Unit 7 - The Mole Test Review

The mass of each element divided by the total mass of the compound is called

• mole

• molar mass

• empirical formula

• percent composition

The simplest whole-number ratio of the atoms of the elements in a compound is given by the

• empirical formula

• molar mass

• molecular formula

• percent composition

What is the empirical formula of H₂O₂?

• HO

• H₂O

• HO₂

• H₄O₂

Mark all correct answers. Which of the following would be molecular formulas of C₂H₃?

• C₆H₉

• CH

• C₃H₂

• C₄H₆

What is the empirical formula for substance 3.

• C₄H₈

• CH₂

• CH

• C₂H₄

Tags

NGSS.HS-PS1-3

Which of the following is true about the three substances?

• They all have the same empirical formula

• They all have the same molecular formula

• Substance 1 and 3 have the same empirical formula

• Substances 1 and 3 have the same molecular formula

Which substance has the smallest molar mass?

• NaCl

• Cl₂

• CH₂

• CO

Which one has the most particles?

• 1 mole of Ca

• 1 mole of H₂

• 1 mole of He

• They all have the same amount of particles

What is the empirical formula for this molecular formula CH₂OHCH₂OH?

• A) CHO

• B) C₂H₅O₂

• C) CH₃O

• D) C₂H₆O₂

What is the molecular formula of this molecule?

• CH₂

• CH

• CH₃

• C₂H₆

Tags

NGSS.HS-PS1-7