Chemical Reactions and Equations

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
A chemical equation represents a .

A is a reaction where two or more reactants combine to form a single product.

Reactions in which heat is released along with the formation of products are called chemical reactions.

The decomposition of vegetable matter into compost is also an example of an reaction.

A is a type of chemical reaction in which one reactant yields two or more products.

Calcium oxide is also called .

When a decomposition reaction is carried out by heating, it is called decomposition.

Reactions in which energy is absorbed are known as reactions.

is a chemical reaction in which a more reactive element displaces a less reactive element from its compound.

reaction is a type of chemical reaction where two compounds react, and the positive ions and the negative ions of the two reactants switch places, forming two new compounds or products.

Any reaction that produces a precipitate can be called a .

is the loss of electrons or an increase in the oxidation state of an atom by another atom, an ion, or a molecule.

is the gain of electrons or a decrease in the oxidation state of an atom by another atom, an ion, or a molecule.

is a process through which metals in manufactured states return to their natural oxidation states.

When the substance containing oils and fats are exposed to air they get oxidised and become rancid due to which their smell, taste and colour change. This process is known as .

When an element displaces another element from its compound, a reaction occurs.

Two different atoms or groups of atoms (ions) are exchanged in reactions.

reactions produce insoluble salts