Tarantula Dissection

Stoichimetry f a Precipitation Reaction

 

Stoichiometry of a Precipitation Reaction

 

 

Questions

 

A.    From your balanced equation what is the theoretical yield of your product?
I got

 

B.    According to your data table, what is the actual yield of the product?
64.6g

 

C.    A perfect percent yield would be 100%. Based on your results, comment on your degree of accuracy and suggest possible sources of error.

Possible sources of error could be occurring in the weigh boat.

 

D.    How could these errors be reduced in the future?

Use the water to make the weigh boat clean and thereby getting all into the mixture.

Physical & Chemical Properties

Substance: Mg

Color: red-brown

Odor: metallic

Effect of Heat: crunched

Litmus test: solid

Substance: Cu

Color: reddish brown

Odor: metallic

Effect of Heat: holes developed

Litmus test: purple

Substance: Zn

Color: silvery

Odor: metallic

Effect of Heat: develops holes and steams

Litmus test: purple

Substance: NaCl

Color: opaque white

Odor: salty

QUESTIONS:

A - Did you observer any chemical changes in this experiment?
yes

B - What evidence did you use to decide that something was a chemical change?
element and reactions

 

C - Give at least two examples of chemical changes you observed.
steaming, formations

D - Classify the following properties of sodium metal as physical or chemical:

            Silver metallic color – physical

            Turns gray in air – chemical

            Melts at 98^oC - physical

            Reacts explosively with chlorine - chemical

E - Classify the following changes as physical or chemical:

            Water freezes at O^oC - physical

            Baking soda when combined with vinegar produces bubbles:- chemical

            Mothballs gradually disappear at room temperature – physical

            Ice cubes in a freezer get smaller with time – physical

            Baking soda loses mass as it is heated – chemical

            Tarnishing of silver – physical

F - How would you show that dissolving table salt is a physical change?

            Dehydrate the solution

Fermentation of Ginger Ale

In the past few weeks, we've made ginger ale. 

Start by making a ginger bug: 

Ingedients: 1 fresh ginger root, 1/2 cup white granulated sugar, two cups of water, and a quart sized mason jar

Instructions:

1) Slice a 1.5 inch long ginger root piece and peel the root grate it to make grated ginger.

2) Put the grated ginger in the mason jar and add sugar in the equivalent amount.

3) Add the two cups of water.

4) Put a breathable lid on the jar.

5) Daily for five days, add a tablespoon of both the sugar and the grated ginger.

6) After adding, stir it in with a nonmetal spoon, and cover.

7) The culture can be verified active if bubbles form at the top and it fizzes.

8) Do not allow the culture to cross contaminate.

Now start the actual ginger ale part:

Ingredients: 2 in. piece of fresh minced ginger root, ½ cup sugar, 1 tbs molasses,1/2 cup lemon juice, 8 cups of filtered water, ½ tsp of sea salt.

Instructions:

1) Make a ginger wort by boiling 3 cups of water, the minced ginger root, sugar, molasses, and salt in a saucepan.

2) Let the mixture simmer for five or so minutes as long as the sugar is entirely dissolved.

3) Remove the mixture from heat and add the water, then allow it to cool to room temperature.

4) Add lemon juice to the mixture.

5) Place the mixture in the 2 quart jar and tightly place the lid after stirring the mixture.

6) Set it on the counter for two or three days for the carbonation and fermentation to set it.

7) Strain the mixture before drinking it.

Our Experience:

The ginger can become overbearing but is better when refrigerated. This come out to be more flavorful than store-bought.

Credit to: Wellness Mama for the recipes.

Properties of Gases

Questions

A.   Give two reasons why we fill the gas generator test tubes almost to the top with chemicals.

B.   What happens to the zinc in the hydrogen generation experiment?

Darkening of metal

C.   What happens to the manganese in the oxygen generation experiment?

Melding of separate bits

D.   Write a balanced equation for the reaction between O₂ and H₂.

O₂+2H₂=H₂O

E.   What is the function/purpose of the bromthymol blue in the CO₂ experiment?

The color changes in presence of solutions

F.    Bromothymol blue is blue in the presence of basic solutions, and yellow in the presence of acidic solutions. If your solution is a murky green, what might you assume about the solution?

Neutral

G.   Make a table of the gases studied. Tabulate their colors, the effect on lighted or glowing splints, and other properties one might use to identify them.

Sample table:

Gas	Flame reaction	Glowing splint	Limewater reaction	Bromthymol blue react.
Hydrogen		NA	NA	NA
Oxygen			NA	NA
Hydrogen & oxygen		NA	NA	NA
Carbon dioxide		NA
Alka Seltzer	NA
Breath	NA

Measurements Lab

Length measurements

Object	Object Length (cm)	Length (mm)
Science CD	12	120
Laptop Trackpad	9	90
Alexia’s Invitation	14	140

Temperature measurements

Hot water from tap (ºC )	Boiling water (ºC)	Boiling water-5 minutes(ºC)
37.78
Cold water from tap (ºC)	Ice water (ºC)	Ice water-5 minutes (ºC)

 Could not complete the tests because there was an issue with our items.

Volume Measurements

Test tube volume (mL)	Number of drops in 1 mL	Pipet volume (mL)
11mL	3	3

Mass Measurements

Object	Estimated Mass (g)	Actual Mass (g)
Stirring Stick	15	11.1
Favourite Pencil	10	8.3
End Roll of Cast Tape	5	6.7
Metal Burn Plate	35	42.2
Wireless Mouse	100	93.9
Silver Nitrate Bottle	5	7.1
Mobile Phone	125	91.5

Density Measurements

	Mass A	Mass B	A-B
Object	Cylinder+Substance	Cylinder	Substance	Volume	Density(M/V)
Water	21.4g	16.6g	4.8g	5mL	0.96g/mL
Rubbing Alcohol	21.4g	16.6g	4.8g	5mL	0.96g/mL
Salt Solution	22.4g	16.6g	5.8g	5mL	1.16g/mL

Calorimeter

How many calories does it take to raise the temperature of one gram of water by one degree?

We will determine calorie content of varying foods using a homemade calorimeter.

Procedure:

1.       Measure 25 g of each substance.

2.       Measure out 100 g of water.

3.       Grab all materials.

4.       Make chart.

5.       Light food aflame.
6. Record Data.

Ocean Creatures	25	19	22	3
Chocolate Cremes	24	22	22		-1
Swirly Gummy Bears	25	22	22
Potato Chips	24	22	32	10	-1
Sweet Potato Chips	13	35	53	18	-12
Tortilla Chips	14	33	64	31	-11
Sunflower Seeds	28	27	35	8	+3
Pumpkin Seeds	24	32	34	2	-1
Roundy Crackers	27	34	34		+2
Pita Chips	21	31	55	24	-4
Peaches	25	33
Mangos	25	33
Orange Sugar Wafers	26	33	39	6	+1
Nilla Wafers	26	35
Marshmallows	23	22	32	10	-2

Observations:

Ocean Creatures	Flame died out a lot
Chocolate Cremes	Refused to light aflame
Swirly Gummy Bears	Inflammable
Potato Chips	Flickered in and out of flame
Sweet Potato Chips	Crazy good burn
Tortilla Chips	Flame quickly
Sunflower Seeds	Died out quickly and consistently
Pumpkin Seeds	Inflammable
Roundy Crackers	Char better than they burn
Pita Chips	Quick and awesome burn
Peaches	Inflammable
Mangos	Inflammable
Orange Sugar Wafers	Edges burnt very well
Nilla Wafers	Inflammable
Marshmallows	Crispy and yummy looking

Calculations for those that could be done:

Ocean Creatures	(100g)(3C)=300g/C
Potato Chips	(100g)(10C)=1000g/C
Sweet Potato Chips	(100g)(18C)=1800g/C
Tortilla Chips	(100g)(31C)=3100g/C
Sunflower Seeds	(100g)(8C)=800g/C
Pumpkin Seeds	(100g)(2C)=200g/C
Pita Chips	(100g)(24C)=2400g/C
Marshmallows	(100g)(10C)=1000g/C