Unit 4 Test Review 💯

Front

What is the empirical formula for a compound with the molecular formula C4H6?

Back

C2H3

Front

What is the correct formula for lithium oxide?

Back

Li2O

Front

What is the name of the hydrate NaCl * 5H2O?

Back

Sodium chloride pentahydrate

Front

What is a formula with the lowest whole number ratio of elements in a compound called?

Back

Empirical Formula

Front

How do you calculate the composition of water in a hydrate?

Back

(Mass of water / Mass of hydrate) * 100%

Front

What is the mass of water in a hydrate if the hydrate weighs 4.4 grams and the anhydrous compound weighs 3.3 grams?

Back

1.1 grams

Front

What is the percentage of water in a hydrate if the mass of water is 1.1 grams and the total mass of the hydrate is 4.4 grams?

Back

25%

Front

Define 'hydrate' in chemistry.

Back

A compound that contains water molecules within its structure.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formula shows the simplest ratio of elements, while molecular formula shows the actual number of atoms in a molecule.

Front

What is the formula for calculating the percentage composition of an element in a compound?

Back

(Mass of element in 1 mole of compound / Molar mass of compound) * 100%