid is heated in the sun and half of it evaporates.

Front

What happens when an iron nail is dipped into copper sulphate solution?

Back

The color of the solution turns green, the blue color of the solution fades, and a reddish color appears on the iron nail.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is a reducing agent?

Back

A reducing agent is a substance that donates electrons in a chemical reaction, causing another substance to be reduced.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.