Question

Solve the following crossword puzzle.

Across

1. A compound can be conveniently written as

5. Written on right hand side of a chemical reaction

Down

2. Written on the left-hand side of a chemical equation

3. Melting of ice forms

4. An element is written as

Answer 1

Across

1. A compound can be conveniently written as: formula.

• The chemical formula is generally known as a symbolic representation of its chemical composition.
• It provides insight into the elements that constitute the molecules of a compound
• It also defines the ratio in which the atoms of these elements combine to form such molecules.
• For example, the chemical formula of water is ${\mathrm{H}}_2\mathrm{O}$

5. Written on the right-hand side of a chemical reaction: product

Chemical reaction: A chemical reaction is when the bonds are broken within reactant molecules, and new bonds are formed within product molecules to create a new substance.

• The substances that are present on the right side of a chemical reaction are known as products.
• For example, In reaction $\underset{\mathrm{Hydrogen}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to 2\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$, water is the product.

Down

2. Written on the left-hand side of a chemical equation: reactant

• The substances that are present on the left side of a chemical reaction are known as reactants.
• For example, In reaction $\underset{\mathrm{Hydrogen}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to 2\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$, Hydrogen and Oxygen are the reactants.

3. Melting of ice forms: Water

• As the melting of ice takes place it results in the formation of water.
• It is a type of physical change.

4. An element is written as: symbol

• An element can be written in form of a symbol.
• The symbol of an element is either the first letter or the first and another letter of the English or Latin name of the element.
• For example symbol of the element, Oxygen is represented as $\mathrm{O}$.