Empirical and Molecular Formula Reteach

Avery, Samuel, and Hannah are in a chemistry class. Their teacher asked them to identify the formula with the lowest whole # ratio of elements in a compound. What is this formula called?

• Molecular Formula

• Chemical Formula

• Empirical Formula 

• Distance Formula

Zoe, Abigail, and James are studying chemistry together. They come across a compound with the formula Si₂F₆. They start debating about the empirical formula of this compound. Can you help them?

• SiF

• Si₂F₆

• SiF₃

• Si₆F₂

Michael, Henry, and Noah are working on a chemistry project. They came across a compound with the molecular formula N₂S₃. They are trying to determine the empirical formula of this compound. What would it be?

• NS

• N₃S₂

• N₂S₃

• N₁S_1.5

Tags

NGSS.MS-PS1-1

Henry, Samuel, and Maya were studying chemistry together. They came across a compound C₂F₆ and started discussing its empirical formula. Can you help them choose the correct empirical formula?

• CF

• C₂F₆

• C₆F₂

• CF₃

Tags

NGSS.MS-PS1-1

Liam, Grace, and Olivia are studying chemistry together. They come across a chemical formula that shows the actual number and kinds of atoms present in one molecule of a compound. They are unsure what this is called. Can you help them identify it?

• ionic formula

• covalent formula

• empirical formula

• molecular formula

Ethan is baking a cake and he sees a recipe that calls for 2H₂O. He knows that the subscript in the chemical formula represents something. What does it represent?
 

• The big number that tells you the number of cakes Ethan needs to bake.

• The atomic number

• The little number that tells the number of atoms for each element.

Tags

NGSS.MS-PS1-1

Grace, Nora, and Avery are studying chemistry. They come across the molecule CO₂ and wonder how many "C" are in it. Can you help them?

• 2

• 1

• 0

• 3

Tags

NGSS.MS-PS1-1

Abigail, Ethan, and Noah are working on a chemistry project. They are studying a molecule of a certain type of fat. They found that the molecule is represented as C₁₈H₃₄O₃. Can you help them figure out how many Carbon "C" atoms are in this molecule?

• 18

• 34

• 3

• 37

Tags

NGSS.MS-PS1-1

In a chemistry class, Avery, Oliver, and Sophia were given different pairs of compounds and asked to identify which pair has the same empirical formula. Can you help them find the correct pair?

• NaCrO₄ and Na₂Cr₂O₇

• C₂H₄O₂ and C₆H₁₂O₆

• C₃H₆O₃ and C₂H₆O₂

• CH₄ and C₂H₆

Michael, Arjun, and Abigail are studying chemistry together. They came across a sugar molecule and found out that its empirical formula is CH₂O and the molecular molar mass is 180.18. Can you help them figure out the molecular formula of the sugar molecule?

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

Tags

NGSS.HS-LS1-6