U8 Day 5-7 Entry CheckPoint Quiz

Time to review!!

Connecting everything we have learned!

• Have practice paper out or your notebook

• Calculator and Periodic table are NEEDED!

• Ask questions

• Correct your mistakes

Drag and Drop

The formula for calculating percent composition is mass of the ​

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divided by the mass of the ​

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times ​

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Drag these tiles and drop them in the correct blank above

element

compound

100

electron

proton

200

atom

300

gravity

bond

Multiple Choice

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

Fill in the Blanks

What is the mass of 0.75 moles of (NH₄)₃PO₄?

Use 2 numbers after the decimal for mass from the periodic table. Record to the correct number of sig figs and the unit.

N 3 x 14.01
H 12 x 1.01
P 1 x 30.97
O 4 x 16.00
149.09

​

Calculate the molar mass

Multiple Choice

What is the empirical formula for this compound?

• C₆H₂N₆O₃
• C₄HN₅O₁₀
• CH₃NO₂
• CH₅NO₃

Multiple Choice

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g.

• K₂SO₄ 
• K₈SO₁₆
• K₈S₄O₈ 
• K₈S₄O₁₆ 

Multiple Choice

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Drag and Drop

A chemist determines that 1.26 g of iron reacts with 0.54 g of oxygen to form rust. The percent composition of each element in the product is: ​

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% iron and ​

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% oxygen.

Drag these tiles and drop them in the correct blank above

70.0

30.0

3.4

2.23

42.9

57.1

Poll

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