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velikii [3]
3 years ago
6

Materials: • One disposable plastic cup • One disposable plastic spoon (plastic fork or knife may be used instead) • Thermometer

(if you have one) • Measuring cup and spoon • Newspaper (Use it to cover the countertop next to the kitchen sink. This could get a little messy!) Procedure: 1. Pick one of the following combinations to investigate in this activity. A. Vinegar and baking soda (NaHCO3) B. Room temperature water and powdered washing soda (Na2CO3) C. Vinegar and table salt (NaCl) 2. Measure two tablespoons of the appropriate powder (baking soda, washing soda, or table salt) and pour it into the clean, dry plastic cup. 3. Measure out one cup of the appropriate liquid (vinegar or water). 4. If you have a thermometer, place it in the measuring cup of liquid and write down the initial temperature. 5. Grasping the plastic cup near the bottom with one hand, pour the liquid into the plastic cup with your other hand. 6. Continue to grasp the cup as you stir the solution gently with the plastic spoon. Observe any temperature change felt through the plastic cup. 7. If you have a thermometer, record the temperature change as you stir the solution very gently. 8. When you are finished making observations, it is safe to pour the solution down the sink and to dispose of the cup and spoon in the trash. If you used a thermometer, be sure to wash it before putting it away.
Chemistry
1 answer:
Leya [2.2K]3 years ago
4 0
I'm not sure what the question is, this is a lab proecdure
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Millimeters, centimeters, meters, kilometers, Inches,<br> feet, and miles are all examples of
siniylev [52]

Answer:

Distance, some kind of distance or length.

Explanation:

 

4 0
3 years ago
What is the molarity of 0.26 mol of H2SO4 dissolved in 0.3 L of solution? *
irina1246 [14]

Answer:

A

Explanation:

molarity=moles of solute/liter of solution

molarity=0.26/0.3

molarity=0.87molar

7 0
3 years ago
A saturated solution of manganese(II) hydroxide was prepared, and an acid–base titration was performed to determine its KspKsp a
trapecia [35]

Answer:

10.945 x 10^-4

Explanation:

Balanced equation:

Mn(OH)2 +  2 HCl  -->  MnCl2  +  H2O

it takes 2 moles HCL for each mole Mn(OH)2

Next find the molarity of the Mn(OH)2 solution

= (1 mole Mn(OH)2 / 2 mole HCl)  X (0.0020 mole HCl / 1000ml) X (4.86 ml)    

= 4.86 x 10^-3 mole  

this is now dissolved in (70 + 4.86)  =  74.86 ml or 0.07486 L

thus [Mn(OH)2]  =  4.86 x 10^-3 mole / 0.07486 L  =  0.064921 M

Ksp =  [Mn2+][OH-]^2  =  4x^3  =  4(0.064921)^3  = 10.945 x 10^-4

6 0
3 years ago
Urea, (NH2)2CO, is a product of metabolism of proteins. An aqueous solution is 37.2% urea by mass and has a density of 1.032 g/m
Feliz [49]

Answer:

The molarity of urea in this solution is 6.39 M.

Explanation:

Molarity (M) is <em>the number of moles of solute in 1 L of solution</em>;  that is

molarity = moles of solute ÷ liters of solution

To calculate the molality, we need to know the number of moles of urea and the volume of solution in liters. We assume 100 grams of solution.

Our first step is to calculate the moles of urea in 100 grams of the solution,

using the molar mass a conversion factor. The total moles of 100g of a 37.2 percent by mass solution is

60.06 g/mol ÷ 37.2 g = 0.619 mol

Now we need to calculate the volume of 100 grams of solution, and we use density as a conversion factor.

1.032 g/mL ÷ 100 g = 96.9 mL

This solution contains 0.619 moles of urea in 96.9 mL of solution. To express it in molarity, we need to calculate the moles present in 1000 mL (1 L) of the solution.

0.619 mol/96.9 mL × 1000 mL= 6.39 M

Therefore, the molarity of the solution is 6.39 M.

4 0
3 years ago
Help plzzzzzzz ASAP!
Agata [3.3K]
I am going to say C. it has to do with the angles
8 0
3 years ago
Read 2 more answers
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