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

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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. %

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

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