Sodium hydrogen carbonate (baking soda) decomposes upon heating to form carbon dioxide gas, water, and sodium carbonate. A crucible is a ceramic container that can be used for decomposition reactions since it can withstand high temperatures. To study the decomposition of sodium hydrogen carbonate, you would place a measured amount of sodium hydrogen carbonate in a crucible, heat over a bunsen burner for several minutes, and then mass the cooled product. The following data was collected during this reaction: Item

Mass (g)

Mass of Crucible

19.85

Crucible + NaHCO3

24.04

Crucible + Na2CO3

22.20

Mass of Na2CO3

?

A) Write the complete balanced equation (same rules as question 1)

--> + +

B) Calculate the mass of NaHCO3 used in the experiment: g

C) What is the Theoretical Yield of sodium carbonate (in grams)? g

D) Calculate the actual mass of the sodium carbonate? g

E) Calculate the % yield of the reaction. %

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a polar bond is formed when electrons are shared unevenly between atoms

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied