Hydrates

Na₂CO₃ · 10H₂O is known as sodium carbonate ______

• Hydroxide
• Hydrate
• Decahydrate
• None of the above

Name the following hydrate:  NaCl * 5H₂O

• sodium chloride 
• sodium monochloride pentahydrate
• sodium chloride pentahydrate
• pentahydrate

A compound is a hydrate when it...

• is composed of only hydrogen and oxygen
• is a state of water
• contains water in the compound

• repels water from the compound

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.
• is the actual formula of a molecular compound.

• a relationship between an empirical formula and its molecular formula.

What is the correct formula for sodium oxide?

• NaO
• NaO₂
• Na₂O
• Na₂O₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is an empirical formula? 

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

What is the basic ratio that gives the lowest whole number ratio of the atoms of the elements in a compound called?

• Empirical formula

• Molecular formula

• Mole ratio

• Hydrate formula

What is a simple whole number multiple of an empirical formula called?

• Empirical formula

• Molecular formula

• Mole ratio

• Hydrate formula

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

• Add up the mass of protons and neutrons, then divide by two.

• Divide the mass of the element by the total mass of the compound and multiply by 100.

• Add up the atomic masses of the elements, then divide by the number of the elements.

• Find the relative mass of any atom by adding the number of protons to the number of neutrons, then dividing by that total number.

What information can you obtain from an empirical formula?

• Number of atoms in a compound

• Number of moles in a compound

• Mole ratio in a compound

• Names of elements in a compound