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goldkangaroo263Lv1

6 Oct 2020

Baking powder is a mixture of cream of tartar (KHC₄H₄O₆) and baking soda (NaHCO₃). When it is placed in an oven at typical baking temperatures (as part of a cake, for example), it undergoes the following reaction (CO₂ makes the cake rise):

You decide to make a cake one day, and the recipe calls for baking powder. Unfortunately, you have no baking powder. You do have cream of tartar and baking soda, so you use stoichiometry to figure out how much of each to mix.

The following choices, which is the best way to make baking powder? The amounts given in the choices are in teaspoons (that is, you will use a teaspoon to measure the baking soda and cream of tartar). Justify your choice.

Assume a teaspoon of cream of tartar has the same mass as a teaspoon of baking soda.

Add equal amounts of baking soda and cream of tartar.

Add a bit more than twice as much cream of tartar as baking soda.

Add a bit more than twice as much baking soda as cream of tartar.

Add more cream of tartar than baking soda, but not quite twice as much.

Add more baking soda than cream of tartar, but not quite twice as much.

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Patrick SuarezLv10

19 Dec 2020

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What would be the independent, dependent, and controlled(need 3 controlled variable) variables in this lab?

- what would be a good hypothesis?

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lb this lab we will be using our knowindge of stoicbiometry as well s the ideal gas law to calculate the amount of gas foemed in a chemical around-the-world balloos fights, they need to it is best for them to make these calculations before the flight rather during a chemical reaction. From this value, you can determine nation wen us the pere ent error. The ideal gas law can be used for many things For exampie, when hor air balloonists attempt caiculate how much gas they will have in thelr balloons at any time. Depending on the weight of than abruptly find out whilehalfway of the Indian Occan. During this lab, you will be determining the actual and peroent error of the reaction 1) Weigh out approximastely 5.0 g of NaHCO, (aka baking soda) on the balance. Record the exact amount of NaHCOs you 3) Pour the NaHCO, into a large deflated balloon using the plastic funnel When all of it 4) Very carefully place the balloon over the mouth of the flask, making sure that the meesured Pour 150 ml of IM HCI into a 250 ml Erlenmeyer flask make sure that all of it is in the main part of the balloon and none is in the opening has been added, tap the side of the balloon to NaHCO, does not fall into the flask. You may need pinches off the neck of the balloon to t0 to have one person stretching the mouth of the bailoon over the mouth of the flask while asodser p keep the powder from coming out Make sure that you're careful while doing this, because it will be easy for you t some of the acd on yourser while doing this. Wear safety goggles during this part of the lab, and if you splash acid on yourselt, make sure you wash it off with plenty of water 5) Once the balloon has placed over the mouth of the flask, have one person held it on so that it cannot fall off Once that person is ready and balloon is firmly fassened, another person should release all of the powder from the balloon inso the bydrochlonc lask You will immediately observe the forma on of bubbles a dor f an while the balloon inflates, the person holingä¼½ al should make sure that none of the gas escapes acid in the the balloon 6) When the reaction has stopped, take the balloon off the flask and tie off the end so it is closed. With a paper towel wipe off amy liqud which has splashed up into the nozzle oft eballon; this is very likely acadic, so make sure to wash your hands after touch ng 7 With a string and a ruler, find the circumference of the balloon in centimeters 8) Pour the solution into the waste container. Rinse flask 9) Repeat steps 1-8, but alter one variable Hypothesis As the pressure of Variables Independent-pressure h Dependent the amount of gas Cco) 3 Controlled-temperatureÂ·amount of HC, amoun4 of NaHCO3 Data: Table- Mea suremets for Baking Soda+ HCl Reaction Reaction 1 Reaction 2 Mass of sodium hydrogen carbonate ( Volume of hydrochloric acid ( Circumference of balloon( Barometric Pressure ( Temperature of Gas (

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3.Convert the numerical value of the density in question 2 from units of grams per cubic centimeter (g / cm3) to milligrams per milliliter (mg / mL). Note:

-there are 1000 milligrams in a gram.

-the volume unit cubic centimeter cm3 equals the milliliter mL.

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4.A finely-powdered white solid is known to be homogeneous mixture rather than a pure substance. A sample of this solid completely dissolves in water. Give TWO possible substances that could make up this solid mixture, and briefly explain your choices.

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