Topic 6 - Naming Compounds (Final)

Question 1

What is the prefix for 1 atom in molecular compounds?

Answer 1

Mono-

This prefix is used when there is only one atom of the first element.

Question 2

What is the prefix for 2 atoms in molecular compounds?

Answer 2

Di-

This prefix indicates that there are two atoms of the element.

Question 3

What is the prefix for 3 atoms in molecular compounds?

Answer 3

Tri-

This prefix signifies three atoms of the element.

Question 4

What is the prefix for 4 atoms in molecular compounds?

Answer 4

Tetra-

This prefix is used to denote four atoms of the element.

Question 5

What is the prefix for 5 atoms in molecular compounds?

Answer 5

Penta-

This prefix indicates five atoms of the element.

Question 6

What is the prefix for 6 atoms in molecular compounds?

Answer 6

Hexa-

This prefix signifies six atoms of the element.

Question 7

What is the prefix for 7 atoms in molecular compounds?

Answer 7

Hepta-

This prefix is used to denote seven atoms of the element.

Question 8

What is the prefix for 8 atoms in molecular compounds?

Answer 8

Octa-

This prefix indicates eight atoms of the element.

Question 9

What is the prefix for 9 atoms in molecular compounds?

Answer 9

Nona-

This prefix signifies nine atoms of the element.

Question 10

What is the prefix for 10 atoms in molecular compounds?

Answer 10

Deca-

This prefix is used to denote ten atoms of the element.

Question 11

What is the chemical formula for water?

Answer 11

H2O

Water is a common compound known for its essential role in life.

Question 12

What is the chemical formula for ammonia?

Answer 12

NH3

Ammonia is commonly used in fertilizers and cleaning products.

Question 13

What is the chemical formula for methane?

Answer 13

CH4

Methane is a primary component of natural gas.

Question 14

What is the chemical formula for propane?

Answer 14

C3H8

Propane is commonly used as a fuel for heating and cooking.

Question 15

What is the chemical formula for glucose?

Answer 15

C6H12O6

Glucose is a simple sugar that is an important energy source.

Question 16

What is the chemical formula for hydrogen peroxide?

Answer 16

H2O2

Hydrogen peroxide is often used as a disinfectant.

Question 17

What is the chemical formula for methanol?

Answer 17

CH3OH

Methanol is used as an industrial solvent and antifreeze.

Question 18

What is the chemical formula for ethanol?

Answer 18

C2H5OH

Ethanol is commonly found in alcoholic beverages.

Question 19

What is the difference between a chemical formula and a chemical name?

Answer 19

• Chemical Formula: Symbols and numbers identifying elements
• Chemical Name: What the element or compound is called

Every compound has both a chemical formula and a chemical name.

Question 20

What type of compound is formed when elements share electrons?

Answer 20

Molecular compound

Molecular compounds are often referred to as covalent compounds.

Question 21

What are the properties of molecular compounds?

Answer 21

• Can be gas, liquid, or solid at room temperature
• Solubility in water varies
• Low melting and boiling points
• Poor electrical conductivity

These properties are due to covalent bonding.

Question 22

How do you name a molecular compound?

Answer 22

Prefix + First Element + Prefix + Second Element (with ‘ide’ ending)

No prefix is used if there is only one of the first element.

Question 23

What is the ionic compound formed when a metal loses electrons to a non-metal?

Answer 23

Ionic compound

Ionic compounds are formed through the transfer of electrons.

Question 24

What are the properties of ionic compounds?

Answer 24

• Solid at room temperature
• High melting and boiling points
• Good solubility in water
• Good electrical conductivity

These properties result from ionic bonds.

Question 25

What is the naming convention for **ionic compounds**?

Answer 25

Metal name first, followed by non-metal name with 'ide' ending ## Footnote If the negative ion is a polyatomic ion, the name remains unchanged.

Question 26

What is the significance of **Roman numerals** in naming ionic compounds?

Answer 26

Indicates the charge of elements with more than one charge ## Footnote Example: Indium (III) Phosphide.

Question 27

What are the **7 diatomic elements**?

Answer 27

* N2 * O2 * F2 * Cl2 * Br2 * I2 * H2 ## Footnote These elements exist as pairs due to instability when isolated.

Question 28

What is the charge of **Iodine (I)**?

Answer 28

-1 charge ## Footnote Iodine has 53 protons and 54 electrons.

Question 29

What is the charge of **Vanadium (V)**?

Answer 29

+5 charge ## Footnote Vanadium has 23 protons and 18 electrons.

Question 30

What is the first step in converting a **chemical name** to a **chemical formula**?

Answer 30

Write the metal element’s symbol and ion charge, then the non-metal's symbol and ion charge ## Footnote This is essential for balancing the charges.

Question 31

What must the sum of the charges equal when forming an ionic compound?

Answer 31

Zero ## Footnote The positive ion must balance with the negative ion.