Chemical Reactions and Equations Test - 16

Reactants are the starting materials in a chemical reaction. Reactants undergo a chemical change in which chemical bonds are broken and new ones formed to make products. Reactants are the basis of product formation and always opposite to the product.

Lead sulfate (PbSO₄) appears as a white crystalline solid Insoluble in water and sinks in water. Contact may irritate skin, eyes, and mucous membranes. It May be mildly toxic by ingestion, inhalation and skin absorption. Lead sulfate Used to make other chemicals. Use: in lithography, battery acid solution treated fabrics, used in varnishes

Formation of salt solution is not a chemical reaction.

In chemistry, a product is a substance that is formed as the result of a chemical reaction. In a reaction, starting materials called reactants interact with each other. After passing through a high energy transition state (achieving the activation energy for a reaction), the chemical bonds between the reactants are broken and rearranged to yield one or more products. Example of a product:-

Nitrogen gas and hydrogen gas are the reactants that react to form ammonia as a product:

N₂ + 3H₂ → 2NH₃

Combustion of (LPG) is a chemical change because when LPG comes out of cylinder and is converted from liquid to gaseous state it is a physical change. When the gas burns in air it is a chemical change.

All reactions is chemically balanced according to POAC (Principle of Analytical/atomic Chemistry) rule

Rusting is a type of Chemical Change. It results in the formation of Iron Oxide which is an entirely new substance. Ferric means the iron (III) ion Fe⁺³, and ferrous means iron (II), which is Fe⁺².

The copper rod (Cu) is dipped in iron sulphate (FeSO₄) solution and since Iron is more reactive than Copper

Cu + FeSO₄ → FeSO₄ + Cu

No reaction takes place.

Oxygen gas, like carbon dioxide, is a colorless, odorless gas that supports combustion. In other words oxygen supports burning.

Carbon dioxide is a very important gas. We use it in our cooking and in our soft drinks. Carbon dioxide is also used in fire extinguishers.

Hydrogen is a colorless and highly inflammable gas.

The given reaction (Cu + xHNO₃ → Cu(NO₃)₂ + yNO₂ + 2H₂O) is not balanced reaction so after put the value of x(4) and y(2) than the balanced reaction is Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O