S2 Unit 7 Week 1 Homework (Due 01-12-2024)

Front

What is a hydrate?

Back

A hydrate is a compound that contains water molecules within its structure, typically represented as a solid with a specific number of water molecules attached.

Front

How do you determine the formula of a hydrate?

Back

To determine the formula of a hydrate, calculate the mass of water lost upon heating, then use the molar mass of the anhydrous compound and the molar mass of water to find the ratio of water to the compound.

Front

What is the molar mass of water (H₂O)?

Back

The molar mass of water is approximately 18 g/mol.

Front

What is the significance of the percentage mass loss in hydrates?

Back

The percentage mass loss indicates the amount of water in the hydrate, which helps in determining its formula.

Front

What is the difference between ionic and molecular compounds?

Back

Ionic compounds are formed from the electrostatic attraction between ions, while molecular compounds are formed from covalent bonds between atoms.

Front

How do you name ionic compounds?

Back

Ionic compounds are named by stating the cation (positive ion) first, followed by the anion (negative ion), with the anion's name often ending in '-ide' or '-ate'.

Front

What is the formula for Iron (III) hydroxide?

Back

The formula for Iron (III) hydroxide is Fe(OH)₃.

Front

How do you calculate the percentage by mass of an element in a compound?

Back

To calculate the percentage by mass of an element, divide the total mass of the element in the compound by the molar mass of the compound, then multiply by 100.

Front

What is the percentage by mass of fluorine in sulfur hexafluoride (SF₆)?

Back

The percentage by mass of fluorine in SF₆ is approximately 78.0%.

Front

What is the formula for diphosphorus pentoxide?

Back

The formula for diphosphorus pentoxide is P₂O₅.